采用流体动力学数值模拟方法对无人机及其螺旋桨发动机三维流场进行数值计算，获取了飞机的整体温度分布、螺旋桨发动机高温排气温度、浓度三维分布，为无人机红外辐射特性、空气动力学特性的计算与分析提供数据支撑。

The flow field of unmanned aircraft vehicle (UAV) and piston engine airscrew has been calculated using hydrodynamics numerical simulation method. The three dimension temperature distribution of the aircraft, the three dimension temperature distribution and the consistence distribution of high-temperature exhaust gas has been presented, to support for the optimize and improve the infrared radiation characteristics of UAV, and to supply more robust database for the aerodynamics characteristics analysis of UAV, and make a significant joint contribution to the future infrared counterwork capability for the active service UAV.