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2020-4-1 · The influence of nozzle lip geometry on the Strouhal number of the self-excited waterjet is studied. Jets emanating from the self-excited nozzle with various lip parameters are investigated in a high pressure cell with Reynolds number 3 × 10 5 and 4 cavitation numbers (0.04, 0.06, 0.08, 0.1). Strouhal numbers are obtained from the pressure oscillation measured by a transducer.
Get Price2018-1-1 · So, studies about synthetic jet in air mainly concern the velocity distribution and mass flux at the nozzle. On the other hand, synthetic jet underwater is mainly used for propulsion. Thrust is the main concern. Like synthetic jet in air, the geometrical parameters will also have a great effect on the thrust and efficiency of synthetic jet ...
Get Price2003-2-1 · Influences of nozzle flow and nozzle geometry on the shape and size of an air core in a hollow cone swirl nozzle M R Halder, S K Dash, and S K Som Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 2003 217 : 2 , 207-217
Get Price1996-9-1 · Experiments were conducted to determine the effect of nozzle geometry (diameter and aspect ratio) on the local heat transfer coefficients from a small heat source to a normally impinging, axisymmetric, submerged and confined liquid jet of FC-77. A single jet with nozzle diameters in the range of 0.79–6.35 mm and up to seven different nozzle ...
Get Price2017-4-2 · The effect of nozzle configuration on the jet flow field is discussed with predicted mean flow and turbulent flow data. Near-field of multiple jets shows the nonlinear behavior. Multiple jets show better performance in the near-field based on entrainment, secondary flows, and …
Get Price2012-10-1 · Simulations and experiments were performed to examine: (1) the influence of increasing air pressure inside the melt blowing die (P inlet) on the air jet in a typical melt blowing process and (2) the influence of a Laval nozzle (a converging–diverging nozzle) on the air jet. The baseline case without a nozzle was simulated and examined based ...
Get PriceA chapter on the performance of supersonic dash nozzles follows, since these nozzles have similar design problems, Finally, the nozzle test facilities used at NASA-Lewis during this nozzle ...
Get Price2011-6-1 · The influence of the nozzle position and effect of the air boundary have also been addressed . In a recent work Morgan et al. [12] used computational fluid dynamics and experimental techniques to show that achievable useful flowrate depends on wheel characteristics and grinding parameters (porosity and speed) whereas real useful flowrate is ...
Get Price2010-11-1 · 1. Introduction. This paper describes the effect of injector geometry on the performance of an internally mixed injector. The objective of this effort is to develop a fuel injector whose spray properties could be varied in a controlled fashion to accommodate various operating conditions , .For example, it may be desirable to keep the mean droplet size constant while varying the fuel flow rate ...
Get PriceThe shroud air was radially discharged inward across the nozzle face to avoid the contamination of the nozzle tip. Jet A-1 fuel was used as the working fluid. ... the nozzle performance …
Get PriceA chapter on the performance of supersonic dash nozzles follows, since these nozzles have similar design problems, Finally, the nozzle test facilities used at NASA-Lewis during this nozzle ...
Get PriceRequest PDF | Effect of Nozzle Exit Area on the Performance of a Turbojet Engine | The thrust produced by a gas turbine engine can be optimized by suitably changing the nozzle geometry in ...
Get PriceIn this paper, a CFD model calibrated by the experimental results from initial designed ejector is used to evaluate the influence of 6 key geometry parameters on the performance (entrainment ratio) of an air-cooled ejector cooling system and, consequently, to find the best design parameters. A new ejector according to the findings from the CFD simulation is then designed and used at the same ...
Get Price2020-9-16 · Pressure swirl nozzle is widely adopted in various kinds of power equipment such as rocket engine, aircraft engine and gas turbine due to its simple structure, good atomization performance, and low cost. 1 Sauter mean diameter (SMD), droplet velocity and spray cone angle are the key parameters of the pressure swirl nozzle which reflects the quality of droplet generation, transport and ...
Get Price2021-8-8 · The characterization of flow through Pelton hydro turbines allows the optimization of their operation and maximization of energy performance. The flow in the injector of Pelton turbines and in the free jet area (the area from the injector outlet surface to the runner bucket inlet surface) is influenced by several parameters: the geometry of injector components (nozzle and injector spear), the ...
Get Price2021-4-19 · The structural parameter of spiral groove has a great influence to spiral-grooved thrust bearing. Unsuitable value of spiral groove will lead to the poor hydrodynamic performance of spiral-grooved thrust bearing, namely vibration, wear and impact contact. This study proposes a new computational model and conducts the performance …
Get Price2021-2-12 · The model used in the present investigation is an annular contoured plug nozzle, which is mounted in the supersonic free jet facility [26, 27].The plug contour is designed by Angelino’s approximate method for plug nozzle design [] for an exit Mach number of 1.8 at NPR (=) 5.75.The flow exiting the internal nozzle is inclined at 26.6 degrees to the x-axis, which is based on the Prandtl ...
Get Price2012-5-23 · The influence of nozzle chamber structure and partial-arc admission on the erosion characteristics of solid particles in the control stage of a supercritical steam turbine Energy, Vol. 82 Nanolayered CrAlTiN and multilayered CrAlTiN–AlTiN coatings for solid particle erosion protection
Get PriceThe increasing velocity of the air leaving the outer nozzle (Fig. 2, P 1) causes an air pressure drop at the center of the jet (Fig. 2, P atm), thus creating a driving force that is responsible for the acceleration of the polymer solution [9, 19]. The polymer solution and the gas jet are brought together via independent delivery mechanisms.
Get PriceThe cough of a COVID-19 infected subject contaminates a large volume of surrounding air with coronavirus due to the entrainment of surrounding air in the jet-like flow …
Get Price2019-4-15 · Spray chamber geometry was modified to yield three different chamber height-to-diameter ratios and two different nozzle stand-off distances. Sprays from three nozzles, two single-hole nozzles with different diameter and one twin-hole nozzle (THN), were examined for two injection pressures of 100 MPa and 150 MPa into two chamber pressures of 0.1 ...
Get Price2014-12-24 · The paper presents the results of an investigation on the aerodynamic performance of a full coverage film-cooled nozzle guide vane. The blading is a typical high pressure turbine vane of advanced design, working in the high subsonic regime.
Get Price2017-3-8 · Influence of Key Structural Parameters of Combustion Chamber on the Performance of Diesel Engine ... Effect of Nozzle and Combustion Chamber Geometry on the Performance of a Diesel Engine Operated on Dual Fuel Mode Using Renewable Fuels ... Parametric Analysis of Piston Bowl Geometry and Injection Nozzle Configuration Using 3D CFD and DoE,” SAE.
Get Price2011-9-26 · In order to enhance the aggressive intensity of a cavitating jet for practical applications, the effect of the geometry of the nozzle through which the jet is driven on the aggressive intensity was investigated. The nozzle under test was cylindrical and consisted …
Get Price2010-2-16 · The performance of Co-flow fluidic thrust vectoring is a function of secondary flow characteristics and the fluidic nozzle geometry. In terms of nozzle geometry, wall shape and the secondary slot aspect ratio are the main parameters that control the vector angle. The present study aims to find a high quality wall shape to achieve the best ...
Get Price2021-2-24 · It is our great pleasure to welcome you to the 2020 11 th Asia Conference on Mechanical and Aerospace Engineering (ACMAE) on December 25-27 th, 2020, which is planned to held in Chengdu, China.However, due to the spread of COVID-19, many countries have strict restrictions to travel aboard; Meanwhile, the safety of the participants is always the priority.
Get Price2020-5-11 · sieve, the air jet sieve is the device of choice for sieving fine powders. This is where the air jet sieve e200 LS develops maximum effectiveness. Not just one, but two compo-nents work together here: a slotted nozzle which rotates inside the sieving chamber and an industrial vacuum cleaner connected up to the sieving chamber.
Get PriceThree kinds of nozzles normally used in industrial production are numerically simulated, and the structure of nozzle with the best jetting performance out of the three nozzles is optimized. The R 90 nozzle displays the most optimal jetting properties, including the smooth transition of the nozzle’s inner surface. Simulation results of all sample nozzles in this study show that the helix ...
Get Price2014-6-19 · This paper proposes an orthogonal analysis method for decoupling the multiple nozzle geometrical parameters of microthrusters, thus an reconfigured design can be implemented to generate a proper thrust. In this method, the effects of various nozzle geometrical parameters, including throat width W t , half convergence angle θ in , half divergence angle θ out , exit-to-throat section ratio W e ...
Get Price2010-12-22 · Numerical Investigation of the Influence of Real World Blade Profile Variations on the Aerodynamic Performance of Transonic Nozzle Guide Vanes J. Turbomach (March,2012) Surface Heat Transfer Fluctuations on a Turbine Rotor Blade Due to Upstream Shock Wave Passing
Get PriceThe first is jet formation at the nozzle itself, including the influence of shape, size, and geometry of the nozzle. As the jet emerges from the nozzle, it thickens due to due to resistance from, and entrainment of, surrounding liquid as shown in Fig. 5(a). Jet thickening influences both the size of the impingement zone and spatial variation of ...
Get Price2018-10-21 · Preface. The 5th AMMSE 2018 is the 2018 5th International Conference on Advanced Materials, Mechanics and Structural Engineering (5th AMMSE 2018) took place in Seoul, South Korea, on October 19-21, 2018.
Get Price2014-6-19 · This paper proposes an orthogonal analysis method for decoupling the multiple nozzle geometrical parameters of microthrusters, thus an reconfigured design can be implemented to generate a proper thrust. In this method, the effects of various nozzle geometrical parameters, including throat width W t , half convergence angle θ in , half divergence angle θ out , exit-to-throat section ratio W e ...
Get Price2017-12-6 · The performance scaling characteristics observed between various physical device configurations is discussed; included is the influence of mass flow rate, air injection area ratio and nozzle area ratio. The impact of geometry on the unsteady nature of rotating detonation engines and the combustors’ efficient production of thrust is presented ...
Get Price2015-3-1 · This paper investigates the effects of the combustion chamber geometry and spray angle on the air-fuel mixing and emissions formation of a DI diesel engine. A new quantitative factor measuring the air-fuel mixing quality has been adopted in order to analyze and compare air …
Get PriceMultiphase jet machining (MJM) is a recently developed surface texturing method based on which a mixture of abrasives and water is accelerated by compressed air to …
Get PriceIn this study, the influence of the swirling air outlet geometry is evaluated relative to the effect on the flow field structures and the patterns of droplet dispersion. This is accomplished by comparing the continuous-phase (air in the presence of a spray) and dispersed-phase (droplets) behavior downstream of the swirl cup assembly outfitted ...
Get Price2018-10-9 · All five balls had one of their regular hexagons facing the oncoming air (see orientation in Figure 3) to ensure that the balls were oriented in the same way in the wind tunnel. Because all the balls have a traditional 32-panel surface structure, the surface texture …
Get Price2020-6-3 · The test was conducted under constant pressure (∼ 1.4 MPa) and Δt = 800 ms, 128 ml water was jetted out of the nozzle. This is equivalent to an average jet speed of 32.6 m s-1 (We ∼ 36,478 ...
Get Price2012-5-23 · Influence of wall roughness on boundary layer transition position of the sonic nozzles Measurement, Vol. 139 Investigation of effects of convergence and divergence half-angles on the performance of a nozzle for different operating conditions
Get Price2012-8-6 · Influence of the Excitation Frequency and Orifice Geometry on the Fluid Flow and Heat Transfer Characteristics of Synthetic Jet Actuators 27 August 2019 | Fluid Dynamics, Vol. 54, No. 4 Performance Enhancement of a Multiresonant Piezoelectric Energy Harvester for …
Get Priceevaluated with regard to engine performance and emissions. Finally, the influence of the injector ... one specific spray hole of an injector nozzle is oriented perpendicular to a deflection plate that is placed in close proximity to the nozzle orifice. Assuming that the jet will be deflected radially from the spray axis when fuel is injected, a ...
Get Price2020-5-11 · sieve, the air jet sieve is the device of choice for sieving fine powders. This is where the air jet sieve e200 LS develops maximum effectiveness. Not just one, but two compo-nents work together here: a slotted nozzle which rotates inside the sieving chamber and an industrial vacuum cleaner connected up to the sieving chamber.
Get Price2013-6-4 · The material performance requirements can be divided into 5 broad categories: • Functional requirements • Processability requirements • Cost • Reliability requirements • Resistance to service conditions Materials and Process Selection for Engineering Design: Mahmoud Farag 8. Creating alternative solutions Having specified the material ...
Get Price2012-5-23 · Effect of Nozzle Temperature on the Performance of a 1 kW H 2 -N 2 Arcjet Thruster. 8 September 2010 | Plasma Science and Technology, Vol. 12, No. 4 ... Influence of magnetic field and discharge voltage on the acceleration layer features in a Hall effect thruster. ... Multi-Jet Effects of Micro-Nozzle Array in Very Low-Power DC Micro-Arcjets.
Get Price2018-9-11 · Nozzles on the print heads can jet two types of photosensitive polymers namely VeroWhitePlus TM RGD835 (rigid polymer) and TangoPlus FLX930 (elastomer-like material) in varying proportions. A UV ...
Get PriceThis paper presents results of computational fluid dynamic (CFD) analysis and experimental investigation of an ejector refrigeration system using methanol as the working fluid. The CFD modelling was used to investigate the effect of the relative position of the primary nozzle exit within the mixing chamber on the performance of the ejector. The results of the CFD were used to obtain the ...
Get Price2015-4-7 · The effects of air and liquid properties, and atomizer dimensions, on the spray characteristics of plain-jet airblast atomizers are examined. Mean drop size and drop-size distribution are measured using an improved form of light scattering technique.
Get Price2019-10-4 · The influence of air pressure, polymer concentration, and flow rate on the fibers properties was investigated and revealed that surface roughness was controlled by a combination of air pressure ...
Get Price2020-10-13 · A study is presented on the influence of air flow rate and surface geometry on the thermal-hydraulic performance of commercial tube-fin ‘no-frost’ evaporators. A specially constructed wind-tunnel calorimeter was used in the experiments from which data on the overall thermal conductance, pressure drop, Colburn j-factor and Darcy friction
Get Price2020-9-3 · Abstract: The fuel injector nozzle is critical to the performance and emissions of diesel engines.Some of the important injector nozzle parameters—including details of the injector seat, the injector sac and nozzle hole size and geometry—affect the combustion characteristics of the diesel engine, as well as the stability of the emissions and performance …
Get Price2014-6-24 · In this paper we study two cold atmospheric pressure plasma jets, operating in Ar + 2% air, with a different electrode geometry but with the same power dissipated in the plasma. The density profiles of the biomedically active NO and O species throughout the plasma jet, previously obtained by laser diagnostics, are calculated by means of a zero ...
Get Price2017-6-2 · A review on nozzle wear in abrasive water jet machining application H. Syazwani1, G. Mebrahitom, A. Azmir 1Faculty of Manufacturing Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia . E-mail :[email protected], [email protected], [email protected] . Abstract.This paper discusses a review on nozzle wear in abrasive water jet …
Get Price2014-11-24 · The effect of end-plates on the performance of aircraft wings was studied in early aeronautics (e.g. [1, 2]) and its positive influence has been recognized for at least a half century . Classical end plates are simply vertical plates fitted to wing tips.
Get Price2019-10-14 · Another important compromise was that the Reynolds number Re = U j D/ν simulated was reduced to be in the 0.1 to 5 × 10 5 range in most of these early jet studies , where U j is the jet velocity and D is the nozzle exit diameter. Without nozzle geometry, there was no high-Reynolds number wall-bounded flow to consider.
Get PriceMach 2 jet from a convergent-divergent elliptical nozzle, of aspect ratio 2, has been controlled with limiting flat and arc tabs. The mixing promoting capability of the flat and arc tabs were studied in the presence of different levels of pressure gradient, at the nozzle exit, corresponding to nozzle pressure ratios of 4 to 8, in steps of one.
Get PriceDissertations & Theses from 2019. Krishnan, Ankita (2019) Understanding Autism Spectrum Disorder Through a Cultural Lens: Perspectives, Stigma, and Cultural Values among Asians . Suzuki, Takakuni (2019) Quantifying the Relations among Neurophysiological Responses, Dimensional Psychopathology, and Personality Traits . Dissertations & Theses from 2018. Abdel-Salam, Ahmed Nabil (2018) …
Get Price2020-6-5 · The nozzle height to nozzle diameter ratio H/D agrees well to the one used in tempering. The Reynolds number Re = VD/v, where V is the flow speed, D is the nozzle diameter and is the kinematic viscosity of air, is roughly half of the one used in the tempering process. It can be seen that CFD predicts the heat transfer with good accuracy.
Get Price2021-6-6 · Sprues，runners, and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. While it is true that those plastic materials may be reused in the form of regrind, their presence nevertheless means a reduction in the performance …
Get Price2021-2-16 · nozzle vanes adjustable. This allows the turbine’s flow area, and therefore its mass flow, to be optimized, practically with-out losses, at every point on the engine’s load profile. As a result, the supply of air or air/fuel mixture to the engine can be matched exactly to all loads and ambient conditions. A proven technology
Get Price2020-10-13 · performance. However, the heat exchanger performance often can be limited by the air-side, because the air-side heat transfer coefficients are naturally very lower than the liquid or two-phase side. So, many active and passive methods are developed to improve the air-side energy performance and reduce heat exchanger volume and manufacturing costs.
Get Pricegeometry on engine performance and emissions. The effect of combustion chamber shape on the engine performance is very complex due to its influence on the flow field and the air-spray interaction and the results in literature confirm that it is difficult to define an optimized combustion chamber, because of the influence of engine
Get Price2014-10-24 · A new nozzle system for the efficient production of multi-layered nanofibers through electrospinning is reported. Developed a decade ago, the commonly used coaxial nozzle system consisting of two ...
Get Price2012-5-22 · Three-Dimensional CST Parameterization Method Applied in Aircraft Aeroelastic Analysis. International Journal of Aerospace Engineering, Vol. 2017. A fully automated framework for helicopter rotor blades design and analysis including aerodynamics, structure, and manufacturing.
Get Price2012-5-23 · 25 June 2019 | Materials Performance and Characterization, Vol. 8, No. 5 The Influence of Process Parameters and Build Orientation on the Creep Behaviour of a Laser Powder Bed Fused Ni-based Superalloy for Aerospace Applications
Get Price2015-12-8 · Also shown is an image of an assembled nozzle (b) with the tip indicated by a dashed box. A rendering of an x-ray tomogram of this tip shows details of the internal geometry of a nozzle where the jet is formed (c). The nozzle components in this image are labeled in the same scheme as described for (a).
Get PriceAbstract. When water issues under high pressure from a circular orifice in a thin plate, a jet is formed whose section, though diminished in area, retains the circular form. But if the orifice be not circular, the section of the jet undergoes remarkable transformations, which were elaborately investigated by Bidone, many years ago.
Get Price2012-5-23 · Influence of lobe geometry on mixing and heat release characteristics of solid fuel rocket scramjet combustor. ... Numerical investigation of improving the performance of a single expansion ramp nozzle at off-design conditions by secondary injection. Acta Astronautica, Vol. 133 ... A free-jet experimental study on the performance of a cavity ...
Get Price2021-6-6 · Sprues，runners, and gates fulfill the function of conveying the plastics melt from the nozzle of the injection unit to the individual cavities. While it is true that those plastic materials may be reused in the form of regrind, their presence nevertheless means a reduction in the performance …
Get Priceaffect ORVR performance are: • geometry of nozzle spout with regards to fit in the vehicle fillneck • air-entrained by nozzle • shut-off response On a broader scale, the refueling process for all vehicles involves a dynamic response in both the vehicle and the dispenser nozzle. Together, the vehicle and nozzle form a system in which each ...
Get Price2021-8-13 · The orifice, nozzle and venturi flow rate meters use the Bernoulli Equation to calculate fluid flow rate using pressure difference through obstructions in the flow. In a flow metering device based on the Bernoulli Equation the downstream pressure after …
Get PriceChegg Solution Manuals are written by vetted Chegg experts, and rated by students - so you know you're getting high quality answers. Solutions Manuals are available for thousands of the most popular college and high school textbooks in subjects such as Math, Science ( Physics, Chemistry, Biology ), Engineering ( Mechanical, Electrical, Civil ...
Get PriceThe compressed air flows into the center passage of the drill tool through the suction nozzles and the flushing nozzles. The air enters the suction nozzles, where it forms jets with high flow velocity; some air adjacent will be entrained into the jets due to the jet‐pump effect, resulting in a negative pressure zone in a vicinity of the jets.
Get Price2018-1-1 · Microfluidic chips provide unparalleled control over droplets and jets, which have advanced all natural sciences. However, microfluidic applications could be vastly expanded by increasing the per-channel throughput and directly exploiting the output of chips for rapid additive manufacturing. We unlock these features with in-air microfluidics…
Get Price2020-2-13 · AIR FORCE SYSTEMS COMMAND ARNOLD AIR FORCE STATION, TENNESSEE 37389 ... 4.5 Influence of NAB Geometry on Reynolds Number Effects 21 4.6 Influence of Variable Tunnel Wall Porosity on CD p 29 ... number on the performance of nozzle afterbodies, the effects can best be …
Get Price2008-9-19 · Exceptional mixing was also observed with increased standoff. Back-pressure was shown to increase with increasing standoff and decreasing tab angle, but was not affected by mixing-tube diameter. In addition, a zone of recirculation was identified at the entrance to the mixing-tube. This zone is thought to have an influence on ejector performance.
Get Price2021-7-20 · The atomizer was operated over a wide range of aerodynamic jet Weber number, We g (in the range 40–140), while the jet momentum flux ratio (MFR) and overall air to liquid mass flow ratio (ALR) varied moderately in the range 3–6 and 9–14, respectively. The size and three-component velocity of droplets were measured at various axial and ...
Get Price2012-8-17 · Numerical simulation of Monte Carlo ion transport at atmospheric pressure within improved air amplifier geometry 28 June 2014 | International Journal for Ion Mobility Spectrometry, Vol. 17, No. 3-4 Multislope MUSCL method applied to solve shallow water equations
Get PriceAn experimental analysis of the slot film cooling performance downstream of a mixing jet has been performed. The mixing jet was blown into the main flow at a position five jet diameters downstream of the slot exit. Flow visualizations of the jet and of the cooling film are presented for blowing rates of 1 and 2 with jet momentum rates of 7 and 10.
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