对转压气机中机匣处理的非定常影响

为探究不同形式的机匣处理扩稳机理和损失产生区别，以某两级对转压气机（CRAC）为研究对象，通过非定常数值模拟方法开展了自循环机匣处理（SRCT）和轴向槽机匣处理（ASCT）扩稳机理的研究。结果表明：SRCT和ASCT在近失速点均显著提高失速裕度和总压比，在峰值效率点附近增加效率损失；机匣处理通过作用于叶顶泄漏流和抑制压力势流减弱转子间动-动干涉效应；机匣处理槽内流场与转子相对位置相关，转子周期性的扫掠机匣处理槽增加了轴向槽内流动的非定常性，机匣处理槽内流动掺混是效率下降的主要原因。

Unsteady effect on casing treatment in counter-rotating axial flow compressor

In order to reveal the difference between the stability enhancement mechanism and the loss of different forms of casing treatment, a two-stage counter-rotating axial flow compressor (CRAC) was taken as the research object, the stability enhancement mechanism of self-recirculating casing treatment (SRCT) and axial slot casing treatment (ASCT) was studied by unsteady numerical simulations. The results showed that both SRCT and ASCT significantly improved the stall margin and total pressure ratio at the near-stall point, and increased the efficiency loss at the peak efficiency point. The casing treatment reduced the dynamic-dynamic interference effect between the two rotors by acting on the tip leakage flow and suppressing the pressure potential flow. The flow in axial slots was related to the relative position of the rotor. The periodic sweeping of the rotor to the casing treatment slots increased the unsteadiness of flow in casing treatment slots, and the mixing of the flow in casing treatment slots was the main reason for the decrease of efficiency.