[关键词]
[摘要]
对不同分流叶片前缘掠角(由-20°到+20°)的跨音速离心压气机流场进行了数值模拟研究,结果表明:分流叶片掠几乎不改变压气机的堵塞流量,前掠有扩展压气机工作范围,增加失速裕度的趋势,同时使性能(压比和效率)提高,分流叶片前掠10°性能最佳,在最高效率点效率提高0.77%,压比提升0.91%。;与原压气机相比后掠与原压气机相比性能有部分下降 。分流叶片掠对主叶片的影响集中在其叶片中部,对前端低能流体的径向迁移改善效果不明显;前掠使主叶片中部压差减小,减弱了通道中横向的压力梯度,减小间隙泄漏损失,后掠使泄漏损失增加。分流叶片掠对主叶片吸力面的斜激波影响甚微,对通道中部及其两侧的低能流体作用较明显,前掠抑制了压力面侧低能流团的发展,更好的改善了通道中部的分离流动,后掠使低能流团向分流叶片前积聚,流动损失增加
[Key word]
[Abstract]
Numericalsimulation was carried out to investigate the influence ofdifferent leading edge sweep angle(from -20° to +20°) of splitter blade on the aerodynamic performancein transonic centrifugal compressor. The results showed that the sweep of splitter does not produce distinct changes in the choking mass flow rate. The operating range and stall margin slightly decreased and performance improved with aft sweep splitter blade, while forwardsweep make the opposite effect. The sweep of splitter mainly affects middle of the main blade, does not restrict the radial migrating process of the front low-momentum fluid. Forwardsweep tends to reduce the middle of the main blade pressure difference, weaken the cross-passage pressure gradient and decrease the tip leakage loss. The increase of leakage loss is due toaftsweep. The splitter sweepdoes not produce obvious changes in oblique shock wave, but there is thegreat effect on the passage low-momentum fluid. The development of low-momentum fluid is restricted at pressure surface of splitter by the forward sweep, and optimizes the passage separation flow. Low-momentum fluid accumulates in the front of splitter because of aftsweep, and increases the flow loss. Forward sweep 10°has the best performance, improved the efficiency by 0.77%andpressure ratio by 0.91% respectively.
[中图分类号]
TK14;TK421.8
[基金项目]