Large Eddy Simulation and CDNS Investigation of T106C Low-Pressure Turbine

Hu, Site1; Zhou, Chao2,3; Xia, Zhenhua4; Chen, Shiyi5

2018-01

10.1115/1.4037489

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME   影响因子和分区

0098-2202

1528-901X

This study investigates the aerodynamic performance of a low-pressure turbine, namely the T106C, by large eddy simulation (LES) and coarse grid direct numerical simulation (CDNS) at a Reynolds number of 100,000. Existing experimental data were used to validate the computational fluid dynamics (CFD) tool. The effects of subgrid scale (SGS) models, mesh densities, computational domains and boundary conditions on the CFD predictions are studied. On the blade suction surface, a separation zone starts at a location o f about 55% along the suction surface. The prediction of flow separation on the turbine blade is always found to be difficult and is one o f the focuses of this work. The ability of Smagorinsky and wall-adapting local eddy viscosity (WALE) model in predicting the flow separation is compared. WALE model produces better predictions than the Smagorinsky model. CDNS produces very similar predictions to WALE model. With a finer mesh, the difference due to SGS models becomes smaller. The size o f the computational domain is also important. At blade midspan, three-dimensional (3D) features of the separated flow have an effect on the downstream flows, especially for the area near the reattachment. By further considering the effects of endwall secondary flows, a better prediction of the flow separation near the blade midspan can be achieved. The effect of the endwall secondary flow on the blade suction surface separation at the midspan is explained with the analytical method based on the Biot-Savart Law.

SCI ; EI

英语

其他

National Natural Science Foundation of China[51576003]

Engineering

Engineering, Mechanical

WOS:000415379500008

ASME

20174104252373

Aerodynamics ; Computational fluid dynamics ; Flow separation ; Forecasting ; Mesh generation ; Reynolds number ; Secondary flow ; Turbines ; Turbomachine blades ; Turbulent flow

Fluid Flow:631 ; Fluid Flow, General:631.1 ; Aerodynamics, General:651.1 ; Computer Applications:723.5

ENGINEERING

Web of Science

1.Peking Univ, Coll Engn, Beijing 100871, Peoples R China
2.Peking Univ, Coll Engn, BIC EAST, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China
3.Collaborat Innovat Ctr Adv Aeroengine, Beijing 100191, Peoples R China
4.Zhejiang Univ, Sch Aeronaut & Astronaut, Hangzhou 310058, Zhejiang, Peoples R China
5.Southern Univ Sci & Technol, Coll Engn, Shenzhen 518055, Peoples R China

Hu, Site,Zhou, Chao,Xia, Zhenhua,et al. Large Eddy Simulation and CDNS Investigation of T106C Low-Pressure Turbine[J]. JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME,2018,140(1).

Hu, Site,Zhou, Chao,Xia, Zhenhua,&Chen, Shiyi.(2018).Large Eddy Simulation and CDNS Investigation of T106C Low-Pressure Turbine.JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME,140(1).

Hu, Site,et al."Large Eddy Simulation and CDNS Investigation of T106C Low-Pressure Turbine".JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME 140.1(2018).