Numerical investigation of vane cooling characteristics for heavy duty gas turbine using different coolants
In order to study the flow and heat transfer characteristics of a gas turbine guide vane cooled by different coolants, Three-dimensional numerical simulations were conducted by solving the Reynolds-averaged Navier-Stokes equations with the commercial finite-volume-solver FLUENT, a conjugate calculation technology was also applied. The computations were performed on unstructured hybrid grids created by the grid generator GAMBIT. The temperature distributions of the vane body and the cooling fluids are calculated simultaneously taking account of the outer heat transfer, the film effectiveness, the inner heat transfer, and the heat conduction in the vane body. As far as the outer heat transfer is concerned, the compressible viscous calculation and the boundary layer calculation with standard k-ε model are used. The results of steam cooling were compared with the results of air cooling based on the same model, and show that the pressure coefficient on the surface of steam-cooled vane is almost equivalent to that of air-cooled vane, but the former is lightly higher than the latter at the rear of the vane pressure surface. Steam cooling can enhance the cooling efficiency notably and make the temperature distribution of vane more uniform. When the mass flow ratio of coolant is 2.925×10-2, the average temperature of the vane surface will decrease about 50K, and the global-averaged cooling efficiency will increase about 5％ by the use of steam cooling while compared to air cooling.
turbine guide vane steam cooling air cooling conjugate heat transfer
ZHU Qiang-hua JI Hong-hu
College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing, China
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
303-309
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）