Turbulent dynamics in a linear compressor cascade
The increase of the thrust/weight ratio of aircraft engines is extremely restricted by different three-dimensional loss mechanisms.One of them is the corner separation that forms at the junction between the blade suction side and the hub or shroud.Although some works previously investigated the mechanisms and the parameters of corner separation,it is still difficult to propose an effective control method of corner separation.That is mainly due to two reasons:(i)the lack of knowledge of the physical mechanisms,(ii)the nowadays classical RANS turbulence models are not capable to accurately predict corner separation,since they cannot correctly describe turbulent transport mechanisms.In this paper,RANS and LES simulations are presented on a compressor cascade configuration using NACA 65 blade profile(blade chord based Reynolds number is about 3.82 × 105),in comparison with experimental data obtained at LMFA(from separate works).The RANS approach globally over-estimates the corner separation,whereas a significant improvement is achieved with the LES using the shear-improved Smagorinsky model(SISM)as subgrid-scale model,especially for the blade surface static pressure coefficient and the total pressure losses.The turbulent dynamics,including velocity spectrum,unsteady turbulent structures and turbulent anisotropy characteristic,are then analyzed in detail.
Corner separation Linear compressor cascade Large-eddy simulation Turbulent structures
Feng Gao Gherardo Zambonini Wei Ma Jér(o)me Boudet Xavier Ottavy Lipeng Lu Liang Shao
Laboratoire de Mécanique des Fluides et dAcoustique,Ecole Centrale de Lyon,69134 Ecully,France;Scho Laboratoire de Mécanique des Fluides et dAcoustique,Ecole Centrale de Lyon,69134 Ecully,France School of Aeronautics and Astronautics,Shanghai Jiao Tong University,200240 Shanghai,China School of Energy and Power Engineering,Beihang University,100191 Beijing,China
国际会议
The 5th International Symposium on Jet Propulsion and Power Engineering(第五届喷气推进与动力工程国际会议)
北京
英文
1-13
2014-09-15（万方平台首次上网日期，不代表论文的发表时间）