Application of heat transfer coefficient criteria formulas for the conjugate heat transfer analysis of a gas turbine

To save the calculating time and improve the precision of results, Dittus-Boelter criteria formula and Gnielinski criteria formula are adopted in the calculation of conjugate heat transfer analysis for the NASA-MarkII high pressure air-cooled gas turbine. Considering of the geometry and work conditions of inner-cooling channels, and by correcting the temperature difference coefficient and the entry effect coefficient, the commercial software CFX11.0 is used to simulate NASA-MarkII high pressure air-cooled gas turbine by different turbulence models. The simulation results agree well with the experimental ones. In addition, because of the application of heat transfer coefficient criteria formulas, the calculation of inner-cooling channel fluid domain, the conjugate errors of inner-cooling channel fluid domain and the solid blade domain with different turbulence models and the calculation errors of uncertain inner-cooling channel turbulence characteristic boundary conditions, are all avoided.