Journal of Thermal Science

, 8:79

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

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

DOI: 10.1007/s11630-999-0028-2

Cite this article as:
Kim, HD., Setoguchi, T., Yu, S. et al. J. of Therm. Sci. (1999) 8: 79. doi:10.1007/s11630-999-0028-2


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 flowsupersonic ejectorsupersonic diffuserinternal flowshock waveturbulent mixing

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