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Self-similarity characteristics of highly underexpanded sonic jet[J]. Journal of Aerospace Power, 2017, 32(1): 177-187. doi: 10.13224/j.cnki.jasp.2017.01.024
Citation: Self-similarity characteristics of highly underexpanded sonic jet[J]. Journal of Aerospace Power, 2017, 32(1): 177-187. doi: 10.13224/j.cnki.jasp.2017.01.024
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Self-similarity characteristics of highly underexpanded sonic jet

doi: 10.13224/j.cnki.jasp.2017.01.024
  • Received Date: 2015-05-11
  • Publish Date: 2017-01-28
    Abstract
  • A three-dimensional large eddy simulation(LES) of a highly underexpanded jet with nozzle pressure ratio(NPR) of 5.60 and the magnitude of flow Reynolds number of 105 was carried out based on high-pressure gas jet injection model and high-resolution mesh. The near-field wave structures of the highly underexpanded jet were successfully captured by LES, and also agreed well with the available references data. The quantitative investigation of the radial distributions of streamwise velocity and nitrogen mass fraction was performed to reveal the self-similarity characteristics of the highly underexpanded jet.Result showed that,the self-similarity characteristics of radial profiles of streamwise velocity and nitrogen mass fraction previously observed for subsonic jets were also confirmed in the downstream jet core for the current highly underexpanded jet. The flow where the self-similarity started was still supersonic, showing a distinctive feature for the self-similarity characteristics of highly underexpanded jets. The proposed Gauss fitting formulas can well present the self-similarity characteristics of the regions close to or far away from the jet centerline. In addition, the development feature of the jet shear layer was studied, the jet growth rate obtained was compared with the previous experimental results, and the possible explanation for the difference was observed.

     

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