摘要
低雷诺数下,利用圆柱绕流尾迹模拟上游叶片尾迹的方法,实验研究了上游尾迹扫掠对高负荷低压涡轮叶栅端区二次流和叶型损失的影响,并对尾迹与端区二次流相互作用的物理机制进行了数值研究。尾迹扫掠能显著抑制端区涡系结构,尾迹中的正负涡团与轮毂通道涡相互作用交替进行,端区二次涡在整个周期内的时均值降低。此外,尾迹扫掠具有很强的两面性,一方面尾迹扫掠可以抑制叶片吸力面分离,但也会增大掺混损失,调整好恰当的尾迹扫掠频率,可以最大限度地提升涡轮的气动性能。
At low Reynolds number,incoming wakes were produced through moving rods upstream of the cascade.The effects of upstream wakes on endwall secondary flow and profile losses within the high-lift LPT cascade were researched by experiment,and the interaction mechanisms between the upstream wakes and secondary flow were studied by numerical simulation.Upstream wakes can significantly suppress endwall secondary vortical structures.The interaction between vorticity of the wakes and the passage vortex decrease the time-averaged result of the secondary vortex in an upstream wake-passing period.Additionally,upstream wakes have both positive and negative effects on the flow of LPT.The periodic wakes can decrease the size of the separation bubble,but increasing mixing losses.If appropriate wakes passing frequency was chose,aerodynamic performance of turbine cascade can be improved more.
作者
屈骁
张燕峰
卢新根
朱俊强
QU Xiao;ZHANG Yan-Feng;LU Xin-Gen;ZHU Jun-Qiang(Key Laboratory of Light-Duty Gas-Turbine,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Science,Beijing 100049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2019年第9期2004-2011,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51876202,No.51836008)
关键词
低雷诺数
高负荷低压涡轮
端区二次流
尾迹周期性扫掠
实验研究
low Reynolds number
high-lift Low-pressure turbine
secondary flow
periodic wake
experimental investigation
