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力学学报  2014 

旋翼翼型动态失速流场特性PIV试验研究及L-B模型修正

DOI: 10.6052/0459-1879-13-389, PP. 631-635

Keywords: 旋翼,翼型,前缘涡,动态失速,粒子图像测速法,利什曼-贝多斯模型

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Abstract:

为测量翼型动态失速的非定常涡流场特性,采用3D-PIV技术,对典型直升机旋翼翼型SC1095的动态失速流场特性进行测量,发现涡在不同位置处的输运速度不同位于翼型表面的涡的无量纲速度为0.39,位于尾迹区的涡的无量纲速度为0.55.利用前缘涡输运速度变化这一特征,改进了经典的翼型动态失速利什曼-贝多斯(Leishman-Beddoes,L-B)模型,将该模型中固定的涡时间常数修正为可以随涡位置变化的时变函数,修正后的模型计算得到翼型法向力峰值相对原L-B模型提升5%,力矩系数负峰值相对原L-B模型提升13%,与试验值相比更加吻合,表明修正后的翼型动态失速模型更好地体现了翼型前缘涡的物理特征.

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