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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2012, Vol. 33 ›› Issue (8): 1394-1399.

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Prediction of Flow Separation in Asymmetric Ramp Nozzle

GE Jianhui, XU Jinglei, WANG Mingtao, MO Jianwei   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2011-10-14 Revised:2011-11-03 Online:2012-08-25 Published:2012-08-23
  • Supported by:
    National Natural Science Foundation of China (90916023)

Abstract: The asymmetric ramp nozzle is a key component of the scramjet engine and turbine based combined cycle(TBCC) engine, but it often exhibits serious flow separation in the nozzle off-design point. Focusing on the flow separation in an over-expended asymmetric ramp nozzle, new criteria of flow separation based on 2-D computational fluid dynamics (CFD) technique is obtained with reference to the criteria of flow separation in a symmetrical nozzle. Furthermore, their universality and accuracy are verified by testing other asymmetric ramp nozzle models working in over-expended conditions. The results indicate that the new criteria can also be used for other different asymmetric ramp nozzles. The new criteria and test data show excellent agreement by the range of the experiment pressure ratio with root mean square error of 3.68%,which provides proof that the new criteria used for flow separation prediction in asymmetric ramp nozzle are reliable.

Key words: scramjet engine, asymmetric ramp nozzle, flow separation, separation criteria, over-expension

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