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采用一种预旋喷气机匣处理提高离心压气机特定转速范围内的稳定裕度.通过引气加大离心叶轮进口基元级流量降低通道堵塞,并借助回流预旋喷气改变前缘攻角抑制叶背分离是该机匣处理扩稳的主要机理.基于这样的认识,对机匣处理做了几何参数设计研究,发现轴向搭接位置、搭接长度和开槽角度是影响机匣处理性能的3个主要参数.通过几何参数的合理选取,在尽量提高80%设计转速稳定裕度的同时兼顾100%设计转速的效率.压气机部件性能试验验证了该设计方法的有效性,并观测到在低转速时,机匣处理可以同时提高稳定裕度和效率.
A pre-rotating jet box is used to improve the stability margins of a centrifugal compressor in a specific speed range, and the primary flow of centrifugal impeller is reduced by air bleed to reduce the blockage of the passage, and the leading edge angle of attack Leaf back separation is the main mechanism of the casing to deal with the stability.According to this understanding, the geometry design of the casing processing done a study and found that the axial lap position, lap length and slot angle is the impact of the casing processing performance Through the rational selection of geometric parameters, it takes into account the design speed stability of 80% design speed while taking into account the efficiency of 100% design speed.Compressor performance tests verify the effectiveness of the design method and observed At low speeds, the casing handling improves both stability margin and efficiency.