Effect of slot casing treatment on first stall stage of counter-rotating compressor
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摘要:
为探究缝式机匣处理对对转压气机最先失速级的影响规律，以双级对转压气机为研究对象，采用数值模拟的方法，开展了缝式机匣处理对对转压气机最先失速级的影响研究。研究表明：缝式机匣处理下该对转压气机的失速初始扰动类型仍为突尖型失速，机匣处理前移压气机的最先失速级由转子R2转换为转子R1，而机匣处理后移未改变该压气机的失速级。机匣处理前移抑制了转子R2前缘溢流的发生，降低了叶片通道内的非定常脉动强度，而转子R1在近失速工况下叶片前缘溢流加剧，主流和泄漏流的交界面被推出叶片通道，同时叶片通道内的非定常脉动强度增大，最终使得转子R1首先进入失速状态；机匣处理向转子R2下游移动，难以抑制前缘溢流的发生，虽然此时转子R1也出现了前缘溢流现象，但转子R2前缘溢流更剧烈，主流和泄漏流交界面的位置更远离叶片前缘，更容易使压气机发生失速。
Abstract:In order to explore the influence of slot casing treatment on the first stall stage of counter-rotating compressor, a two-stage counter-rotating compressor was taken as the research object. The influence of slot casing treatment on the first stall stage of the counter-rotating compressor was studied by numerical simulation method. The results showed that the slot casing treatment did not change the initial stall disturbance type of the counter-rotating compressor, which was still a spike stall. The first stall stage of the compressor was converted from rotor R2 to rotor R1 by the forward movement of the casing treatment, while the backward movement of the casing treatment did not change the stall stage of the compressor. After casing treatment, the leading edge spillage of the rotor R2 was inhibited, and the unsteady fluctuation intensity in the blade passage was reduced. However, the leading edge spillage of the rotor R1 was intensified under the near-stall condition. The interface between the mainstream and the leakage flow was pushed out of the blade passage. At the same time, the unsteady oscillation intensity in the blade passage was increased, which finally made the rotor R1 first enter the stall state. It was difficult to suppress the occurrence of leading edge spillage when the casing treatment was processed to move downstream of rotor R2. Although the leading edge spillage phenomenon also occurred at rotor R1 at this time, the leading edge spillage of rotor R2 was more intensified, and the position of the interface of the mainstream and leakage flow was further away from the leading edge of the blade, making it easier for the compressor to stall.
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Key words:
- counter-rotating /
- slot casing treatment /
- compressor stall /
- first stall stage /
- tip leakage flow
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图 5 实验和数值计算压气机总性能对比
Figure 5. Overall performance comparison between numerical and experimental results of solid casing
图 6 机匣处理前移下压气机总特性对比
Figure 6. Comparison the overall performance of compressor with forward movement of the casing treatment
图 7 机匣处理后移对转压气机总特性对比
Figure 7. Comparison the overall performance of compressor with backward movement of the casing treatment
图 10 近失速工况下转子99%叶高熵及流线分布
Figure 10. Distribution of entropy and streamlines of 99% blade span at near-stall condition
图 11 近失速工况下转子叶尖间隙泄漏流分布（时均值）
Figure 11. Distribution of blade tip leakage flow under near-stall condition （time-average）
图 12 转子叶顶间隙泄漏流轴向动量沿轴向弦长的分布
Figure 12. Distribution of the average axial momentum of the tip leakage flow of the rotor blades
图 13 转子间隙内泄漏流与轴向方向的夹角沿轴向弦长的分布
Figure 13. Distribution of the angle of the leakage flow in the rotor gap with respect to the axial direction along the axial chord length
图 14 对转压气机中泄漏流流动示意图
Figure 14. Schematic diagram of tip leakg flow in a counter-rotating compressor
图 15 近失速工况99%叶高的相对马赫数分布（70T/80）
Figure 15. Mach number distribution at 99% blade span of rotors at near-stall point (70T/80)
图 17 近失速工况下99%叶高的Su分布
Figure 17. Su distribution of 99% blade span at near stall point
图 18 近失速工况下转子99%叶高熵及流线分布
Figure 18. Distribution of entropy and streamlines of 99% blade span at near-stall condition
图 19 转子叶顶间隙泄漏流轴向动量沿轴向弦长的分布
Figure 19. Distribution of the average axial momentum of the tip leakage flow of the rotor blades
图 20 转子间隙内泄漏流与轴向方向的夹角沿轴向弦长的分布
Figure 20. Distribution of the angle of the leakage flow in the rotor gap with respect to the axial direction along the axial chord length
表 1 转子主要设计参数
Table 1. Main design parameters of the rotors
设计参数 转子1（R1） 转子2（R2） 转速N/（r/min） 8000 −8000 叶片数n 19 20 叶顶间隙τ/mm 0.5 0.5 叶尖弦长C/mm 0.0832 0.0769 叶尖速度/（m/s） 167.6 167.6 进口轮毂比 0.485 0.641 
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表 2 缝式机匣处理几何参数
Table 2. Geometry parameters of axial slot casing treatment
参数 缝式机匣处理方案 ASCT1 ASCT2 ASCT3 ASCT4 缝长（L/Ca）/% 100 100 100 100 缝宽W/mm 7.4 7.4 7.4 7.4 缝深D/mm 12 12 12 12 单通道缝数 6 6 6 6 中心偏移度 0 0.21 0.42 −0.21 W/W1 2/1 2/1 2/1 2/1
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表 3 机匣处理扩稳效果评估
Table 3. Evaluation of stability expansion effect of casing treatment
机匣处理方案 ΔSMI/% ΔPEI/% ASCT1 6.23 −2.15 ASCT2 6.15 −1.82 ASCT3 6.2 −0.99 ASCT4 5.51 −1.14
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