螺旋桨/机翼相互干扰的非定常数值模拟

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.

Unsteady numerical simulation of propeller/wing interaction

Unsteady numerical simulation was conducted to study distributed propeller slipstream problem of solar unmanned aerial vehicle based on structured/unstructured hybrid grid CFD methods. Wing was segmented to eliminate the influence of finite span three-dimensional effects and simplify the research object, and the sliding mesh and transition model were applied in the numerical simulation; then the conditions of propeller in front of or behind the wing were discussed and compared with pure wing and pure propeller. The result shows that propeller in front of or behind the wing makes wing lift, drag and nose-down pitching moment increase and fluctuate periodically, while propeller behind the wing has less impact on the wing. The wing causes propeller thrust, absorbed power and efficiency increase and fluctuate periodically, while non-uniformity of flow field results in vibration of peopeller.