Abstract: The effects of the pulse separation device port diameter on heating environment of thermal insulation of the first pulse chamber in a dual pulse motor were simulated. The Reynolds-average Navier-Stokes equations were solved with dual time LU-SGS iterative algorithm，AUSMPW upwind scheme，modified shear-stress-transport (SST) turbulence model which improved the capability of predicting separation. The conjugate heat transfer process was realized by keeping the heat flux on the fluid-solid interface to be consistent. The accuracy and reliability of the method and the code were verified by some experiment cases. The results show that with the increasing of pulse separation device port diameter，the local convective heat transfer coefficients of thermal insulation surface in the first pulse chamber decrease and the peak value decreases by 20.3%. Moreover，the position of the reattachment point and the peak value move upstream by 24.2% and 23.1% in average，respectively. The local convective heat transfer coefficients of thermal insulation surface in the first pulse motor increase?firstly，and?then?decrease. The local convective heat transfer coefficients are low in the recirculation zone and reach the peak value upstream of the reattachment point.

Key words: Dual pulse motor；Conjugate heat transfer；Numerical analysis

摘要： 针对双脉冲软隔层通道孔径对双脉冲发动机I脉冲燃烧室热防护层热环境的影响开展了数值仿真研究。对雷诺平均Navier-Strokes方程采用了双时间步LU-SGS迭代方法、AUSMPW迎风格式以及适合模拟分离流动的改进剪切应力输运(SST)湍流模型进行求解，通过保证流固耦合界面上的热流密度连续来实现耦合传热仿真。采用算例验证了算法及程序的精度和可信度。计算结果表明: I脉冲燃烧室热防护层表面的对流换热系数随软隔层通道孔径的增大而减小，最大对流换热系数平均减幅达20.3%，再附着点位置和对流换热系数最大值所在位置均向上游移动，分别平均移动24.2%和23.1%；I脉冲燃烧室热防护层表面的对流换热系数先增大后减小，且回流区内的对流换热系数相对较小，并在再附着点上游达到最大值。

关键词: 双脉冲发动机；耦合传热；数值分析