基于多重角度离散的排气系统红外辐射特性数值模拟

为解决有限体积法耦合求解排气系统红外辐射特性时角度离散数目不足的问题,提出多重角度离散方法,并计算了某轴对称排气系统的空腔-喷流组合红外辐射特性。用较粗的离散角度耦合计算每个喷管空腔微元面的辐射亮度,用较细的离散角度对空腔-喷流组合辐射的每个控制角进行独立计算,求解红外辐射强度。结果表明,多重角度离散方法可以使排气系统红外辐射程序在保证计算精度的同时,探测方向更加灵活,克服了有限体积法求解喷管空腔-喷流组合辐射强度分布时角度离散数目不足的问题。

Infrared Radiation Characteristic Simulation of Exhaust System Based on Multi-Angle Discrete Method

A multi-angle discrete method was proposed to solve the coupling of nozzle cavity radiation and plume radiation for finite volume method (FVM). The infrared radiation of an axisymmetric exhaust system was calculated based on the multi-angle discrete method. By calculating the nozzle cavity radiations coupling with plume using coarse discrete solid angle and infrared radiation of exhaust system separately using fine discrete solid angle, the multi-angle discrete method makes the exhaust system infrared radiation simulation code obtain more direction results. The dissertation presents that the multi-angle discrete method is appropriate for the coupled calculation of flow field and gas radiation field for exhaust system.