Numerical studies on film cooling performance of turbine vane leading edge with counter-inclined structure

Numerical studies were performed for the film cooling performance of counter-inclined film-hole rows, presenting advantage in manufacturing relative to the usually used parallel-inclined film-hole row structure, on a turbine vane leading edge model. Two types of counter-inclined film-hole rows were studied, including collinear counter-inclined film-hole row and non-collinear counter-inclined film-hole row. The distributions of film cooling effectiveness and heat transfer coefficient were obtained for the blowing ratios of 0.5, 1.0, 1.5 and 2.0. The effect of hole pitch on the film cooling effectiveness and heat transfer coefficient was also studied. Results show that the film cooling performance of counter-inclined film-hole rows is not weakened compared with the traditional parallel-inclined film-hole row structure. The film cooling effectiveness of the two counter-inclined film-hole row structures decreases with the increase of blowing ratio, while the heat transfer coefficient increases. The change of inclination structure of film-hole row has very little effect on the heat transfer coefficient in the downstream region, while the increase of hole pitch can influence the values of heat transfer coefficient as well as the film cooling effectiveness in a relatively notable way.