摘要
本实验在风力机叶片叶型表面头部加入平均质量流量为零的一定频率的振荡射流。PIV(Particle Image Ve- locimetry)实验手段显示出叶片上表面速度场。通过对加入振荡射流前后速度场和涡量场的观察与比较,可以发现在振荡射流的作用下,叶片上表面尾端的流动分离发生了再附,转捩点向后推移。通过比较还可以发现在加入特定的频率和强度的振荡射流之下,该效果更加明显。该实验不仅可以证明振荡射流可以提高叶片升力,而且显示了不同频率的射流对流动的影响。
The oscillating jet whose mean mass flux is zero is added at the loading edge of the suction surface of wind turbine blade airfoil in this experiment. PIV(Particle Image Velocimetry) measurement reveals the velocity field on the upper surface of the blade. By comparing the flux and vortex fields between two cases which bears oscillating jet or not, the flow attach to the rear part on the suction surface of the blade again, the transition point is delayed. It is realized that such effects are more noticeable under some certain frequencies and intensities. Not only the effect of increasing lift by the oscillating jet is proved by the experiment, but also the influence on the flux of the rear part under different cases of jet.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第4期590-592,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划项目资助(No.G1999022306)
关键词
振荡射流
风力机
推迟分离
PIV
转捩
oscillating jet
wind turbine
separation delay
PIV
transition.
