Optimal Performance and Geometry of Supersonic Ejector

Hewedy, N. I. I.; Hamed, Mofreh H.; Abou-Taleb, F. Sh.; Ghonim, Tarek

doi:10.1115/1.2903742

Cited by 20 publications

(9 citation statements)

References 7 publications

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“…where Re is the particle's Reynolds number. The dynamic differential equation [24] of wheat seed in the stable accelerating zone III is expressed as the following equation:…”

Section: A Description Of Wheat Pneumatic Seeding Devicementioning

confidence: 99%

“…Using the equations (24) and (2)(3), the wheat speed and the actual steady airflow velocity were 56 m/s and 681 m/s for the optimized device, respectively. The actual steady airflow velocity was approximately 5.2% lower than the simulation result, and this result was consistent with the results reported by Wang (2009) [37]and Xu (2012) [38], which indicated that the simulation of the supersonic ejector flow field using the established model was reliable.…”

Section: Optimazation and Verification A Parameter Optimizationmentioning

confidence: 99%

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CFD Simulation and Optimization of a Pneumatic Wheat Seeding Device

Wang

et al. 2020

IEEE Access

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To improve the performance of pneumatic wheat seeding devices with the goal of achieving pneumatic wheat seeding in soil conditions with high moisture content and heavy clay texture in rice-wheat rotation areas, a simulation optimization study of a pneumatic wheat seeding device was carried out using computational fluid dynamics. In this model, airflow was described by ANSYS Fluent software as a continuous compressible gas phase. The effects of accelerating air pressure, throat distance and nozzle diameter on the steady airflow velocity, the steady airflow length and the inlet 2 negative pressure of airflow field were studied, and a response surface analysis was applied to optimize the pneumatic wheat seeding device. The optimal parameter combination was achieved, which was an acceleration pressure of 700 kPa, a throat distance of 20 mm, a nozzle diameter of 7.2 mm and an acceleration pressure of 700 kPa. Comparative verification results showed that the steady airflow velocity, the steady airflow length and inlet 2 negative pressure of the optimized pneumatic wheat seeding device were 718 m/s, 182 mm and 0.49 kPa by simulations, which were 37%, 3% and 17% greater than those of the original device, respectively. This finding illustrates that the CFD model could describe the characteristics of airflow field well in a pneumatic seeding device and that the regression model for parameter optimization was reliable. Numerical simulation of the airflow field based on CFD approach can provide a theoretical basis for improving the operating performance of a pneumatic seeding device.

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“…where Re is the particle's Reynolds number. The dynamic differential equation [24] of wheat seed in the stable accelerating zone III is expressed as the following equation:…”

Section: A Description Of Wheat Pneumatic Seeding Devicementioning

confidence: 99%

Section: Optimazation and Verification A Parameter Optimizationmentioning

confidence: 99%

CFD Simulation and Optimization of a Pneumatic Wheat Seeding Device

Wang

et al. 2020

IEEE Access

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“…The coal flow rate is metered using a digital scale and a stopwatch where the mass of the coal reservoir (29) is measured before and after each experiment. The detailed dimensions of the ejector and its convergent-divergent nozzle used in the experimental work are given in previous work of the corresponding author [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Gas-Solid Mixture Flows in a Venturi

Ghonim

Sheha

Sakr

et al. 2018

The International Conference on Applied Mechanics and Mechanica

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The present paper concerns with studying experimentally the mixture of gas-solid (air-coal) flows in a Venturi meter in an attempt to prepare a metering tool for suspended gas-solid mixture flows. The different parameters that affect the gas-solid mixture flows metering process were determined and analyzed. In order to conduct the study, an experimental setup was designed and manufactured in the laboratory of the thermal power engineering in Menoufia University. Furthermore, seven nonstandard (long-throated) geometrical Venturi models with different diameters ratios and throat lengths were selected guided by previous literature and manufactured to be used in the present experimental work. Additionally, the experimental study was performed on the selected models to determine the effect of different Venturi meter geometric models on pressure drop sensitivity, pressure recovery, and to seek a viable method for determining loading ratio for suspended gas-solid flows in the Venturi. The results showed that the coal loading ratio affected greatly and positively both the pressure drop and recovery ratios of air-coal mixture flows in the Venturi. However, inlet and exit geometries of the Venturi had smaller effect on the pressure drop and recovery ratios than the coal loading ratio and particles diameter range. Additionally, decreasing the diameters ratio and increasing the throat length improved the Venturi pressure drop sensitivity to solids loading. Finally, the experimental results helped greatly to analyze the different parameters concerning the air-coal mixture flows in a Venturi meter and provided an insight on the feasibility of using the Venturi as a metering tool for suspended gas-solid mixture flows in a future continuation of the present work.

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“…The present work outlines such a methodology, and identifies and discusses the optimum geometries for design and manufacturing of supersonic ejectors. Most studies reported ejector performance as a function of dimensional parameters (e.g., Hewedy et al [14], Kim and Kwon [15], Boumaraf and Lallemand [16], Li et al [17]). In this paper, an optimization technique is presented based on the three main geometrical values as dimensionless parameters.…”

Section: Introductionmentioning

confidence: 99%

A Validated Numerical-Experimental Design Methodology for a Movable Supersonic Ejector Compressor for Waste-Heat Recovery

Alimohammadi

Persoons

Murray

et al. 2013

Journal of Thermal Science and Engineering Applications

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The aim of this paper is to develop the technical knowledge, especially the optimum geometries, for the design and manufacturing of a supersonic gas–gas ejector for a waste-heat driven vehicle cooling system. Although several studies have been performed to investigate the effects of geometrical configurations of gas–gas ejectors, a progressive design methodology of an ejector compressor for application to a vehicle cooling system has not yet been described. First, an analytical model for calculation of the ejector optimum geometry for a wide range of operating conditions is developed, using R134a as the working fluid with a rated cooling capacity of 2.5 kW. The maximum values of entrainment ratio (ω) have been estimated by correlation of the main parameters in a nondimensional form. The optimum values of nozzle throat diameter (dnt) and mixing chamber diameter (dmc) thus obtained are used as a starting point for the computational fluid dynamics (CFD) optimization covering a wide range of geometrical configurations. To assess the effect of various dimensional quantities, an optimization technique has been proposed for calculation of the most efficient geometry of the target ejector for manufacturing. Using a vehicle cooling system as a test case, the final optimized dimensions are reported and discussed. An experimental validation confirms the CFD results and the ejector performance with a normalized deviation of 5% between observed and simulated results, demonstrating that the methodology is a valid ejector design tool for a wide range of applications.

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Optimal Performance and Geometry of Supersonic Ejector

Cited by 20 publications

References 7 publications

CFD Simulation and Optimization of a Pneumatic Wheat Seeding Device

CFD Simulation and Optimization of a Pneumatic Wheat Seeding Device

Experimental Study on Gas-Solid Mixture Flows in a Venturi

A Validated Numerical-Experimental Design Methodology for a Movable Supersonic Ejector Compressor for Waste-Heat Recovery

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