Effects of Coolant Flow Rate Ratio on the Full Film Cooling Characteristics of Three-dimensional Turbine Guide Vane
In order to study the effects of the coolant mass flow rate ratio on the full film cooling characteristics of a three-dimensional turbine guide vane with different mainstream turbulence intensities,the full film cooling effectiveness of a three-dimensional turbine guide vane model were measured using transient liquid crystal technique.The mainstream turbulence intensities are 1%and 15%,and the coolant flow rate ratios are 5.5%,8.4%and 12.5%.The results show that the effects of the flow rate ratio on the film cooling characteristics are different in different regions and mainstream turbulence intensities.Under low mainstream turbulence intensity condition,the film cooling effectiveness generally increases with flow rate ratio increasing,however,the film cooling effectiveness in the mid region of the suction side and the top region decreases in high flow rate ratio,and the coolant distribution on the mid chord region of suction side appears to be wavy.The high mainstream turbulence enhances the mixing of mainstream and coolant,which restrains the lift-off of the coolant from the vane surface and makes the coolant distribution uniform.
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