Shock circle model for ejector performance evaluation

Zhu, Yinhai; Cai, Wenjian; Chen, Wen; Li, Yanzhong

doi:10.1016/j.enconman.2007.03.024

Cited by 185 publications

(59 citation statements)

References 20 publications

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“…The LRVP for Tokamak have analysed and designed by Khan et al [3]. Zhu et al [4] and Chong et al [5] proposed a 2D exponential model to predict the velocity distribution in ejector, however the pressure is still assumed to be uniform in the radial direction. Sözen et al [6] explored the exergy analysis of an ejector-absorption heat transformer using artificial neural network approach.…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

et al. 2016

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“…Recently, a shock circle model has been proposed to tackle the actual non-uniform velocity distribution by introducing a ''shock circle" at entrance of the constant-area mixing chamber [4,5]. These theoretical results can be used to analyze the influence of certain ejector geometries, such as the primary nozzle throat diameter and the mixing part diameter on the ejector performance.…”

Section: Governing Equationsmentioning

confidence: 99%

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Am¹,

Mh²,

Zm³

et al. 2017

J Aeronaut Aerospace Eng

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This paper describes a numerical study of gas-gas ejector performance for different operating conditions and geometrical configurations. The performance of ejector obtained based on a simulation procedure of linearized and axisymmetric subsonic and supersonic flow using Fluent Package. A conventional finite-volume scheme utilized to solve two-dimensional transport equations with the standard k-ω SST turbulence model. The model is solved in three regions namely, the primary flow nozzle, the secondary flow channel, and the region of interaction between the supersonic nozzle jet and the secondary flow. The effect of gas motive pressure the mixing part and tail section (pipe or diffuser) geometry on the ejector performance are studied. The computational results are validated using published experimental data with acceptable agreements. The numerical results indicate that the ejector geometry has a pronounced effect on the flow parameters (i.e., pressure and gas velocity) and the ejector performance. In addition, predicted numerical results indicate that when the motive-stream velocity exceeds the speed of sound, shock waves are unavoidable inside ejectors and that shock wave pattern in mixing part has a dominant effect on ejector performance. In addition, the results indicate that the shock location inside the nozzle and the separation point are affected by the motive pressure. The results show also that configuration with convergent-divergent mixing section is much better for mixing process than the other tested configurations.

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“…Chen et al, 2014a;W. Chen et al, 2013a;Kumar and Ooi, 2014;Zhu et al, 2007). These models, with different mathematical formulations, have been selected among the most recent models proposed in the literature.…”

Section: Models Employedmentioning

confidence: 99%

“…ðmp þms Þum mp upy þms usy M3 (Zhu et al, 2007) Parameters uniformly distributed in the radius r direction; Secondary flow reaches chocking condition at cross section yey; Ideal gas with k ¼ cost. Kumar and Ooi, 2014) Secondary flow reaches chocking condition at cross section yey; Normal shock fixed at the end of the mixing chamber; Ideal gas with k ¼ f(T).…”

Section: Models Evaluationmentioning

confidence: 99%

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

Besagni

Mereu

Leo

et al. 2015

International Journal of Refrigeration

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COP Entrainment ratio Ejector refrigeration Ejector efficiencies a b s t r a c tThis paper studies the influence of working fluids over the performance of heat driven ejector refrigeration systems performance by using a lumped parameter model. The model used has been selected after a comparison of different models with a set of experimental data available in the literature. The effect of generator, evaporator and condenser temperature over the entrainment ratio and the COP has been investigated for different working fluids in the typical operating conditions of low grade energy sources. The results show a growth in performance (the entrainment ratio and the COP) with a rise in the generator and evaporator temperature and a decrease in the condenser temperature. The working fluids have a great impact on the ejector performance and each refrigerant has its own range of operating conditions. R134a is found to be suitable for low generator temperature (70e100 C), whereas the hydrocarbons R600 is suitable for medium generator temperatures (100e130 C) and R601 for high generator temperatures (130e180 C). i n t e r n a t i o n a l j o u r n a l o f r e f r i g e r a t i o n 5 8 ( 2 0 1 5 ) 1 5 4 e1 7

show abstract

Shock circle model for ejector performance evaluation

Cited by 185 publications

References 20 publications

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

A study of working fluids for heat driven ejector refrigeration using lumped parameter models

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