Effects of different incidences on surface flow and heat transfer in turbine blade

Surface static pressure and heat transfer are measured in different off-design incidences at short-duration transonic heat transfer wind tunnel, and the effects of incidence on surface pressure coefficient and heat transfer coefficient in turbine blade are summarized. The results suggest that incidence mainly affects the pressure distribution at suction side, near the leading-edge of suction surface a big inverse pressure gradient is produced when the incidence is positive. The pressure increases when incidence increases at the latter part of suction surface. When the incidence is negative there would be a inverse pressure gradient caused near the leading-edge of pressure surface. The positive incidence mainly affects heat transfer coefficient at suction surface. Heat transfer is strengthened at the region near the leading-edge of suction surface when the incidence increases. The negative incidence mainly affects heat transfer at pressure side, and the heat transfer is strengthened when incidence increases. The heat transfer coefficient distribution at larger reynolds number is nearly the same as that at smaller reynolds number.