低发射率材料涂敷方案对排气系统红外特性的影响

Influence of Low Emissivity Material Coating Scheme on Infrared Characteristics of Exhaust System

为了研究低发射率材料涂覆方案对排气系统红外特性的影响,建立了航空发动机排气系统模型,制定4种低发射率材料涂敷方案,将涂敷部位的发射率分别设置为0.3和0.1,针对低发射率材料对航空发动机排气系统3~5μm和8~14μm波段的红外辐射特性的影响进行数值仿真。结果表明:涂敷低发射率材料对排气系统3~5μm和8~14μm波段的红外辐射均有明显抑制作用, 在3~5μm和8~14μm波段,最优的涂覆方案对红外辐射强度最大值的抑制效果可达56%与37%。对排气系统中的加力筒体、喷管等部位涂敷低发射率材料,在3~5μm波段会增大其有效红外辐射强度,在8~14μm波段会减小喷管的有效红外辐射强度,增大加力筒体的有效红外辐射强度。

In order to study the influence of low emissivity material coating scheme on the infrared characteristics of the exhaust system,an aeroengine exhaust system model was established.Four low emissivity material coating schemes were formulated and the emissivity of the coated part was set to 0.3 and 0.1.Numerical simulation was carried out for the effect of low emissivity materials on the infrared radiation characteristics of the aeroengine exhaust system in the 3~5 micron waveband and 8~14 micron waveband.The results show that the coating of low emissivity materials can obviously inhibit the infrared radiation of exhaust system in 3~5 micron waveband and 8~14 micron waveband.In 3~5 micron waveband and 8~14 micron waveband,the maximum suppression effect on the maximum infrared radiation is 56%and 37%by the optimal coating scheme.The low emissivity materials will be applied to the afterburner duct and the exhaust nozzle system.The effective infrared radiation intensity of the parts is increased in 3~5 micron waveband,as well as in 8~14 micron waveband and the effective infrared radiation intensity of the exhaust nozzle is decreased,while the effective infrared radiation intensity of the afterburner duct is increased.