Research on Film Cooling Flow Simulation Approach based on Jet-flow Method
In order to study the accuracy of jet-flow method for film cooling flow simulation,a certain aero engine turbine mid-span cascade was used as research object,mixing losses and mass flow change of cooling injection and main gas stream under different blade positions,jet angles and hole diameters were analyzed and compared with real cooling film hole calculation result.Simulation results show that at dif-ferent blade positions,jet-flow model can accurately capture the changes in flow losses on the pressure side and front section of the suction surface with a maximum absolute deviation of total pressure loss of 0.02%,meanwhile,a significant deviation is observed on the rear section of suction surface by the jet-flow method.Comparative results at different elevation angles and hole diameters indicate that the simpli-fied jet-flow method tends to underestimate the actual flow loss near the outlet of film hole due to the lack of accurate simulation of the kidney-shaped vortex of film outlet.As the injection flow develops,the mix-ing loss of cooling flow and mainstream flow along the flow direction becomes the dominant factor,the simplified jet-flow method can accurately predict the changes of relative pressure losses,including posi-tion of the loss peak.
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