基于BRDF的排气系统红外辐射特征计算研究

Abstract

Abstract: In order to improve the computational precision of infrared radiation of a turbofan engine exhaust system, the effect of surface reflection characteristics on computational results is investigated. The reverse Monte Carlo (RMC) method is adopted to compute the infrared characteristics, and both bidirectional reflectance distribution function (BRDF) and the diffuse reflection models are employed. The computational infrared radiation intensities of a model engine exhaust system are compared with the experimental results. The parameters of the BRDF model are determined by investigating the effect of the parameters on computational results. The study shows that the adoption of BRDF model is an effective way to improve the computational precision of infrared radiation. For the case studied in this paper, the computational error of infrared radiation is obviously reduced at the orientation where the radiation mainly comes from low emittance and high reflectance surface when BRDF model is adopted.

Key words: aero-engine, exhaust system, infrared radiation, reverse Monet Carlo method, bidirectional reflectance distribution function

CLC Number:

HUANG Wei, JI Honghu. Computational Investigation of Infrared Radiation Characteristics of Exhaust System Based on BRDF[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2012, 33(7): 1227-1235.

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Computational Investigation of Infrared Radiation Characteristics of Exhaust System Based on BRDF

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