某型飞机短舱辐射换热计算

Numerical investigation of thermal radiation in a nacelle

针对某飞机地面慢车工况,进行了短舱内复合换热数值计算研究,分别运用球谐函数法、离散坐标法和蒙特卡洛法计算辐射换热.结果显示:不同计算方法所得结果总体上趋于一致,热辐射与自然对流耦合作用明显.与单纯自然对流的计算结果相比,舱内温度显著升高,各区域温度值上升7%～30%.考虑空气介质对不同波段热辐射的选择性吸收后,短舱内各计算点温度进一步上升.综合分析表明:地面条件下飞机短舱换热分析过程中热辐射的影响不可忽略.

Based on computational fluid dynamics method,airplane in idle condition was studied in conjunction with heat transfer in a nacelle.And different radiation computation methods including spherical harmonics,discrete ordinate and Monte Carlo method were adopted to simulate thermal radiation.The result shows that coupling effect of radiation and convection is obvious.In addition,compared with the simulation result of pure convection,nacelle ambient temperature predicted by coupling way is 7%~30% higher.While selective absorption of air under infrared radiation is taken into account,the ambient temperature rises further.Thus the effect of thermal radiation should not be ignored to simulate nacelle hear transfer in ground condition.