Abstract
This research applied the large eddy simulation(LES) to the turbine nozzle with the fan-shaped cooling hole and investigated the flow field around the cooling hole installed on the nozzle vane. To this end, the numerical analysis using commercial software was performed, and time averaged LES results were compared with results of Reynolds averaged Navier-Stokes (RANS). From these results, it was confirmed that LES predicted that the temperature on the pressure side is lower than RANS and that of the suction side is higher. This is the reason that LES produces the flow characteristics which RANS does not represent. At the pressure side, LES captured the flow moved from the cooling hole outlet to the inside the hole. Therefore, discharged coolant is closer to the vane surface and the temperature predicted by LES is lower than RANS. At the suction side, because LES depicted the separation around the cooling hole outlet, the coolant lifted off and the temperature on the vane surface was higher than RANS.
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