有无气膜冷却双钟形喷管内流动特性研究
Investigation of Flow Characteristics inside a Dual Bell Nozzle with and without Film Cooling
摘要：
在这项研究中，我们进行了二维轴对称模拟，以评估流动特性和了解薄膜冷却过程中的双钟形喷嘴。在喷管壁面3个不同的轴向位置注入低温二次流，模拟了二次流注入位置对双钟形喷管气膜冷却的影响。冷却效果通过喷嘴壁面上的温度和压力分布或分离点的移动来证明。喷射点下游的马赫数和温度分布记录了主流和二次流的混合。观察到的拐点区域是最有希望的位置为二次流的注入。进一步研究了二次流马赫数的影响。本文的研究表明，可以通过二次喷射（马赫数）来控制双钟形喷管的分离点，从而获得最佳的推力。
英文摘要：
In this study, we perform a two-dimensional axisymmetric simulation to assess the flow characteristics and understand the film cooling process in a dual bell nozzle. The secondary stream with low temperature is injected at three different axial locations on the nozzle wall, and the simulations are carried out to emphasize the impact of injection location (secondary flow) on film cooling of the dual bell nozzle. The cooling effect is demonstrated through the temperature and pressure distributions on the nozzle wall or, in-turn, the separation point movement. Downstream of the injection point, the Mach number and temperature profiles document the mixing of the main flow and secondary flow. The inflection region is observed to be the most promising location for the injection of the secondary flow. We have further investigated the effect of Mach number of the secondary stream. The current study demonstrates that one can control the separation point in a dual bell nozzle with the help of secondary injection (Mach number) so that an optimum amount of thrust can be achieved.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
