Experimental study on the heat transfer in the compound cooling passage

An experimental study was carried out to comprehend the passage configuration for better the cooling effectiveness on the trailing edge of high-pressure turbine blade. Thermochromic liquid crystal technology was employed to measure the endwall temperature of the trapezoidal compound passage and the resistance coefficients of the internal ducts. It can be concluded that the configuration with suitable ejection holes in the divider wall can get higher heat transfer coefficient of the compound passage than that of the tradition configuration with a straight divider wall which form a sharp turn. This is because the spanwise impinging jets flowing through the orifices distributed at the radial orientation in the divider wall between the first passage and the second one, can improve the heat transfer of a certain low heat transfer region. Better effectiveness of heat transfer could be obtained when the straight divider wall was designed into zigzag divider wall.