Abstract
Film cooling performance of a novel hole geometry is evaluated on a cascade vane suction surface with steady-state IR (infrared thermography) technique and compared to a baseline cylindrical hole geometry performance. As stated, the base geometry is a simple cylindrical hole design inclined at 30 o from the surface with pitch-to-diameter ratio of 3.0. The tripod hole geometry, also called an anti-vortex design, is where two side holes, also of the same diameter, branch out from the root at 15 o angle. The pitch-to-diameter ratio between the main holes for this design is 6.0. Two secondary fluids – air and carbon-dioxide – were used to study the effects of coolant-to-mainstream density ratio (DR= 0.95 and 1.45) on film cooling effectiveness. Several blowing ratios in the range 0.5 –4.0 were investigated independently at the two density ratios. Results show that the tripod hole design clearly outperforms the baseline case with overall reduced coolant usage.
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