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)

서지정보

· 발행기관 : 한국풍력에너지학회
· 수록지 정보 : 풍력에너지저널 / 12권 / 3호 / 88 ~ 94페이지
· 저자명 : 이근석, 임희전, 김범석

초록

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.

영어초록

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.

참고자료

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