Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
권호 표지
DOI QR코드

DOI QR Code

Study of the Supersonic Ejector-Diffuser System with a Mixing Guide Vane

혼합 안내깃을 적용한 초음속 이젝터-디퓨져 시스템에 대한 연구

  • Received : 2012.01.30
  • Accepted : 2012.12.14
  • Published : 2013.02.01
Download PDF
⟨ Previous Next ⟩

Abstract

Ejector-diffuser system makes use of high-pressure primary stream to entrain the low-pressure secondary stream through pure shear action between two streams. In general, the flow field in the ejector-diffuser system is highly complicated due to turbulent mixing, compressibility effects. A fatal drawback of the ejector system is in its low efficiency. Many works have been done to improve the performance of the ejector system, but not yet satisfactory. In the present study, a mixing guide vane was installed at the inlet of the secondary stream for the purpose of the performance improvement of the ejector system. A CFD method has been applied to simulate the supersonic flows inside the ejector-diffuser system. The present results obtained were validated with existing experimental data. The mixing guide vane effects are discussed in terms of the entrainment ratio, total pressure loss as well as pressure recovery.

이젝터-디퓨져 시스템은 두 유동 사이의 순수전단운동을 통해 저압의 2차유동을 동반하여 고압의 주된 유동을 만들어 낸다. 일반적으로, 이젝터-디퓨져 시스템에서 유동장은 난류 혼합, 압축 효과로 인해 매우 복잡하게 되며, 저효율의 큰 문제점을 가지고 있다. 현재까지 이젝터 시스템의 성능을 향상시키기 위한 많은 연구가 수행 되어 왔지만 만족스럽지 않은 실정이다. 본 연구에서는 이젝터 시스템의 성능향상을 위해 2차유동의 입구에 혼합 안내깃을 설치하였으며, CFD는 이젝터-디퓨져 시스템의 초음속 내부 유동을 모사하여 수행하였다. 얻어진 결과는 기존의 실험결과를 입증하였으며, 본 논문에서 혼합 안내깃 효과를 전압 손실, 유인비 및 압력회복에 대해서 논의되었다.

Keywords

References

  1. Riffat, S. B., Gan, G. and Smith, S., "Computational Fluid Dynamics Applied to Ejector Heat Pumps," Applied Thermal Engineering, Vol. 16, No. 4, 1996, pp.291-297 https://doi.org/10.1016/1359-4311(95)00033-X
  2. Riffat, S. B., Everitt, P., "Experimental and CFD Modelling of an Ejector System for Vehicle Air Conditioning," Journal of the Institute of Energy, Vol. 72, 1999, pp.41-47
  3. Huang, B. J., Petrenko, V. A., Chang, J. M., Lin, C. P. and Hu, S. S., "A Combined Cycle Refrigeration System Using Ejector-cooling as the Bottom Cycle," International Journal of Refrigeration, Vol. 24, No. 5, 2001, pp.391-399 https://doi.org/10.1016/S0140-7007(00)00040-2
  4. Kumar, R. S., Kumaraswamy, S., Mani, A., "Experimental Investigations on a Two-phase Jet Pump Used in Desalination Systems," Desalination, Vol. 204, No. 1-3, 2007, pp.437-447 https://doi.org/10.1016/j.desal.2006.03.546
  5. Zhang, J. Z., Shan, Y., Li, L. G., "Computation and Validation of Parameter Effects on Lobed Mixer-ejector Performances," Chinese Journal of Aeronautics, Vol. 3, 2005, pp.93-198
  6. Hong, W. J., Alhussan, K., Zhang, H., Garris, C. A., "A Novel Thermally Driven Rotor-vane/Pressure-exchange Ejector Refrigeration System with Environmental Benefits and Energy Efficiency," Energy, Vol. 29, No. 12-15, 2004, pp.2331-2345 https://doi.org/10.1016/j.energy.2004.03.050
  7. Munday, J. T., Bagster, D. F., "A New Ejector Theory Applied to Steam Jet Refrigeration," Ind. Eng. Chem. Proc. DD, Vol. 16, No. 4, 1997, pp.442-449
  8. Riffat, S. B. and Omer, S. A., "CFD Modelling and Experimental Investigation of an Ejector Refrigeration System Using Methanol as the Working Fluid," International Journal of Energy Research, Vol. 25, No. 2, 2001, pp.115-128 https://doi.org/10.1002/er.666
  9. Reinke, B., Neal, M. and Gupta, S. M., "Flow inside a Jet-ejector Pump for Vacuum Applications," Journal Ind. Inst. Chem. Engrs., Vol. 3, 2002, p.44
  10. Manohar, D.V., "Desalination of Seawater Using a High-efficiency Jet Ejector," Master Thesis, Texas A&M University, 2005
  11. Holtzapple, M. T., "High-efficiency Jet Ejector," Texas A&M University, 2001
  12. Somsak, W., "CFD Optimization Study of High-efficiency Jet Ejector," Doctoral Dissertation, Texas A&M University, 2008
  13. Amel, H., François, H., Sébastien, L., Jean-Marie, S., Yann, B., "CFD Analysis of a Supersonic Air Ejector. Part II: Relation between Global Operation and Local Flow Features," Applied Thermal Engineering, Vol. 29, No.14-15, 2009, pp.2990-2998 https://doi.org/10.1016/j.applthermaleng.2009.03.019