论文部分内容阅读
为更深入认识超声叶栅流动机理,以ARL-SL19、CM-1.2和SM-1.5叶栅为研究对象,采用数值模拟和理论分析相结合的方式开展喉道对超声叶栅激波结构和性能影响的研究。研究结果表明:超声叶栅存在两种稳定工作状态,起动状态和溢流状态;在来流马赫数较高时,叶栅只工作于起动状态;在来流马赫数较低时,叶栅只工作于溢流状态;存在一个马赫数区间,叶栅的工作状态由前一个状态决定;对于低马赫数C形超声叶栅,高压比下气动喉道起决定因素;对于高马赫数S形超声叶栅,真实喉道起决定因素;若为气动喉道导致溢流,溢流实现更大的裕度和更低的损失,进口马赫数和气流角会受压比影响;若为真实喉道引进的溢流,溢流会降低裕度并增加损失,叶栅保持唯一进气角流动,但进口气流角和马赫数与起动状态不同。
In order to further understand the flow mechanism of ultrasonic cascades, taking ARL-SL19, CM-1.2 and SM-1.5 cascades as the research object, numerical simulation and theoretical analysis are combined to analyze the structure and performance of the ultrasonic vibration cascades Impact studies. The results show that there are two stable working states, starting state and overflowing state of the blade cascade. When the Mach number is high, the blade cascade only works in the starting state. When the Mach Mach number is low, Work in the overflow state; there is a Mach range, the working state of the cascade from the previous state decision; for low Mach C-shaped ultrasonic cascade, high pressure ratio pneumatic throat play a decisive factor; for high Mach S-shaped ultrasound Cascades, real throat play a decisive factor; if the pneumatic throat caused overflow, overflow to achieve greater margin and lower losses, the inlet Mach number and the angle of flow will be pressure ratio; if the real throat The introduction of overflow, overflow will reduce the margin and increase losses, cascades to maintain a single intake angle of flow, but the inlet flow angle and Mach number and the starting state is different.