压气机叶栅中不同安装角肋式涡流发生器的数值研究
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摘要
为了研究肋式涡流发生器对压气机叶栅角区分离流动的控制效果,本文采用数值方法,对不同安装角度的涡流发生器方案进行了详细的研究。研究结果表明:肋式涡流发生器根部与顶部会产生两个流向涡,安装角不同时顶部流向涡会明显变换旋向,从而导致其与角区分离流的相互作用过程出现较大的不同。负安装角的涡流发生器对角区流动的作用优于正安装角方案,能较为明显地减小角区低能流体的堆积,但研究结果也表明,需合理选择负安装角,当涡流发生器与来流夹角较小时,涡流发生器产生的流向涡强度较低,无法与吸力面/端壁处的低能流体进行有效掺混,而当角度过大时流向涡强度迅速增强,与分离涡的作用方式发生较大变化,下端壁处损失剧增。
To research the control effect of rib-type vortex generator on corner separation flow in a compressor cascade, vortex generators with different stagger angles were studied through numerical simulation in this paper. The results show that there are two streamwise vortexes produced at the top and bottom position of rib-type vortex generator. The rotating direction of streamwise vortexes will change when the stagger angle changes and the interaction process between the streamwise vortex and corner separation flow will show a different feature. The vortex generators with negative stagger angle work better than the positive ones, which can obstruct the accumulation of corner flow better. The results also show the negative stagger angle value should be carefully chosen. When the angle value is too small, streamwise vortexes are too wake to be mixed with the suction side/end wall low-energy fluid effectively. When the angle value is too large, the streamwise vortexes are too strong and the interaction with the separation vortexes changes significantly, which introduce extra losses.
To research the control effect of rib-type vortex generator on corner separation flow in a compressor cascade, vortex generators with different stagger angles were studied through numerical simulation in this paper. The results show that there are two streamwise vortexes produced at the top and bottom position of rib-type vortex generator. The rotating direction of streamwise vortexes will change when the stagger angle changes and the interaction process between the streamwise vortex and corner separation flow will show a different feature. The vortex generators with negative stagger angle work better than the positive ones, which can obstruct the accumulation of corner flow better. The results also show the negative stagger angle value should be carefully chosen. When the angle value is too small, streamwise vortexes are too wake to be mixed with the suction side/end wall low-energy fluid effectively. When the angle value is too large, the streamwise vortexes are too strong and the interaction with the separation vortexes changes significantly, which introduce extra losses.
引文
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[12]吴培根,王如根,郭飞飞,等.涡流发生器对高负荷扩压叶栅性能影响的机理分析[J].推进技术,2016,37(1):49-56.
[2]陈萍萍.轴流压气机角区分离流动损失机理及流动控制策略研究[D].西安:西北工业大学,2015.
[3]陈矛章.风扇/压气机技术发展和对今后工作的建议[J].航空动力学报,2002,17(1):1-15.
[4]Lepot I,Mengistu T,Hiernaux S,et al.Highly loaded LPC blade and non-axisymmetric hub profiling profiling optimization for enhanced efficiency and stability:ASME GT2011-46261[C].British:ASME,2011.
[5]J.C.Lin,Review of research on low-profile vortex generators to control boundary-layer separation[J].Progress in Aerospace Sciences,2002,38(4-5):389-420.
[6]H.D.Taylor.The Elimination of Diffuser Separation by Vortex Generators:United Aircraft Corporation Report,No.R-4012-3[R].1947.
[7]Chima R V.Computational modeling of vortex generators for turbomachinery[C]//ASME Turbo Expo 2002:Power for Land,Sea,and Air.Amsterdam,Netherlands:American Society of Mechanical Engineers,2002:1229-1238.
[8]A.Pesteil,D.Cellier,O.Domercq,et al.CREATE:Advanced CFD for HPC Performance Improvement:ASME GT2012-68844[R].Copenhagen:ASME,2012.
[9]Hergt A,Meyer R,Engel K.Effects of vortex generator application on the performance of a compressor cascade[J].Journal of Turbomachinery,2013,135(2):021026.
[10]Diaa A M,El-Dosoky M F,Abdel-Hafez O E,et al.Secondary flow control on axial flow compressor cascade using vortex generators[C]//ASME 2014 International Mechanical Engineering Congress and Exposition.Montrea:American Society of Mechanical Engineers,2014:V001T01A069-V001T01A069.
[11]Zheng Tan,Qiang Xiaoqing,Teng Jinfang.Effects of Vortex-Vortex Interaction in a Compressor Cascade With Vortex Generators[C]//ASME Turbo Expo 2015:Turbine Technical Conference and Exposition.American Society of Mechanical Engineers,2015:V02AT37A033-V02AT37A033.
[12]吴培根,王如根,郭飞飞,等.涡流发生器对高负荷扩压叶栅性能影响的机理分析[J].推进技术,2016,37(1):49-56.