Computational Analysis of Mixing Guide Vane Effects on Performance of the Supersonic Ejector-Diffuser System


The flow field in the ejector-diffuser system and its optimal operation condition are hardly complicated due to the complicated turbulent mixing, compressibility effects and even flow unsteadiness which are generated inside the ejector- diffuser system. This paper aims at the improvement in ejector-diffuser system by focusing attention on entrainment ratio and pressure recovery. Several mixing guide vanes were installed at the inlet of the secondary stream for the purpose of the performance improvement of the ejector system. A Computational Fluid Dynamics (CFD) method based on Fluent has been applied to simulate the supersonic flows and shock waves inside the ejector. A finite volume scheme and density-based solver with coupled scheme were applied in the computational process. Standard k-ω turbulent model, implicit formulations were used considering the accuracy and stability. Previous experimental results showed that more flow vortexes were generated and more vertical flow was introduced into the stream under a mixing guide vane influence. Besides these effects on the secondary stream, the mixing guide vane effects on the shock system of the primary stream were also investigated in this paper. Optimal analysis results of the mixing guide vane effects were also carried out in detail in terms of the positions, lengths and numbers to achieve the best operation condition. The comparison of ejector performance with and without the mixing guide vane was obtained. The ejector-diffuser system performance is discussed in terms of the entrainment ratio, pressure recovery as well as total pressure loss.

Share and Cite:

F. Kong, H. Kim, Y. Jin and T. Setoguchi, "Computational Analysis of Mixing Guide Vane Effects on Performance of the Supersonic Ejector-Diffuser System," Open Journal of Fluid Dynamics, Vol. 2 No. 3, 2012, pp. 45-55. doi: 10.4236/ojfd.2012.23005.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] K. Chunnanond and S. Aphornratana, “Ejectors: Applications in Refrigeration Technology,” Renewable and Sustainable Energy Reviews, Vol. 8, No. 2, 2004, pp. 129155. doi:10.1016/j.rser.2003.10.001
[2] Z. Aidoun and M. Ouzzane, “The Effect of Operating Conditions on the Performance of a Supersonic Ejector for Refrigeration,” International Journal of Refrigeration, Vol. 27, No. 8, 2004, pp. 974-984. doi:10.1016/j.ijrefrig.2004.05.006
[3] Y. Bartosiewicz, Z. Aidoun and Y. Mercadier, “Numerical Assessment of Ejector Operation for Refrigeration Applications Based on CFD,” Applied Thermal Engineering, Vol. 26, No. 5-6, 2006, pp. 604-612. doi:10.1016/j.applthermaleng.2005.07.003
[4] J. Yan, S. Shao, J. Liu and Z. Zhang, “Experiment and Analysis on Performance of Steam-Driven Jet Injector for District-Heating System,” Applied Thermal Engineering, Vol. 25, No. 8-9, 2005, pp. 1153-1167. doi:10.1016/j.applthermaleng.2004.09.001
[5] C. J. Korresa, A. T. Papaioannoub, V. Lygeroub and N. G. Koumoutsosb, “Solar Cooling by Thermal Compression: The Dependence of the Jet Thermal Compressor Efficiency on the Compression Ratio,” Energy, Vol. 27, No. 8, 2002, pp. 795-805.
[6] M. Ouzzane and Z. Aidoun, “Model Development and Numerical Procedure for Detailed Ejector Analysis and Design,” Applied Thermal Engineering, Vol. 23, No. 18, 2003, pp. 2337-2351. doi:10.1016/S1359-4311(03)00208-4
[7] A. Selvaraju and A. Mani, “Analysis of an Ejector with Environment Friendly Refrigerants,” Applied Thermal Engineering, Vol. 24, No. 5-6, 2004, pp. 827-838. doi:10.1016/j.applthermaleng.2003.08.016
[8] Y. M. Chen and C. Y. Sun, “Experimental Study of the Performance Characteristics of a Steam-Ejector Refrigeration System,” Experimental Thermal and Fluid Science, Vol. 15, No. 4, 1997, pp. 384-394. doi:10.1016/S0894-1777(97)00006-X
[9] B. J. Huang and J. M. Chang, “Empirical Correlation for Ejector Design,” International Journal of Refrigeration, Vol. 22, No. 5, 1999, pp. 379-388. doi:10.1016/S0140-7007(99)00002-X
[10] B. J. Huang, J. M. Chang, C. P. Wang and V. A. Petrenko, “A 1-D Analysis of Ejector Performance,” International Journal of Refrigeration, Vol. 22, No. 5, 1999, pp. 354364. doi:10.1016/S0140-7007(99)00004-3
[11] E. D. Rogdakis and G. K. Alexis, “Design and Parametric Investigation of an Ejector in an Air-Conditioning System,” Applied Thermal Engineering, Vol. 20, No. 2, 2000, pp. 213-226. doi:10.1016/S1359-4311(99)00013-7
[12] S. Aphornratana and I. W. Eames, “A Small Capacity Steam-Ejector Refrigerator: Experimental Investigation of a System using Ejector with Movable Primary Nozzle,” International Journal of Refrigeration, Vol. 20, No. 5, 1997, pp. 352-358. doi:10.1016/S0140-7007(97)00008-X
[13] Y. J. Chang and Y. M. Chen, “Enhancement of a SteamJet Refrigerator using a Novel Application of the Petal Nozzle,” Experimental Thermal and Fluid Science, Vol. 22, No. 3-4, 2000, pp. 203-211. doi:10.1016/S0894-1777(00)00028-5
[14] R. Yap?c? and H. K. Ersoy, “Performance Characteristics of the Ejector Refrigeration System Based on the Constant Area Ejector Flow Model,” Energy Conversion and Management, Vol. 46, No. 18-19, 2005, pp. 3117-3135. doi:10.1016/j.enconman.2005.01.010
[15] I. W. Eames, “A New Prescription for the Design of Supersonic Jet-Pumps: The Constant Rate of Momentum Change Method,” Applied Thermal Engineering, Vol. 22, No. 2, 2002, pp. 121-131. doi:10.1016/S1359-4311(01)00079-5
[16] Y. Bartosiewicza, Z. Aidouna, P. Desevauxb and Y. Mercadierc, “Numerical and Experimental Investigations on Supersonic Ejectors,” International Journal of Heat and Fluid Flow, Vol. 26, No. 1, 2005, pp. 56-70. doi:10.1016/j.ijheatfluidflow.2004.07.003
[17] V. Lijo, H. D. Kim, S. Matsuo and T. Setoguchi, “A Study of the Supersonic Ejector-Diffuser System with an Inlet Orifice,” Aerospace Science and Technology, 2011.
[18] N. H. Aly, A. Karameldina and M. M. Shamloulb, “Modelling and Simulation of Steam Jet Ejectors,” Desalination, Vol. 123, No. 1, 1999, pp. 1-8. doi:10.1016/S0011-9164(99)00053-3
[19] M. T. Kandakure, V. G. Gaikar and A. W. Patwardhan, “Hydrodynamic Aspects of Ejectors,” Chemical Engineering Scien`ce, Vol. 60, No. 22, 2005, pp. 6391-6402. doi:10.1016/j.ces.2005.04.055
[20] M. T. Holtzapple, “High-Efficiency Jet Ejector,” Texas A & M University, College Station, 2001.
[21] D. V. Manohar, “Desalination of Seawater Using a HighEfficiency Jet Ejector,” Master Thesis, Texas A & M University, College Station, 2005.
[22] W. Somsak, “Optimization of a High-Efficiency Jet Ejector by Computational Fluid Dynamics Software,” Master Thesis, Texas A & M University, College Station, 2005.
[23] W. Somsak, “CFD Optimization Study of High-Efficiency Jet Ejector,” Ph.D. Thesis, Texas A & M University, College Station, 2008.

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.