Numerical And Experimental Investigation On Flow And Heat Fields In Turbine Cascade

Haibo Huang (Mechanical Engineering) Directed by Jianzhong Xu Cooling techniques in turbine have become more important since the extra high inlet temperature in turbine. To analysis the heat environment in the turbine, it's required to couple a flow solver with a conduction heat transfer solver. The flow field and the temperature field in the turbine cascade were studied in view of experiment and computation.Using the shock wind tunnel, two kinds of turbine cascade were tested. The static pressure distributions of turbine blade surface were measured under five different circumstances and heat flux distributions of turbine blade were measured under two different circumstances. The experiment's accuracy, reliability were discussed. Multi-grid-blocks, finite volume method, MacCormack difference method was used to solve the unsteady two-dimensional Navier-Stokes Equation, finite difference method was used to solve the two-dimensional heat transfer problem. The computational results given by S2DF under the same conditions of experiments agree well with the experiments data not only the static pressure distribution but also the position of shock. The comparison demonstrates the reliability of S2DF. Heat flux distribution was simulated using flow/heat transfer coupling method and was compared with the experiment result. Two good examples about conjugate heat transfer problem, one with cooling method, the other without cooling inside turbine blade were investigated. The examples demonstrate that it is very important to choose right turbulence model, grid generation method when it comes the conjugate heat transfer problem.