|
|
|
| Effect of rotorstator interference on film cooling at leading edge of cascade |
| 1. College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics， Nanjing， Jiangsu 210016， China；2. Jiangsu Province Key Laboratory of Aerospace Power System， Nanjing University of Aeronautics and Astronautics， Nanjing， Jiangsu 210016， China |
|
|
|
Abstract To investigate the interaction between jet flow and main flow at the leading edge of turbine blade under the influence of rotorstator interference, the differences of flow distribution and temperature distribution at the end wall, the middle section and the tip of turbine blade were compared and analyzed.The results show that with the increasing of blade height, the leading edge stagnation line is gradually shifted from the suction side to the pressure side, and the wall adherence of jet flow on the pressure side is weakened.The phenomena of "divergence", "uptrend" and "countercurrent" of jet flow are caused by rotorstator interference, and the influence on gas film coverage at central section is greater than those at root and tip.In the downstream of jet flow, the inversion of vortex pairs shows obviously asymmetric, and the strength and scale of the vortex pairs on the suction side are decreased along the direction of blade height, while the variation trend of the inversion of vortex pairs on the pressure side is opposite.The rotorstator interference can reduce the film cooling efficiency.
|
|
|
|
|
|
|
|
|
