Influence of the widest position of tip winglets on compressor cascade characteristics at Mach number 0.7
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摘要:
为了研究压力面叶尖小翼叶顶最宽位置变化对压气机叶栅叶顶泄漏流动的影响，对加装1.5倍叶片宽度的压力面叶尖小翼在节距方向上的最宽位置进行研究，叶尖小翼最宽位置分别位于叶片的10%至90%轴向弦长处，间隔为20%轴向弦长，进而分析了不同最宽位置小翼方案对压气机叶栅叶顶间隙流场的影响。研究结果表明：叶尖小翼最宽位置在轴向弦长上的改变对流场调控效果有直接影响，其中小翼最宽位置位于10%轴向弦长的PW0.1c方案使总压损失增加了2.39%，最宽位置位于70%轴向弦长的PW0.7c方案对流场的改善效果最为明显，总压损失降低了1.56%。
Abstract:To investigate the impact of the variation in the widest position of the tip winglets on the leakage flow at the blade tip of the compressor, the widest position of the pressure surface tip winglets in the circumferential direction with an addition of 1.5 times the blade width was studied. The widest positions of the tip winglets were located at 10% to 90% of the axial chord length of the blade, with intervals of 20% of the axial chord length. Subsequently, the effects of different widest position tip winglets schemes on the clearance flow field at the compressor blade tip were analyzed. The results showed that: the change of the widest position of the tip winglet on the axial chord length had a direct influence on the flow field regulation effect. PW0.1c scheme with the widest position of the winglet at 10% axial chord length increased the total pressure loss by 2.39%, while PW0.7c scheme with the widest position at 70% axial chord length had the most obvious improvement effect on the flow field, reducing the total pressure loss by 1.56%.
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图 3 叶栅出口截面总压损失系数分布图
Figure 3. Distribution of total pressure loss coefficient at the cascade exit position
图 7 不同叶尖小翼方案的总压损失系数变化率
Figure 7. Variation in total pressure loss coefficient with different tip winglet schemes
图 8 不同叶尖小翼方案的出口截面总压损失系数分布云图
Figure 8. Distribution of total pressure loss coefficient at the exit section with different tip winglet schemes
图 11 出口截面总压损失系数沿叶高分布
Figure 11. Distribution of the total pressure loss coefficient along the blade height at the section
表 1 叶型气动及几何参数
Table 1. Aerodynamic and geometric parameters of cascade
参数 数值 叶片弦长b/mm 40 叶片轴向弦长c/mm 34.64 叶片高度h/mm 100 节距t/mm 30 叶片几何进气角/（°） 46.23 叶片安装角/（°） 60 叶顶间隙尺寸τ/mm 2 
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