低空急流结构变化对水平轴风力机气动性能的影响  

EFFECTS OF DIFFERENT LOW-LEVEL JET STRUCTURES ON AERODYNAMIC PERFORMANCE OF HORIZONTAL AXIS WIND TURBINE

作　　者：杨从新[1] 罗颂 李寿图 张旭耀[1] Yang Congxin;Luo Song;Li Shoutu;Zhang Xuyao(School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《太阳能学报》2020年第5期107-113,共7页Acta Energiae Solaris Sinica

基　　金：国家重点基础研究发展(973)计划(2014CB046201);国家自然科学基金(11262011)。

摘　　要：为了解低空急流结构变化对水平轴风力机气动性能的影响,以一台1.5 MW的三叶片变速变桨型风力机作为研究对象,通过数值计算的方法进行模拟,选取3组急流宽度和5组急流强度作为变化的低空急流结构特征进行研究,得到以下结论:急流宽度增加,风轮功率和推力增加,但增长率下降;急流强度增加,风轮功率和推力增加。急流宽度或急流强度增加都会使得叶片吸力面失速区扩大,流动分离线前移,但两者的影响方式不同。急流宽度或急流强度增加时,叶片各截面的压力系数增加;各截面单位展长上的法向力和切向力总趋势是随急流宽度或急流强度的增加而增加,但由于叶片的失速状况不一样,在部分截面法向力和切向力会出现与总体趋势不同的现象。急流高度作为低空急流的另一重要特征,将在未来的工作中探索其对水平轴风力机气动性能的影响。In order to explore effects of low-level jet(LLJ)structures on aerodynamic performance of horizontal axis wind turbine(HAWT),a 1.5 MW variable-pitch variable-speed three-blade wind turbine which used as the research object was investigated under 3 sets of jet width and 5 sets of jet strength that was selected as different LLJ structures,and some results were concluded:no matter jet width or jet strength increased,power and thrust of the rotor increased,but with the increase of jet width,the increasing rate decreased. Increasing of jet width or jet strength will cause the expansion of stall area of blade suction surface and forward movement of separation line,but with different impact ways. When jet width or jet strength increased,pressure coefficient of each section increased. The general trend of normal force and tangential force on unit exhibition of each section is that increased with the increase of jet width or jet strength,but because of the different stall situation,some sections performed differently. As another important feature of LLJ,effects of different jet heights on aerodynamic performance of horizontal axis wind turbine will be researched in the future work.

关 键 词：风力机 空气动力学 计算流体力学 低空急流 水平轴 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TM315[电气工程—电机]