CFD에 의한 수평축 풍력터빈의 공력해석에 관한 연구
A Study on Aerodynamic Analysis of HAWTs by CFD
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참고문헌
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초록
최근 관심이 급증하고 있는 풍력발전용 터빈의 효율적 설계기법의 확립 및 검증을 위해 상용 CFD 코드의 적용성 평가를 수행하였다. 상용 CFD 코드의 경우, 이미 다양한 분야에 걸쳐 그 적용 타당성을 검증 받은 바 있으나, 실제 풍력발전용 로터 블레이드 유동 및 성능해석에 대해서는 최근 들어 서서히 적용되기 시작했다. 상용 CFD 코드를 적용한 로터 후류 유동해석결과와 블레이드 표면 박리현상들은 NREL(National Renewable Energy Laboratory)의 결과와 TU-Delft의 BEM(Blade Element Method)에 의한 성능해석 결과와 상당히 유사한 결과를 나타낸다.
Abstract
The purpose of this 3-D numerical simulation is to evaluate the application of a commercial CFD code to predict 3-D flow and power characteristics of wind turbines. The experimental approach, which has been the main method of investigation, appears to be its limits, the cost is increasing with the size of the wind turbines, hence most observation are limited to the phenomena on rotor blades. Therefore, the use of Computational Fluid Dynamics (CFD) techniques and Navier-Stokes solvers are considered a very serious contender. The flow solver CFX-TASCflow is employed in all computations in this paper. The 3-D flow separation and the wake distribution of 2 and 3 bladed Horizontal Axis Wind Turbines (HAWTs) are compared to Heuristic model and smoke-visualized experimental result by NREL(National Renewable Energy Laboratory). Simulated 3-D flow separation structure on the rotor blade is very similar to Heuristic model and the wake structure of the wind turbine is good consistent with smoke-visualized result. The calculated power of the 3 bladed rotor by CFD is compared with BEM results by TU-Delft. The CFD results, which are somewhat consistent with BEM results, have an error less than 10%.
참고문헌 (5)
- "Current Developments in Navier-StokesModelling of Wind Turbine Rotor Flow", pp.367~372 (2001)
- "A Review of Wind TurbineWake Research at TUDELFT" (2001)
- "AEA Techno -logy Engineering Software."
- "Inviscide Stall Model", pp.466~469 (2001)
- "A FreeVortex Model of the Wake of a HAWT", pp.131~165 (1990)