不同雷诺数风沙来流下粒径对S809翼型性能的影响  

Influence of sand particle diameter on aerodynamic performance of S809 airfoil under oncoming flow of sand-wind with different Reynolds numbers

作　　者：韩伟[1,2] 金俊俊 李银然[1,2,3] 李德顺[1,2,3] 郑利凯 郭涛 HAN Wei;JIN Jun-jun;LI Yin-ran;LI De-shun;ZHENG Li-kai;GUO Tao(College of Energy and Power Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China;Key Laboratory of Fluid Machinery and System of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China;Wind Turbine Engineering and Technology Research Center of Gansu Province, Lanzhou Univ. of Tech., Lanzhou 730050, China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050 [2]兰州理工大学甘肃省流体机械及系统重点实验室,甘肃兰州730050 [3]兰州理工大学甘肃省风力机工程技术研究中心,甘肃兰州730050

出　　处：《兰州理工大学学报》2019年第5期62-67,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51566011);国家重点基础研究发展计划(973计划)(2014CB046201)

摘　　要：以风力机专用翼型S809为对象,采用数值模拟的方法研究不同雷诺数风沙来流下粒径对翼型性能的影响.结果表明:0.5μm颗粒绕流时紧贴翼型壁面运动,随着颗粒直径的增大,其运动轨迹逐渐偏离吸力面,且直径越大,偏移距离越远.当颗粒直径为10~50μm时,颗粒绕过前缘后开始偏离吸力面,大于50μm时,其绕流作用减弱,出现直接撞击吸力面的现象;雷诺数越大,近前缘驻点处撞击壁面的颗粒直径越小,且小攻角下撞击壁面的颗粒直径较小;各雷诺数下,50μm颗粒对翼型气动性能的影响最大;雷诺数为2×10~5时,5、50μm颗粒对气相湍动能有抑制作用,50μm颗粒的抑制作用最明显,100μm颗粒会增强气相湍动能.Taking the special airfoil S809 for wind turbine as investigation object, the influence sand parti cle diameter on aerodynamic of airfoil was investigated in case of different Reynolds numbers of oncoming flow of sand wind by means of numerical simulation. The result showed that the 0. 5-micron particles would move lightly on airfoil surface as wind flowed around the airfoil,and with the increase of particle di ameter ,the locus of the particle would gradually deviate from the suction surface of the airfoil and the lar ger the diameter was,the farther the deviation distance would be. When the particle diameter was between 10 and 50 micron, it would begin to deviate from the suction surface as soon as it passed over the leading edge and when it was lager than 50 micron, the wind flow around the airfoil would not occur any longer and the phenomenon of particle colliding onto suction surface directly would take place. The larger the Reynolds number was,the smaller the diameter of the particle colliding onto airfoil surface around stagna tion point at leading ledge would be;and the colliding particle diameter would be smaller when the angle of attack was smaller. In case of all Reynolds numbers 9 the particles with diameter of 50 micron would have the greatest influence on airfoil aerodynamic performance;When the Reynolds number was 2 X 105 9 the particles with diameter of 5 to 50 micron would have an inhibition effect on the turbulent kinetic energy of the gas phase and the inhibition of 50-micron particles would be most remarkable. However, the 100-mi- cron particles could enhance the turbulent kinetic energy of the gas phase, oppositely.

关 键 词：风力机翼型 雷诺数 颗粒直径 湍动能 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程]