Heat transfer coefficient and film cooling effectiveness on a full-film cooling vane

The high-resolution heat transfer coefficient and the film effectiveness measurements on a full-film cooling nozzle guide vane with compound and axial angle holes were obtained using a transient liquid crystal technique. The tests were performed in a scaled-up, two-passage cascade at an inlet Reynolds number of 1.0×10 ⁵. There are eight rows of compound angle cylinder film holes around the leading edge, 21 rows of axial angle cylinder holes on the pressure side, and 24 rows of axial angle cylinder holes on the suction side. The holes are fed from two internal plenum with a mass flow ratio of 4.56% in the first plenum and 4.67% in the second plenum. The results show that the film cover region shrinks on the suction side and expands on the pressure side due to the influence of passage vortex. The heat transfer coefficient and the film cooling effectiveness are higher in the near hole region. The heat transfer coefficient is higher and the film cooling effectiveness is lower near the leading edge. The film cooling effectiveness is about 0.4 on the suction side and about 0.35 on the pressure side, respectively.