固发羽流流场及辐射特性随飞行状态的变化规律

Variation law of flow field and radiation characteristics of solid plume with flight state

为了探讨火箭不同飞行状态对发动机羽流流场结构及辐射特性的影响,对不同飞行高度、来流马赫数以及实际飞行轨迹进行了研究,分析了流场的温度分布以及辐射特性的规律.首先利用FLUENT模拟了不同飞行状态下固体火箭发动机羽流复燃流场,然后分别使用Mie理论和HITEMP数据库结合全光谱K分布模型计算了羽流的固相和气相辐射物性参数,最后通过广义源项有限体积法计算了不同飞行状态下固发羽流在波长范围为1.5~5.5μm下的光谱辐射强度.结果表明:在来流马赫数相同时,随着飞行高度的增加,羽流辐射强度也随之增加;而在同一飞行高度下,来流马赫数增加时,羽流辐射强度会随之减小;在模拟火箭的实际飞行过程中,随着时间的推移羽流辐射强度随之减小,达到一定飞行高度后,羽流复燃效应不明显,羽流辐射强度变化趋于平缓.

To investigate the influence of different flight conditions of the rocket on the plume flow field structure and radiation characteristics of the engine,different flight altitudes,incoming flow Mach numbers,and actual flight trajectories were studied,and the temperature distribution and radiation characteristics of the flow field were analyzed.First using the FLUENT software to simulate the different flight state of flow field of solid rocket motor plume again,then respectively using Mie theory and HITEMP database combined with the full spectrum of K distribution model to calculate the radiation plume solid phase and gas phase physical parameters.Finally,the spectral radiation intensity of the solid plume in the wavelength range of 1.5 to 5.5μm was calculated by the generalized source term finite volume method under different flight conditions.The results show that at the same incoming Mach number,the plume radiation intensity increases with the increase of flight height.At the same flight height,the plume radiation intensity decreases with the increase of inlet Mach number.During the actual flight of the simulated rocket,the plume radiation intensity decreases with the passage of time.After reaching a certain flight height,the plume reignition effect is not obvious,and the plume radiation intensity changes gradually.