Transactions of Nanjing University of Aeronautics & Astronautics
Heat Transfer Coefficient of Film Cooling with EllipseShaped Tab
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Abstract:
The enhanced cooling performance caused by ellipse-shaped tabs located at the outlet of the film cooling holes is conducted. Three covering ratios of ellipse-shaped tabs on film holes and four blowing ratios are studied. The results show that:(1)The heat transfer coefficient ratio is higher than that without tab, indicating that the mixing of mainstream and coolant jet provides a better coverage film on the cooling wall, but increases the local turbulence production which enhances the heat transfer coefficient; (2) When the ellipse-shaped tabs are located at the film hole outlet, there is a larger pressure drop with the ellipse tab relative to the no-tab case. Thus, the discharge coefficient with ellipse tab is lower than that without tab.
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