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针对太阳能无人机分布式螺旋桨滑流问题,采用基于结构/非结构混合网格的CFD方法进行了非定常数值模拟.通过截取翼段消除有限翼展三维效应的影响并简化研究对象,将滑移网格和转捩模型应用于数值模拟;分别研究了螺旋桨位于翼段前方和后方的情况,并与干净螺旋桨和干净翼段进行对比.结果表明:螺旋桨位于翼段前方或后方均使得翼段升力、阻力、低头力矩增加并呈周期性波动,同时螺旋桨位于翼段后方时对翼段的影响较小;而翼段的存在使得螺旋桨的拉力、吸收功率和效率增加并呈周期性波动,流场的非均匀性导致了螺旋桨振动.
In this paper, a non-stationary numerical simulation is performed on the distributed propeller slip problem of a solar UAV by using the CFD method based on a hybrid structured / unstructured mesh. By intercepting the wing segments to eliminate the influence of the finite span spanning effect and simplifying the study object, The moving grid and transition model are applied to the numerical simulation. The propeller is located in the front and the rear of the wing section, and compared with the clean propeller and the clean wing section respectively. The results show that the propeller is located in front of or behind the wing section, The lift, drag and bow moment increase and fluctuate cyclically, while the propeller at the rear of the wing has little effect on the wing. The existence of the wing increases the tension, absorption power and efficiency of the propeller and fluctuates cyclically, Field non-uniformity causes the propeller to vibrate.