自循环机匣喷嘴喉部高度对转子性能的影响研究

Study on the Influence of the Throat Height of the Injector of the Self-circulating Treatment Casing on the Rotor Performance

以NASA Rotor 37为研究对象,采用数值模拟的方法对自循环机匣处理内部的循环流量对转子性能的影响展开了研究,通过调节自循环机匣的喷嘴喉部高度来实现对循环流量的调控.研究发现,喷嘴喉部高度对自循环机匣处理的扩稳效果有着重要的影响,随着喷嘴喉部高度的变大,转子的失速裕度改进量呈现出先缓慢增加,再急剧提升,最后增势又趋于平缓的三种变化趋势。此外,不同喷嘴喉部高度的自循环机匣处理后转子的效率均有所下降。效率下降的原因主要来源于从喷嘴喷射出的高速射流加剧了叶顶流场的掺混损失和黏性耗散损失,从而造成了转子叶顶区域存在大面积高损失区域,使得转子效率下降。且随着喷嘴喉部高度的增大,气流内部黏性耗散程度越大,对转子效率造成的影响也越大.

Taking NASA Rotor 37 as the research object,the influence of the circulating mass flow rate of the self-circulating treatment casing(SCT)on the rotor performance was studied by numerical simulation method.The regulation of the circulating mass flow rate was realized by adjusting the injector throat height of the self-circulating treatment casing.It is found that the injector throat height has an important influence on the enhancing stability effect of the self-circulating treatment casing.As the injector throat height increases,there are three trends that the stall margin improvement of rotor increases slowly,then sharply increases,and finally increases to be flat.In addition,the efficiency of the rotor after the self-circulating treatment casing of the different injector throat heights has decreased.The reason for the decrease in efficiency is mainly due to the mixing loss and viscous dissipation loss of the blade tip exacerbated by the high-speed injecting from the injector,resulting in high loss area in the rotor tip region,which causes the rotor efficiency to decrease.And as the throat height of the injector increases,the greater the internal viscous dissipation of the flow,the greater the impact on the rotor efficiency.