Enhance aerodynamic stability of a new small ducted-fan type VTOL UAV model for precision agriculture

小型风道式垂直起降（VTOL）无人机是一种有价值的精准农业新资源。它可以提供被监测农田的实时高分辨率图像，使农民能够远程检测作物和土壤状况，并以更生态谨慎和更小的足迹及时识别作物的田间和田内变化。然而，小型风道式垂直起降无人机的空气动力学特性非常复杂。EnviroDrone Ltd. （ENVD）是一家位于安大略省的私营公司，设计和制造同类最智能的无人机，以满足精确测绘作物，采石场，采石场，森林，建筑工地等的需求。最近，当设计一种新的小型管道风扇垂直起降无人机模型以服务于PA时，该公司面临着实现控制系统有效性的技术挑战，特别是在低速垂直飞行和高速水平飞行之间的过渡期间在交叉和/或湍流中。这主要是由于大迎角下升力不平衡和气动力矩对飞行条件变化的敏感性所致。郑博士在钝体空气动力学、流固相互作用和风方面有着广泛的专业知识

Small ducted-fan type vertical take-off and landing (VTOL) unmanned aerial vehicle (UAV) is a valuable new resource for precision agriculture (PA). It can provide real-time high-resolution images of monitored crop field, which allows farmers to remotely detect the crop and soil conditions, as well as to identify inter and intra-field variability in crops on time with more ecologically cautious and smaller footprint. However, the aerodynamics associated with small ducted-fan type VTOL UAV is very complicated. The EnviroDrone Ltd. (ENVD) is an Ontario-based private company which designs and fabricates the most intelligent UAVs of its kind to address the needs in accurately mapping crops, mining sites, quarries, forests, construction sites etc.. Recently, when designing a new small ducted-fan VTOL UAV model to serve PA, the company faces a technical challenge in attaining the effectiveness of the control system, particularly during transitions between low-speed vertical flight and high-speed horizontal flight in cross- and/or turbulent winds. This is mainly induced by the imbalanced lift at high angle of attack and sensitivity of aerodynamic moment to the change in flight conditions. Dr. Cheng has extensive expertise in bluff body aerodynamics, fluid-structure interaction and wind