Volume 34 Issue 11
Nov.  2019
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Article Navigation >  Journal of Aerospace Power  > 2019  >  34(11): 2339-2346
HE Chengjun, LI Jianqiang, FAN Zhaolin. Flow separation unsteadiness in single expansion ramp nozzle[J]. Journal of Aerospace Power, 2019, 34(11): 2339-2346. doi: 10.13224/j.cnki.jasp.2019.11.005
Citation: HE Chengjun, LI Jianqiang, FAN Zhaolin. Flow separation unsteadiness in single expansion ramp nozzle[J]. Journal of Aerospace Power, 2019, 34(11): 2339-2346. doi: 10.13224/j.cnki.jasp.2019.11.005
shu

Flow separation unsteadiness in single expansion ramp nozzle

doi: 10.13224/j.cnki.jasp.2019.11.005

  • High Speed Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China

  • Received Date: 2019-05-14
  • Publish Date: 2019-11-28
    Abstract
  • In combination with the focus schlieren and dynamic pressure measurement technology, the flow field and nozzle wall pressure were experimentally measured, under the different nozzle pressure ratios (NPR) of the single expansion ramp nozzle (SERN). Time and frequency domain analysis exhibited unsteady flow characteristics within the nozzle. Results showed that the flow field structure inside SERN was obvious asymmetrical. The flow separation mode on the upper wall of the nozzle was at restricted shock separation (RSS), and that on the lower wall at free shock separation (FSS); in RSS mode, the pressure on the wall near the outlet was sharply oscillated in relation to FSS mode. The pressure standard deviation of the upper and lower walls of the nozzle was peaked near the separation point, and the probability density function distribution was skewed to one side or showed double peaks. In RSS mode, the shock motion exhibited obvious low-requency characteristics. In FSS mode, the unsteady characteristics of the shock wave were not only affected by the pressure disturbance of the recirculation region, but also affected by the separated shear layer.

     

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