Effects of endwall movement on the aerodynamic performance of cantilevered stators
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摘要:
为了探究端壁移动对悬臂静子性能的影响，对轮毂移动与否、轮毂移动速度大小以及移动轮毂情况下间隙大小对某一低速轴流压气机悬臂静子内部流动及压气机性能的影响进行了详细的研究。结果表明，随着端壁移动速度的增加或者端壁移动情况下叶根间隙的减小，静子近轮毂区域的流动堵塞/流动损失减小、压气机性能得到提升，造成这一现象的主要原因是端壁移动情况下二次流的消失以及参与掺混的泄漏流流量的减小；端壁移动也会影响静子进口流场，进而影响转子的特性，但相对于对静子特性的影响，转子特性的变化幅值较小。
Abstract:To explore the impact of endwall movement on the performance of cantilevered stators, the effects of hub movement, hub movement speed and the gap size of cantilevered stators on the internal flow and performance of a low-speed axial compressor were researched in detail. The results showed the flow blockage/loss of hub area was reduced and the compressor performance was improved with the increase of the endwall movement speed or the decrease of the gap size in case of endwall movement. This phenomenon was mainly attributable to the disappearance of the secondary flow and the reduction of the leakage flow involved in the mixing. The endwall movement also affected the inlet flow field of the cantilevered stators, which in turn affected the characteristics of the rotor. However, compared with the effect on the characteristics of the stator, the change amplitude of the rotor characteristics was relatively small.
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Key words:
- endwall movement /
- cantilevered stators /
- aerodynamic performance /
- leakage flow /
- axial flow compressor
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图 1 低速大尺寸轴流压气机实验台
Figure 1. Low-speed large-scale axial compressor experiment facility
图 5 设计工况静子吸力面极限流线
Figure 5. Limit streamline of the stator suction surface in design condition
图 6 近失速工况静子吸力面极限流线
Figure 6. Limit streamline of the stator suction surface in near-stall condition
图 7 设计工况静子出口无量纲轴向速度云图
Figure 7. Contour of dimensionless axial velocity at stator outlet in design condition
图 8 近失速工况静子出口无量纲轴向速度云图
Figure 8. Contour of dimensionless axial velocity at stator outlet in near-stall condition
图 10 设计工况静子通道内三维流场
Figure 10. Three-dimensional flow field in stator passage in design condition
图 11 近失速工况静子通道内三维流场
Figure 11. Three-dimensional flow field in stator passage in near-stall condition
图 12 设计点工况泄漏流流量变化及由泄漏流引起的堵塞区域内流量的变化
Figure 12. Variation of leakage flow and blockage region flow caused by the leakage in design condition
图 13 设计点工况由泄漏流引起的堵塞区域内流动损失的变化
Figure 13. Variation of flow loss in blockage area caused by the leakage in design condition
图 14 静子通道内三维流场结构（g=1.00τ，n=2200 r/min）
Figure 14. Three-dimensional flow field in stator passage （g=1.00τ，n=2200 r/min）
图 15 设计工况静子间隙内三维流线的发展
Figure 15. Development of three-dimensional streamlines in the stators’ gap in design condition
图 16 静子通道内三维流场结构（g=0.50τ，n=1100 r/min）
Figure 16. Three-dimensional flow field in stator passage （g=0.50τ, n=1100 r/min）
图 18 静子出口无量纲轴向速度分布
Figure 18. Dimensionless axial velocity distribution of stator outlet
图 19 静子进口无量纲轴向速度分布
Figure 19. Dimensionless axial velocity distribution of stator inlet
表 1 算例设置
Table 1. Cases settings
悬臂静子端壁
转速n/ （r/min）静子间隙g 0 0τ, 0.25τ, 0.50τ, 1.00τ, 2.00τ 1100 0.50τ, 1.00τ 2200 1.00τ 
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