中文摘要：

基于分区控制技术，发展了型面易控的双s弯喷管型面设计方法，用CFD数值模拟技术，对双s弯喷管的流动特性进行了数值模拟．采用信息通道界面（MPI）并行算法编写了基于离散传递法的红外辐射特性计算程序，对双S弯喷管红外辐射特性进行了计算，并与具有相同进出口面积的轴对称收缩喷管的红外辐射特性进行了对比．研究表明：双s弯喷管宽边探测面红外辐射强度低于窄边探测面红外辐射强度，最大幅度为800o；与轴对称收缩喷管相比，双s弯喷管红外辐射强度明显降低，尤其在宽边探测面的30°～40°探测方向上，比轴对称收缩喷管的红外辐射强度低大约30％．

英文摘要：

Based on partition control technology and CFD numerical simulation, the eas ily controllable design methods of double Snozzle type surface were developed, and the flow characteristics of double Snozzle were simulated. With message passing interface （MPI） parallel algorithm and discrete transfer method, the software of infrared radiation character istics was programmed, The infrared radiation characteristics of double Snozzle were com puted by the software. The infrared radiation characteristics were compared with those of axisymmetric convergent nozzle with the same inlet and outlet areas. The results show that the infrared radiation intensity of wide detection surface of double Snozzle is less than that of the narrow detection surface, with the biggest margin up to 80 %. The infrared radiation in tensity on each probing direction is lower than that of axisymmetric convergent nozzle, espe cially on the probing direction between 30° and 40° in the wide detection surfaces, and the infrared radiation intensity of double Snozzle is lower 30% than that of axisymmetric con vergent nozzle.