采用κ－ε两方程模型和壁面函数法数值模拟舰船排气系统红外抑制装置缩比模型的湍流场和温度场分布．经实验校模后利用自模化原理将数值模拟方法推广到实物装置上去．在建立了观察点与装置有关区域之间看视关系后，利用Ｈｏｔｅｌ的区域法就可计算获得装置的红外辐射场分布． The κ-ε two-equation model and the wall function method were used to simulate the turbulent flow field and the temperature distribution in the IR model of the exhaust system. The experimental model after the use of self-modeled numerical simulation method will be extended to the physical device up. After establishing the relationship between the observation point and the relevant area of ​​the device, the distribution of the infrared radiation field of the device can be obtained by using the area method of the Hotel.