舰面流场对直升机着舰时悬停操纵的影响

用N-S方程对某型军舰舰面流场流态进行了初步的数值模拟,采用实验数据修正计算结果,并将计算得到的流场叠加到某无人直升机旋翼流场中,初步研究了由于机库等钝体存在而引起的“陡壁”效应对直升机舰面起降时操纵量的影响。最后的计算结果表明,飞行甲板上方由于机库存在引起的垂向气流及其分布对舰载直升机悬停操纵特性影响较大,而侧向分量影响较小。文中着重建立适于工程应用的甲板流场计算简化方法,以用来方便地确定甲板流场和无人直升机着舰时的操纵需求,也可用于舰载直升机起降包络线计算来指导舰载直升机飞行训练

Analysis of Unmanned Helicopter Hovering in Ship Flow Field over Flight Deck

An N S equation with finite element method is used to simulate the flow field over the flight deck of a middle sized ship, and then the flow field is added to mathematical model of an unmanned helicopter. How to simplify the calculation of the flow field and how much affection of the wake on the helicopter trim when it is hovering over the deck are specially investigated, excluding the interface between rotor wake and board wake. It is a simple model for helicopter/ship dynamics. The vertical component of the flow has a very important effect on the helicopter, while the horizontal component is ignored. The result may be used in flight training and in deciding the control requirement of an unmanned helicopter hovering over the flight deck, and also in the design of the control law for an unmanned helicopter during taking off and landing.