科研之友
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摘要
Film cooling is an effective and widely used cooling method in industrial turbine. The heat transfer coefficient is one of the main characteristic of film cooling, which directly affects the wall temperature of the hot end part. The development of high-precision and high-efficiency measurement methods for the heat transfer coefficient of the film cooling is of great significance for the study of gas film cooling characteristics and cooling design. In this paper,the steady-state measurement method of flat film cooling coefficient is studied. Through the numerical simulation of Reynolds time-averaged(RANS), the influence mechanism of solid heat loss on the accuracy of the heat transfer coefficient measurement and the efficiency of the measurement process is studied. It is shown that the thickness of the back insulation material directly affects the solid heat conduction process on the back of the plate, which further leads to the influence of the accuracy of the test results and the time when the system reaches steady state(ie, measurement efficiency). For a specific film heat transfer coefficient measurement experiment, there is a range of insulation thicknesses that performs well. Based on this observation, this paper proposes a method to further balance the steadystate measurement accuracy and efficiency of the flat film cooling heat transfer coefficient.
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