桨叶剖面旋涡发放数值模拟研究

Numerical Simulation Research on Vortex Shedding of Blade Section

基于任意拉格朗日—欧拉方法(ALE),根据某发生唱音问题的螺旋桨的实际数据,截取螺旋桨在0.7R处的桨叶剖面为研究对象,建立该剖面与流体相互作用的三维单层网格有限元模型,并对桨叶剖面的旋涡发放现象进行研究,然后将旋涡发放频率的数值计算结果与经验公式结果和实测结果进行对比,重点分析了桨叶剖面的结构响应。数值模拟结果表明,桨叶剖面叶背和叶面都产生旋涡脱落现象,数值计算得到旋涡发放频率与实测值接近,桨叶结构存在应力集中区域,应力集中的位置和峰值变化规律与旋涡发放现象有关。

Based on Arbitrary Lagrangian-Eulerian method （ ALE）, according to the actual data of certain sound problems of screw propellers, a three-dimensional single gridding finite element model is established by taking the screw propeller blade section at 0.7R and the vortex happening at the blade section is studied. The numerical calculation results, experience formula results and actual measurement of vortex shedding frequency are compared with an emphasis on blade section structure response. The numerical calculation results show that vortex dropping happens on both the back of the blade section and blade surface ; vortex shedding frequency and actual measure are close by the numerical calculation; there exists stress concentrating area in blade structure; the stress concentrating locations and peak value change regulations are related with vortex shedding.