Rotation Effect on Flow and Heat Transfer for High-Temperature Rotor Blade in a Heavy Gas Turbine

In this paper, the composite inner cooling structures of the rotating blade in the first stage heavy gas turbine were modeled and simulated by coupling heat transfer (CHT). The flow characteristics and heat transfer performances were comparatively analyzed under two operations of the stationary and the rotational states. The results show that the turbulence intensity, the flow resistance and the heat transfer level of the rotating coolant are significantly increased compared with the stationary state, which is considered to be obtained by the combined effects of the Coriolis force, the centrifugal force and their derived buoyancy forces. It is pointed out that the rotation leads to the non-uniform flow of film holes at the leading edge of the pressure surface along blade height. In addition, it increases the slope of the limiting streamline, which has a decisive influence on the heat transfer of both the pressure and suction surfaces. The paper provides guidance for the design of a rotating composite cooling structure based on the relations between the stationary and rotational conditions.