Navier-Stokes computations of the supersonic ejector-diffuser system with a second throat

  • Heuy-Dong Kim
  • Toshiaki Setoguchi
  • Shen Yu
  • S. Raghunathan


The supersonic ejector-diffuser system with a second throat was simulated using CFD. An explicit finite volume scheme was applied to solve two-dimensional Navier-Stokes equations with standard k – ε turbulence model. The vacuum performance of the supersonic ejector-diffuser system was investigated by changing the ejector throat area ratio and the operating pressure ratio. Two convergent-divergent nozzles with design Mach number of 2.11 and 3.41 were selected to give the supersonic operation of the ejector-diffuser system. The presence of a second throat strongly affected the shock wave structure inside the mixing tube as well as the spreading of the under-expanded jet discharging from the primary nozzle. There were optimum values of the operating pressure ratio and ejector throat area ratio for the vacuum performance of the system to maximize.


compressible flow supersonic ejector supersonic diffuser internal flow shock wave turbulent mixing 


  1. [1]
    Fabri, J.; Siestrunck, R. “Supersonic Air Ejectors,” Advance in Applied Mechanics, N. Y. Academic Press, 5, pp. 1–34, (1958).MATHGoogle Scholar
  2. [2]
    Alperin, M.; Wu, J. J. “Thrust Augmenting Ejectors, Part 2,” AIAA Journal, 21, No.12, pp. 1698–1706, (1983).ADSGoogle Scholar
  3. [3]
    Yang, T. T.; Ntone, F.; Jiang, T.; Pitts, D. R. An Investigation of High Performance, Short Thrust Augmenting Ejectors,” ASME Journal of Fluid Engineering, 107, pp. 23–30, (1985).CrossRefGoogle Scholar
  4. [4]
    Matsuo, K.; Sasaguchi, K; Tasaki, K.; Mochizuki, H. “Investigation of Supersonic Air Ejectors, Part 1, Performance in the Case of Zero-Secondary Flow,” Bulletin of JSME, Ser. B, 24, No.198, pp. 2090–2097, (1981).Google Scholar
  5. [5]
    Liu, C. F.; Chen, F., “Analysis of Performance of the Second-Throat Ejector-Diffuser,” Journal of the Chinese Mechanical Engineering Society, 13, No. 5, pp. 478–482, (1992).Google Scholar
  6. [6]
    Keenan, J. H.; Neumann, E. P.; Lustwerk, F.: “An Investigation of Ejector Design by Analysis and Experiment,” Journal of Applied Mechanics, 17, No. 3, pp. 299–309, (1950).Google Scholar
  7. [7]
    Francis, W. E.; Hoggarth, M. L.; Templeman, J. J.: “The Design of Jet Pumps and Injectors for Gas Distribution and Combustion Purposes,” Proceedings of Symposium on Jet Pumps and Ejectors, BHRA Fluid Engineering-Institution of Chemical Engineers, No. 6, pp. 81–96, (1972).Google Scholar
  8. [8]
    Hsu, C. T.; “Investigation of an Ejector Heat Pump by Analytical Methods,” ORNL/CON-144, Oak Ridge National Laboratory, (1972).Google Scholar
  9. [9]
    Chow, W. L.; Addy, A. L.: “Interaction between Primary and Secondary Streams of Supersonic Ejector Systems and Their Performance Characteristics,” AIAA Journal, 11, No.4, (1964).Google Scholar
  10. [10]
    Quinn, B. “Ejector Performance at High Temperatures and Pressures,” Journal of Aircraft, 13, No. 12, pp. 948–954, (1976).ADSCrossRefGoogle Scholar
  11. [11]
    Tillman, T. G.; Presz, Jr. W. M.: “Thrust Characteristics of a Supersonic Mixer Ejector,” Journal of Propulsion and Power, 11, No. 5, pp. 931–937, (1995).Google Scholar
  12. [12]
    Nicholas, T. M. T.; Narayanan, A. K.; Muthunayagam, A. E.: “Mixing Pressure Rise Parameter for Effect of Nozzle Geometry in Diffuser-Ejectors,” Journal of Propulsion and Power, 12, No. 2, pp. 431–433, (1995).Google Scholar
  13. [13]
    Kurian, J.: “Mixing Performance of Radially Lobed Supersonic Nozzles,” Proceedings of 13th International Symposium on Air Breathing Engines, ISABE 97-7122, 1, pp. 891–900, (1997).Google Scholar
  14. [14]
    Srikrishnan, A. R.; Kurian, J.; Sriramulu, V.: “An Experimental Study on Mixing Enhancement by Petal Nozzle in Supersonic Flow,” Journal of Propulsion and Power, 12, No. 1, pp. 165–169, (1996).Google Scholar
  15. [15]
    Kumar, R. R.; Kurian, J.: “Estimation of Mixing of High-Speed Streams,” Journal of Propulsion and Power, 12, No. 2, pp. 429–431, (1995).CrossRefGoogle Scholar
  16. [16]
    Chen, F.; Liu, C. F.; Yang, J. Y.: “Supersonic Flow in the Second-Throat Ejector-Diffuser System,” Journal of Spacecraft and Rockets, 31, No. 1, pp. 123–129, (1994).ADSGoogle Scholar
  17. [17]
    Wang, J. J.; Chen, F.: “On the Start Condition of a Second-Throat Ejector-Diffuser,” Aeronutical Journal, 35, pp. 321–326, (1996).Google Scholar
  18. [18]
    Matsuo, K.; Sasaguchi, K.; Tasaki, K.; Mochizuki, H.: “Investigation of Supersonic Air Ejectors, Part 2, Effects of Throat-Area-Ratio on Ejector Performance,” Bulletin of JSME, Ser. B, 25, No. 210, pp. 1898–1905, (1982).Google Scholar
  19. [19]
    Matsuo, K.; Kim, H. D.: “Shock Train and Pseudo-Shock Phenomena in Internal Gas Flows,” Progress in Aerospace Sciences, 35, No. 1, pp. 33–100, (1999).CrossRefADSGoogle Scholar

Copyright information

© Science Press 1992

Authors and Affiliations

  • Heuy-Dong Kim
    • 1
  • Toshiaki Setoguchi
    • 2
  • Shen Yu
    • 3
  • S. Raghunathan
    • 4
  1. 1.School of Mechanical EngineeringAndong National University 388AndongKorea
  2. 2.Department of Mechanical EngineeringSaga University 1SagaJapan
  3. 3.Institute of Engineering ThermophysicsChinese Academy of SciencesBeijingChina
  4. 4.Department of Aeronautical EngineeringThe Queen’s University of BelfastBelfastNorthern Ireland, UK

Personalised recommendations