潜入喷管背壁流场模拟显示

为了研究固体火箭发动机潜入喷管背壁流场的特点,设计了一种冷模拟实验装置.利用引入外加烟雾以及片光照明的显示技术进行背壁区域的流动显示,并用照相机和摄象机记录显示结果.结果表明:在雷诺数较高、潜入度较大和喷管潜入部分型面为凹弧面条件下,背壁区域容易形成旋涡;同时,针对实验条件进行内流场的数值计算,实验和计算结果相比较,二者在定性上具有良好的一致性.

VISUALIZATION OF SIMULATIVE BACK-WALL FLOWFIELD ARODND SUBMERGED NOZZLE

A cold-flow simulation experiment is accomplished, in order to study back-wall flowfield features around submerged nozzle of solid rocket motors. The visualization technique of inducting additional substance and sheet lighting are used to carry out flow visualization of the back-wall flowfield, and the results are recorded with a convertional and a television camera.The results show that it is easy to form vortex in back-wall flow field for a submerged nozzle with concave back surface and higher submerging rate under higher flow Reynolds number.Moreover, the internal flowfield is simulated through computer according to the experimental conditions. The pictures of flow visualization are in good accordance with the numerical simulation.