Skip to main content
SpringerLink
Log in

Effects of component geometries and inflow conditions on ejector operational mode

  • Published:
Journal of Mechanical Science and Technology Aims and scope Submit manuscript

Abstract

The ejector system is a useful device for creating high altitude conditions for ground tests of supersonic engines. The ejector performance can be immediately changed by varying the ejector operational mode. The ejector nozzle pressure ratio is well known to have a significant effect of the operational mode of an ejector. However, the effects of the mixing duct length and other geometric design parameters on the ejector mode change have not been clearly determined. In this study, the effects of ejector component geometries and inflow conditions on ejector operational mode are investigated by numerical analysis. By changing the inflow conditions and geometric parameters, twelve test cases are studied. Using the numerical test results, the flow pattern and suction pressure performance of the ejector with a fixed secondary mass flow rate are compared. In the numerical test results, a high primary nozzle stagnation pressure induces a highly underexpanded flow, resulting in the critical operational mode. For the critical operational mode, the mixing duct must be sufficiently long to accommodate the shock train and the choking zone. Primary nozzles with wide angles also induce widely expanded nozzle flows and result in the critical operational mode.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

A* :

Aerodynamic throat area for the secondary flow

Dh :

Hydraulic diameter of the mixing duct

Lm :

Mixing duct length

ṁ p :

Mass flow rate of the primary flow

ṁ s :

Mass flow rate of the secondary flow

P0p :

Stagnation pressure of the primary flow

P0s :

Stagnation pressure of the secondary flow

Pb :

Back pressure of the ejector

R:

Gas constant

T0s :

Stagnation temperature of the secondary flow

γ:

Specific heat ratio

θn :

Primary nozzle angle

References

  1. B. M. Tashtoush, M. A. Al-Nimr and M. A. Khasawneh, A comprehensive review of ejector design, performance, and applications, Applied Energy, 240 (2019) 138–172.

    Article  Google Scholar 

  2. H. Wu, Z. Liu, B. Han and Y. Li, Numerical investigation of the influences of mixing chamber geometries on steam ejector performance, Desalination, 353 (2014) 15–20.

    Article  Google Scholar 

  3. A. Hakkaki-Fard, Z. Aidon and M. Ouzzane, A computational methodology for ejector design and performance maximisation, Energy Conversion and Management, 105 (2015) 1291–1302.

    Article  Google Scholar 

  4. J. Smolka, Z. Bulinski, A. Fic, A. Nowak, K. Banasiak and A. Hafner, A computational model of a transcritical R744 ejector based on a homogenous real fluid approach, Applied Mathematical Modelling, 37(3) (2013) 1208–1224.

    Article  MathSciNet  Google Scholar 

  5. J. Valle, J. Sierra-Pallares, P. G. Carrascal and F. C. Ruiz, An experimental and computational study of the flow pattern in a refrigerant ejector-Validation of turbulence models and real-gas effects, Applied Thermal Engineering, 89 (2015) 795–811.

    Article  Google Scholar 

  6. A. L. Addy and W. L. Chow, On the starting characteristics of supersonic ejector systems, Journal of Basic Engineering, Trans ASME, 86(4) (1964) 861–868.

    Article  Google Scholar 

  7. F. Li, R. Li, X. Li and Q. Tian, Experimental investigation on a R134a ejector refrigeration system under overall modes, Applied Thermal Engineering, 137 (2018) 784–791.

    Article  Google Scholar 

  8. W. Chen, M. Liu, D. Chong, J. Yan, A. B. Little and Y. Bartosiewicz, A 1D model to predict ejector performance at critical and sub-critical operational regimes, International Journal of Refrigeration, 36 (2013) 1750–1761.

    Article  Google Scholar 

  9. F. Li, Q. Tian, C. Wu, X. Wang and J. Lee, Ejector performance prediction at critical and subcritical operational modes, Applied Thermal Engineering, 115 (2017) 444–454.

    Article  Google Scholar 

  10. O. Lamberts, P. Chatelain and Y. Bartosiewicz, Numerical and experimental evidence of the Fabri-choking in a supersonic ejector, International Journal of Heat and Fluid Flow, 69 (2018) 194–209.

    Article  Google Scholar 

  11. Y. Zhu and P. Jiang, Experimental and numerical investigation of the effect of shock wave characteristics on the ejector performance, International Journal of Refrigeration, 40 (2014) 31–42.

    Article  Google Scholar 

  12. F. Mazzelli, A. B. Little, S. Garimella and Y. Barosiewicz, Computational and experimental analysis of supersonic air ejector: Turbulence modeling and assessment of 3D effects, International Journal of Heat and Fluid Flow, 56 (2015) 305–316.

    Article  Google Scholar 

  13. A. B. Little and S. Garimella, Shadowgraph visualization of condensing R134a flow through ejectors, International Journal of Refrigeration, 68 (2016) 118–129.

    Article  Google Scholar 

  14. Y. J. Lee, S. H. Kang, S. S. Yang and S. J. Kwon, Starting characteristics of the hypersonic wind tunnel with the Mach number variation, Journal of Mechanical Science and Technolog, 28(6) (2014) 2197–2204.

    Article  Google Scholar 

  15. D. J. Deturris, Fabri choking in a two-dimensional reacting flow mixer-ejector, AIAA Paper 2010–384 (2010).

  16. J. C. Dutton and B. F. Carroll, Optimal supersonic ejector design, Journal of Fluids Engineering, 108 (1986) 415–420.

    Google Scholar 

  17. J. C. Dutton, C. D. Mikkelsen and A. L. Addy, A theoretical and experimental investigation of the constant area, supersonic-supersonic ejector, AIAA Journal, 20(10) (1982) 1392–1400.

    Article  Google Scholar 

  18. S. M. V. Rao and G. Jagadeesh, Novel supersonic nozzles for mixing enhancement in supersonic, Applied Thermal Engineering, 71 (2014) 62–71.

    Article  Google Scholar 

  19. N. Wen, L. Wang, J. Yan, X. Li, Z. Liu, S. Li and G. Zou, Effects of operating conditions and cooling loads on two-stage ejector performances, Applied Thermal Engineering, 150 (2019) 770–780.

    Article  Google Scholar 

  20. T. Kanda, Y. Ogawa, D. Sugimori and M. Kojima, Conceptual design model of high-altitude test stand for rocket engines, Trans. Japan Soc. Aero. Space Sci., 59 (2016) 161–169.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Aerospace System Engineering, Sejong University, Seoul, Korea

    Sang Hun Kang & Jae Gang Kim

  2. Hyundai Rotem Company, Gyeonggi-do, Korea

    Hyuck-Joon Namkoung

Authors
  1. Sang Hun Kang
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Jae Gang Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Hyuck-Joon Namkoung
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Sang Hun Kang.

Additional information

Recommended by Associate Editor Joon Ahn

Sang Hun Kang received a Ph.D. from KAIST, Korea in 2004. He is currently an Associate Professor of Aerospace System Engineering Department, Sejong University, Korea. Prior to joining the faculty at Sejong University, he was a Senior Researcher at KARI. His research interests are in the area of ramjet engine, scramjet engine, combined cycle rocket engine, liquid rocket engine, turbulent combustion and radiation.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kang, S.H., Kim, J.G. & Namkoung, HJ. Effects of component geometries and inflow conditions on ejector operational mode. J Mech Sci Technol 33, 5003–5008 (2019). https://doi.org/10.1007/s12206-019-0747-6

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12206-019-0747-6

Keywords

Search

Navigation