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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.
In order to study the characteristics of the solid rocket motor sneaking into the nozzle back wall, a cold simulation experimental device was designed. The display of the back wall area was carried out by using the display technology with the addition of extraneous smoke and the tablet light illumination, and the images were recorded with the camera and the camera The results show that vortexes are easily formed in the dorsal wall under the conditions of high Reynolds number, large penetration, and concave arc surface of submerged part of nozzle. At the same time, numerical calculation of internal flow field is carried out for the experimental conditions, Compared with the calculation results, the two have good qualitative consistency.