论文部分内容阅读
针对某采用气膜冷却的燃烧室在设计工况运行时喷管喉道内温度非正常升高所导致的烧蚀故障,该文基于有限体积方法数值模拟燃烧室内的流场,分析烧蚀的原因并提出改进方法。研究发现,冷却气膜在一个较大旋涡诱导作用下被卷入燃烧室中心区,导致喉部处局部温度非正常升高至2252K,从而将内壁烧蚀。通过改变冷却气体的流量和进入燃烧室的入流方向,能使喷管喉部温度降低500K以上,从而降低了发生烧蚀的可能性。该文还得到了最佳冷却效率的冷气入流方向角为60°～70°。
Aiming at the ablation failure caused by the abnormal increase of the temperature in the throat of a nozzle during the operation of a combustion chamber with gas film cooling, the flow field in the combustion chamber is numerically simulated based on the finite volume method, and the reason of ablation And put forward the improvement method. The study found that the cooling gas film was involved in the center of the combustion chamber under a large vortex induced pressure, causing the local temperature in the throat to increase abnormally to 2252K, which ablated the inner wall. By changing the flow of cooling gas and the direction of inflow into the combustion chamber, the nozzle throat temperature can be reduced by more than 500K, reducing the likelihood of ablation. The paper also obtained the best cooling efficiency of the inflow direction angle of air-cooled 60 ° ~ 70 °.