固体火箭发动机裂纹流场的数值模拟

固体推进剂表面裂纹在对流燃烧的作用下可能会引起裂纹扩展,即使裂纹不扩展,它也增加燃烧表面积,影响发动机燃烧室流场分布,因此,确定裂纹内的压强变化情况及裂纹内火焰传播情况,无论对于裂纹扩展的研究还是对于发动机整个燃烧室内流场的研究都具有重要的意义.采用NND差分格式,对含裂缝推进剂裂纹内的燃气压强随外界条件的变化情况和裂纹内部火焰传播情况进行了仿真计算,得到了不同增压梯度,不同裂纹尺寸情况下,固体火箭发动机裂纹内流场的分布情况,并分析总结出不同因素对裂纹流场的影响规律.

Numerical Simulation on the Cracks Flow of the Solid Rocket Motor

The surface cracks of solid propellant may extend while they are affected by convective burning.Even if the cracks do not extend,they lead to the increase of burning surface which can affect the flow field in combustion chamber.So it is of great significance to confirm the change of pressure and the status of flame spread while research the crack extension and the whole flow field in combustion chamber.The NND scheme to compute the flow field in crack cavity for the solid rocket engine in different pressure increasing rates and that with different geometry shapes are given,and the laws of different factors influencing on the cracks flow field are obtained.