CAJ | 학술논문

文章采用滑移网格技术对垂直轴5叶片阻力型风力机的瞬态流场进行了数值模拟计算，首先通过对计算区域出口边界上风速的数值分析，得到了恰当的计算区域大小；分析了风车输出功率随风车所处位置的变化规律，确定了风车在计算区域中的合理位置，以及此时风车的风能利用率；并进一步通过改变叶片宽度，得到了优化的叶片宽度及相应的风能利用率。结果显示，对于风轮半径为2 m、叶片宽度为0．76 m的5叶片风力机风车，在风速为6 m/s时，当风力机转速为12 r/min其功率达到最大，且风能利用率为19．3％；对于相同风轮半径的风车，优化的叶片宽度为0．8 m，并且在风速为8 m/s时，其风能利用率在转速为17 r/min状态下达到最大值24．3％。
문장채용활이망격기술대수직축5협편조력형풍력궤적순태류장진행료수치모의계산，수선통과대계산구역출구변계상풍속적수치분석，득도료흡당적계산구역대소；분석료풍차수출공솔수풍차소처위치적변화규률，학정료풍차재계산구역중적합리위치，이급차시풍차적풍능이용솔；병진일보통과개변협편관도，득도료우화적협편관도급상응적풍능이용솔。결과현시，대우풍륜반경위2 m、협편관도위0．76 m적5협편풍력궤풍차，재풍속위6 m/s시，당풍력궤전속위12 r/min기공솔체도최대，차풍능이용솔위19．3％；대우상동풍륜반경적풍차，우화적협편관도위0．8 m，병차재풍속위8 m/s시，기풍능이용솔재전속위17 r/min상태하체도최대치24．3％。
The numerical simulation on the transient flow field of 5-blade vertical axis resistance type wind turbine (VAWT)was performed by using sliding meshes.The suitable numerical model for computing the wind-power utilization coefficient was obtained by comparing the mesh size effect firstly;the proper region size for the computation was determined by comparing the outlet wind speed with respect to the infinitely distant one;and the appropriate position for the turbine was determined by comparing the position effect on the wind-power utilization coefficient rationally.Furthermore,the optimized width of blades was attained to improve the wind power utilization coefficient.The results show that the maximum power utilization coefficient is 19.3%at wind speed 6 m/s and the rotation rate 12 r/min for the turbine′s radius 2 m and the width of blades 0.76 m;the wind power utilization coefficient can reach to 24.3% at the wind speed 8 m/s and the rotation rate 17 r/min for the optimized width of blades 0.8 m.