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

  • 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 nonphysical oscillations in solving convection dominated problems. To solve these problems, a local Taylor expansion integration ElementFree Galerkin (LTEIEFG) 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 nonphysical oscillation in solving convection dominated problem. Numerical examples of one-dimensional convection diffusion equation and two-dimensional Burgers equation show that the LTEIEFG method is accurate and much more efficient than EFG method.

     

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