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反向蒙特卡罗(BMC)法的计算精度高、适应性强,是计算目标红外辐射特征的常用方法。基于CFD和IR综合计算分析的方法,研究了射线步长、射线数、射线携带能量方式等因素对BMC法计算航空发动机红外辐射强度的效率的影响。结果表明:射线步长与喷管出口当量直径比在0.05~0.1的范围内,射线数达到105量级时的计算效率较高;采用射线携带多个波段能量的方法,计算时间可缩短数十倍;通过MPI平台实现了并行计算,进一步缩短BMC法的计算时间,但并行效率随着计算核心的增加而下降。在保证计算精度的前提下,通过合理地选择参数、算法改进和并行计算,提高了计算效率。
The inverse Monte Carlo (BMC) method has high computational accuracy and adaptability and is a common method to calculate the target infrared radiation characteristics. Based on the methods of CFD and IR, the influence of BMC method on the efficiency of aeroengine infrared radiation is studied, such as the ray step length, the number of rays and the radiation energy carrying method. The results show that the ratio of the radiation step length to the nozzle outlet diameter is within the range of 0.05 to 0.1, and the computational efficiency is high when the radiation number reaches 105 orders. The calculation time can be shortened by tens with the method of carrying multiple bands of radiation The parallel computation is realized by MPI platform to further shorten the calculation time of BMC method, but the parallel efficiency decreases with the increase of computation core. Under the premise of ensuring the accuracy of calculation, the computational efficiency is improved by reasonably selecting the parameters, algorithm improvement and parallel computing.