水平轴风力机失速延迟特性及其力学机理的研究

PREDICTING STALL DELAYED PERFORMANCE OF ROTATING HAWT AND ITS INHERENT MECHANICAL DRIVING FORCES

建立简化的风力机模型,研究了风力机叶片翼型表面的压力分布及升力系数的分布,并与静态实验数据相比较,成功模拟了旋转所造成的失速延迟现象。通过计算离心加速度和哥氏加速度在叶片表明边界层内的分布,在叶片展向不同位置,两者在数量上具有相同的量级,但是哥氏力的大小与失速程度有关。比较两者对翼型失速延迟作用的差异,从数量上解释了三维翼型形成展向流的原因和失速延迟的机理。

A conceptual HAWT analysis model was proposed to predict flow＇s pressure distribution upon blade surfaces and the lifting forces along blade span under stalling conditions. Compared with 2D static measured data, delayed stall is captured with evident phenomenon and exhibited the validated model analysis ability. From the results it is also shown that along blade profile Coriolis force has the same magnitude to centrifugal force, and its direction may vary with the stalled level of relative flow. Different levels of both forces along blade span result in varied spanwise boundary flow pattern. Three dimensional delayed stall can then be explained in quantity for rotating HAWT blade profile.