Journal of Applied Mathematics

  • J. Appl. Math.
  • Volume 2015, Special Issue (2015), Article ID 352529, 8 pages.

Coupled Analysis of the Film-Cooling and Infrared Characteristics of an Axisymmetric Vectored Nozzle

Xiaoying Zhang and Rui Li

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This study adopts a narrow band model to investigate the cooling and radiation of a vectoring nozzle and to compute the gas spectral characteristic in infrared band. The radiative heat transfer between the hot gas and the wall is considered with an enclosure model. The calculation of film cooling is performed through a cooling effectiveness method. A coupled heat balance equation of heat flux and wall temperature is established on the multilayer structure of the nozzle, including the wall, heat shield, and outer shield, and a Newton-Raphson scheme is taken for solution. Temperature on the expansion part of an experimental nozzle in NASA TN D-1988 is investigated for verification. Another vectoring nozzle with a multirow of film cooling is also investigated. This study shows that the film in the heat shield remarkably cools the convergent part of the nozzle, thereby increasing the temperature on the expansion part of the nozzle. The deflection of the nozzle can change the distribution of the wall temperature and the radiation on the expansion part, which is lower on the deflection side than on the opposite side. The radiation from the nozzle outlet is high, particularly along the deflection direction in the rear hemisphere.

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J. Appl. Math., Volume 2015, Special Issue (2015), Article ID 352529, 8 pages.

First available in Project Euclid: 13 October 2015

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Zhang, Xiaoying; Li, Rui. Coupled Analysis of the Film-Cooling and Infrared Characteristics of an Axisymmetric Vectored Nozzle. J. Appl. Math. 2015, Special Issue (2015), Article ID 352529, 8 pages. doi:10.1155/2015/352529.

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