CAJ | 학술논문

为提高 Savonius 风力机叶轮的风能转化效率，提出椭圆叶片 Savonius 风力机叶轮方案，并通过非定常流体动力学数值计算分析了不同尖速比下叶片扁度对叶轮的气动特性的影响。计算基于雷诺时均的 N-S 方程，湍流模型采用RNG k-ε模型，利用滑移网格技术模拟叶轮的转动，通过网格无关性和湍流模型验证分析验证所采用数值方法的有效性。研究结果表明：随着扁度减小，叶片最大力矩系数增加，而最小力矩系数减小；扁度为0.72的叶轮的最大平均功率系数最大(0.2650)，相比常规Savonius叶轮增加5.84%。
위제고 Savonius 풍력궤협륜적풍능전화효솔，제출타원협편 Savonius 풍력궤협륜방안，병통과비정상류체동역학수치계산분석료불동첨속비하협편편도대협륜적기동특성적영향。계산기우뢰낙시균적 N-S 방정，단류모형채용RNG k-ε모형，이용활이망격기술모의협륜적전동，통과망격무관성화단류모형험증분석험증소채용수치방법적유효성。연구결과표명：수착편도감소，협편최대력구계수증가，이최소력구계수감소；편도위0.72적협륜적최대평균공솔계수최대(0.2650)，상비상규Savonius협륜증가5.84%。
A modified Savonius wind turbine with elliptical blades was introduced with the aim of increasing the power efficiency of the turbine. The influence of the blade ellipticity on the turbine performance was investigated with a transient computational fluid dynamics (CFD) method over a range of tip speed ratios. The numerical simulation was based on the Reynolds averaged Navier-Stokes (RANS) equations and the renormalization group k-εturbulent model was utilized. The numerical method was validated with existing experimental data. The results indicate that: the maximum blade torque increases with the blade ellipticity while the minimum blade torque changes on the contrary; the turbine with a blade ellipticity of 0.72 generates the maximum power coefficient 0.2650, which is 5.84% higher than a conventional Savonius turbine.