Experimental investigation of the impact of a propeller on a streamwise impinging vortex
Experimental investigation of the impact of a propeller on a streamwise impinging vortex
复制标题
DOI：
10.1016/j.ast.2017.07.017
复制
发表时间：
2017-10
影响因子：
5.6
通讯作者：
Yannian Yang;T. Zhou;A. Sciacchitano;L. Veldhuis;G. Eitelberg
中科院分区：
文献类型：
--
作者：
Yannian Yang;T. Zhou;A. Sciacchitano;L. Veldhuis;G. Eitelberg
本文以翼尖涡撞击螺旋桨为例，利用粒子图像测速技术研究了螺旋桨对翼尖涡的影响。在桨叶附近的流场中，即在螺旋桨上游的一个平面和在螺旋桨下游的一个平面上，比较了螺旋桨对旋涡的影响。螺旋桨下游涡流的弯曲比螺旋桨上游增加了大约一个数量级。下游涡流的环流与上游涡流处于同一水平，这意味着下游涡流仍有可能影响更下游的机体。由于涡冲击在螺旋桨的不同径向位置，拉伸效应取决于螺旋桨的局部推力，这与涡冲击定常机翼的情况不同。本征正交分解分析表明，螺旋桨上游流场的第一、二阶模态是由桨叶通过引起的，而第三、四阶模态是由旋涡弯曲引起的。
By employing a wing-tip vortex impinging onto a propeller, the impact of the propeller on this vortex is studied with the help of Particle Image Velocimetry measurements. The effects of the propeller on the vortex are compared in the flow fields in the vicinity of the blades, i.e. one plane upstream and one plane downstream of the propeller. The meandering of the vortex downstream of the propeller increases by approximately one order of magnitude with respect to that upstream of the propeller. The circulation of the downstream vortex is at the same level as the upstream vortex, and this means the downstream vortex still has the potential to influence the airframe further downstream. As the vortex impinges at different radial positions of the propeller, the stretching effect depends on the local thrust of the propeller, which is different from the case with a vortex impinging on a steady wing. The Proper Orthogonal Decomposition analysis shows that the first and second modes of the flow upstream of the propeller are induced by the blade passing, whilst the third and the fourth modes are induced by the vortex meandering.