Passive Control of Laminar Separation Bubble with Spanwise Groove on a Low-speed Highly Loaded Low-pressure Turbine Blade  

作　　者：Hualing Luo Weiyang Qiao Kaifu XuCollege of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China 

出　　处：《Journal of Thermal Science》2009年第3期193-201,共9页热科学学报（英文版）

摘　　要：LES (Large-Eddy Simulation) computations were preformed to investigate the mechanisms of a kind of spanwisegroove for the passive control of laminar separation bubble on the suction surface of a low-speed highly loadedlow-pressure turbine blade at Re = 50,000 (Reynolds number, based on inlet velocity and axial chord length).Compared with the smooth suction surface, the numerical results indicate that: (1) the groove is effective toshorten and thin the separation bubble, which contributes the flow loss reduction on the groove surface, by thinningthe boundary layer behind the groove and promoting earlier transition inception in the separation bubble; (2)upstream movement of the transition inception location on the grooved surface is suggested being the result of thelower frequency at which the highest amplification rate of instability waves occurs, and the larger initial amplitudeof the disturbance at the most unstable frequency before transition; and (3) the viscous instability mode ispromoted on the grooved surface, due to the thinning of the boundary layer behind the groove.

关 键 词：larger-eddy simulation  laminar separation bubble  transition passive control  spanwise groove  high lift  low-pressure turbine 

分 类 号：TK403[动力工程及工程热物理—动力机械及工程]