Analysis On Heat Transfer Of Blade With Internal And Film Cooling Based On Pipe-Net Method

As a high-performance,advanced transition mechinery,gas turbine has a wide range of applications(covering military power and civil functions)and is of strategic importance.Developing gas turbine performance means an increase in gas turbine inlet temperature and,therefore,turbine blade heat load.In this premise,the turbine blade cooling structure design has become an essential step in the development of gas turbines technics.The pipe-net method is a one-dimensional numerical simulation method which can simplify the cooling flow path and obtain the flow and heat transfer characteristics of whole network.As a result,the pipe-net method is widely used in cooling blades heat transfer analysis.Internal ribbed channels and film cooling are highly mature blade cooling techniques,and their importance in blade cooling structures is self-evident.In this paper,an internal cooling analysis program based on pipe network algorithm is developed.The feasibility and accuracy of the program are verified by comparing the experimental data of Mark II blade under certain experimental conditions and the results of other program.Afterwards,the coupling algorithm of the one-dimensional pipe network program and the three-dimensional analysis software FLUENT is constructed by using the scheme script,and the calculation results meets well with those of three-dimensional simulation obtained under the same conditions.Finally,the verified coupling algorithm is used to simulate the modified Mark ? blade ribbed channels scheme and the film cooling scheme separately.The results showed that under the same gas consumption condition,the rib channels scheme and the film cooling scheme respectively reduced the surface temperature of the blade in the affected range by 40 K and 30 K,which representing obvious cooling effect.