航空发动机排气系统红外辐射特征数值计算研究

Numerical Calculation of Infrared Characteristics for Aeroengine Exhaust System

基于N-S方程,建立了某型发动机排气系统的数值计算模型;利用辐射传输方程(RTE)积分法所编制的红外辐射特征计算程序,计算了该发动机在地面工作状态下的红外辐射特征分布;在加力状态下,考虑了soot粒子的光谱吸收与发射。分析了水蒸气、二氧化碳、一氧化氮和一氧化碳气体介质的红外光谱吸收与发射,并考虑了红外辐射在大气中的传输,最后给出了在3.0～5.0μm波段内排气系统的红外辐射强度分布。

The numerical calculation models for an aeroengine exhaust system, were built based on the Navier-Stokes equations. The infrared radiation characteristics distribution of the aeroengine at ground condition was calculated using the infrared radiation characteristics calculation program compiled by Radiation Transfer Equation （RTE） integration. The absorption and radiation of the soot spectrum were considered at the afierburning condition. The spectrum absorption and radiation of the gas media far the steam, carbon dioxide, nitrogen oxide and nitrogen monoxide were analyzed, and the transfer of infrared radiation in the atmosphere was also considered, and the infrared radiation intensity distribution for the exhaust system in the wave of 3.0-5.0 was given.