火箭发动机有遮挡情况的尾焰红外辐射计算

Infrared radiation calculation of rocket engine exhaust plume with shading

火箭发动机工作过程中的尾焰会产生强烈的红外辐射,对其结构及载荷有加热的效果,同时一些结构成为了遮挡物体,会影响辐射的传输。为了研究复杂的有遮挡状况下的红外辐射传输,采用反向蒙特卡洛方法,编写气体红外辐射计算程序。计算并分析标准等温流场对其表面的辐射强度,与教材算例对比,验证了红外辐射算法的有效性和正确性。针对某尾焰复燃流场,分别计算并分析尾焰流场有无遮挡两种情况下的气体红外辐射强度。并比较了遮挡物在不同形状、尺寸、位置下产生的影响。研究表明:尾焰的辐射会对发动机结构产生热影响;增加遮挡后,被遮挡区域的辐射强度数值明显减小;遮挡的形状、尺寸及位置都会对其效果产生影响。

The exhaust plume in the working process of rocket engine generates strong infrared radiation, which has a heating effect on its structure and load.At the same time, some structures become shading objects and affect the radiation transfer.In order to study the complex infrared radiation under shading conditions, this article uses the Backward Monte Carlo Method(BMCM) to compile an calculation program for the gas infrared radiation.The radiation intensity of the standard isothermal flow field on its surface is calculated and analyzed, which verifies the effectiveness and correctness of the infrared radiation algorithm by comparing with the textbook examples.For the flow field of an afterburning exhaust plume, the infrared radiation intensity of the gas in the case of the flow field with or without shielding is calculated and analyzed, respectively.In addition, the effects of shading objects in different shapes, sizes and positions are compared.The results show that the radiation of exhaust plume has a thermal effect on the engine structure.With shielding, the infrared radiation intensity of the blocked area is significantly reduced.The shape, size and position of the shielding will affect its effect.