Volume 33 Issue 10
Oct.  2018
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Calculation of nozzle remote infrared imaging based on multi-scale multi-group wideband model and integrated differential hybrid algorithm[J]. Journal of Aerospace Power, 2018, 33(10): 2414-2423. doi: 10.13224/j.cnki.jasp.2018.10.013
Citation: Calculation of nozzle remote infrared imaging based on multi-scale multi-group wideband model and integrated differential hybrid algorithm[J]. Journal of Aerospace Power, 2018, 33(10): 2414-2423. doi: 10.13224/j.cnki.jasp.2018.10.013

Calculation of nozzle remote infrared imaging based on multi-scale multi-group wideband model and integrated differential hybrid algorithm

doi: 10.13224/j.cnki.jasp.2018.10.013
  • Received Date: 2017-06-01
  • Publish Date: 2018-10-28
  • To solve the problem that existing k distribution model is not suitable for high temperature flow 3-5μm wave band emission radiation transmission attenuation characteristic in atmospheric long distance calculation,multi-scale multi-group technology used in full-spectrum model before was applied in wideband model, and the grouping state points on the spectral absorption coefficient were adjusted.The calculation results of one-dimensional/quasi one-dimensional numerical example of infinite width multilayer gas radiation characteristics show that multi-scale multi-group technology can improve the calculation precision of original full spectrum and wideband model while keeping compatibility with rational of gray wall. On this basis, the coupling heat transfer characteristics and the remote infrared characteristics of V nozzle trailing edge contraction with cooling device were studied. The results show that the gas radiation effect on the solid wall temperature distribution in the nozzle can not be ignored. The prediction error of the remote infrared images for transonic exhaust system at 70km with use of the multi-scale multi-group wideband model is about 7%.

     

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