Using Thermal - Fluid Coupling Method Internally Cooled Turbine Blade Heat Transfer Calculations

The heat transfer of turbine blade with inner cooling was numerical studied. The calculation model of exterior flow, blade structure and cooling flow were established and the temperature fields of balde were obtained. Actually, the condition on the interface between flow field and structure was unknown, it should be determined by the dynamic process of heat transfer. Against above problem, heat-flow coupling method was presented and adopted in this paper.Two cases were simulated to validate the heat-flow coupling method. The first one was a 2-D laminar flow around a flat plate with blunt leading edge, the numerical calculation and the analytic results agreed well. The second case were two kinds of blade, C3X and MarkII, both with radial cooling tubes, the prediction showed well compared with experimental data.Based on the above validation, some blade was computed for three different cooling solutions: solid blade(no cooling), blade with eight cooling tubes, blade with cooling cavity, by heat-flow coupling method. Radiation was taken into account.The study showed that solving the heat transfer problem of turbine blade by heat-flow coupling method was feasible and effective. The paper provided valuable references for engineering application.