Experimental Investigation on Film Cooling and Aerodynamic Loss Performance Of Turbine Vanes with Fan-Shaped and Wave-Trenched Holes

•Opposite trends in film effectiveness between fan-shaped and wave-trenched holes are observed at different blowing ratios.•Wave-trenched holes exhibit double peaks of film cooling effectiveness on vane pressure surface at low blowing ratio.•Different patterns of vortices downstream of wave-trenched holes on suction and pressure surfaces are observed.•Wave-trenched holes have higher shear stress rate and total pressure loss on vane suction surface at high blowing ratio.