基于PIV技术的纵列式双旋翼尾迹特性实验研究
Experimental investigation on the wake characteristics of tandem twin rotors
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摘要: 将现有单旋翼实验台进行改装,以适合于纵列式双旋翼的实验研究。基于PIV技术,针对悬停和前飞状态下的纵列式双旋翼时的桨尖涡特性进行了测量。通过改变前后旋翼的水平和轴向间距,调整两旋翼之间的重叠区域,研究了不同气动布局纵列式双旋翼干扰状态下的尾迹结构,并与单旋翼进行了对比。结果表明:悬停状态,随两旋翼纵向间距的增加,桨尖涡的轴向位移也逐渐增大,但桨尖涡径向位移并不是随纵向间距的改变而规律变化,在纵向间距为1.8R附近时最小;而双旋翼轴向间距的变化对桨尖涡的径向和轴向位移均有影响,但变化都不是很大。Abstract: Element Free Galerkin(EFG) method is intensive computation due to the requirement of background cells quadrature, and may appear nonphysical oscillations in solving convection dominated problems. To solve these problems, a local Taylor expansion integration ElementFree Galerkin (LTEIEFG) method is proposed in this paper, which based on the idea of integration for local Taylor expansion. This method can not only save computation cost but also eliminate nonphysical oscillation in solving convection dominated problem. Numerical examples of one-dimensional convection diffusion equation and two-dimensional Burgers equation show that the LTEIEFG method is accurate and much more efficient than EFG method.