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- OpenAccess
Numerical Investigation of Unsteady Effect of Upstream Wake on the Cooling Flow
摘要
Increasing turbine inlet temperature is one of the common ways to improve the aero engine efficiency and film cooling is an effective method to decrease the blade surface temperature. However, the mixing process between the main flow and the cooling flow has a great influence on the turbine aerodynamic performance. A typical turbine cascade model was selected to investigate the unsteady effect of upstream wake on the cooling flow. Results showed that the upstream wake can effectively reduce the mixing loss induced by velocity difference between the main flow and the cooling flow. The mixing loss induced by velocity difference is decreased due to the reduction of the main flow local velocity when the upstream wake hit the blade. The mixing loss induced by velocity difference increases gradually with the increase of wake width. Meanwhile, the difference between the maximum and minimum value of the mixing loss induced by velocity difference is decreased with the increase of wake sweep frequency. The induced vortex of kidney vortex is suppressed when the upstream wake hit the blade surface. The strength and size of the induced vortex is reduced with the increase of wake width.
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