난류모델 변화에 따른 블레이드 팁 영역의 공력성능예측 정확도 평가에 관한 연구 = A Study on the Prediction Accuracy of the Aerodynamic Performance of a Blade Tip Region According to Various Turbulence Model Changes

다국어 초록 (Multilingual Abstract)

In this study, the prediction accuracy of the aerodynamic performance of the RANS and DES turbulence models through 3-D unsteady CFD analysis under high Reynolds number conditions were compared and analyzed for NACA64-618 airfoils. Numerical simulations were performed by applying the Reynolds Averaged Navier-Stokes (RANS)-based turbulence model and Detached Eddy Simulation (DES) model, and the simulation results were compared with wind tunnel test results. The realizable k-ε turbulence model failed to predict the flow separation point and the size of the recirculation region, resulting in very low aerodynamic performance, and the S-A turbulence model showed a characteristic of over-predicting the drag coefficient after the stall point. The SST K-ω γ-Re-θ model and the DES model had excellent prediction accuracy in drag coefficient at a low angle of attack and lift coefficient after stall angle of attack. When comparing two turbulence models in terms of computational efficiency, it is recommended to apply the SST K-ω γ-Re-θ model.

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