CAJ | 학술논문

风力机叶片是使风能转化为机械能的原动机构，是风力机的重要部件．风力机风能利用系数的高低主要取决于其叶片的做功能力．针对直叶片垂直轴风力机使用的NACA0022翼型，在翼型尾缘处开1 mm宽的窄缝，沿弦线方向喷气，以期改变流场进而提高风力机风能利用系数．利用Fluent软件采用k-ωSST湍流模型和SIMPLE算法，运用滑移网格技术，对风力机进行数值计算．得到采用尾缘喷气叶片的风力机的风能利用系数增大，而且处于高风能利用系数的尖速比范围更宽；在尖速比为2．06时其风能利用系数最高，其值为22．4％，此时的风能利用系数较基本型时提高了15．5％．叶片尾缘喷气提高风机性能的物理机制是尾缘喷气的扰动向上游传递改变了大攻角情况下叶片的表面压力系数．
풍력궤협편시사풍능전화위궤계능적원동궤구，시풍력궤적중요부건．풍력궤풍능이용계수적고저주요취결우기협편적주공능력．침대직협편수직축풍력궤사용적NACA0022익형，재익형미연처개1 mm관적착봉，연현선방향분기，이기개변류장진이제고풍력궤풍능이용계수．이용Fluent연건채용k-ωSST단류모형화SIMPLE산법，운용활이망격기술，대풍력궤진행수치계산．득도채용미연분기협편적풍력궤적풍능이용계수증대，이차처우고풍능이용계수적첨속비범위경관；재첨속비위2．06시기풍능이용계수최고，기치위22．4％，차시적풍능이용계수교기본형시제고료15．5％．협편미연분기제고풍궤성능적물리궤제시미연분기적우동향상유전체개변료대공각정황하협편적표면압력계수．
The rotor of wind turbine is a driving mechanism , and it is the important component of wind tur-bine .Aerodynamic performance of a wind turbine lies on airfoil of the blade .Keeping the baseline airfoil of NA-CA0022 usually used in vertical axis wind turbine , we made a 1 mm wide slot in the tail of blade in order to get better performance of the wind turbine .Vertical axis wind turbines were simulated numerically , the k-ωSST turbulence model and SIMPLE algorithm were chosen , and sliding mesh technique was applied .The coefficient of power of the VAWT by trailing edge blowing of the blade is larger , and the range with better aerodynamic per-formance widens.When the tip speed ratio equals 2.06, the coefficient of power is largest .The largest CP e-quals 22.4%, which increases by 15.5% in contrast to baseline case .The mechanism of optimum is that the passive jet from the slot can alter the coefficient of pressure on the surface of blade at large attack angle .