非定常流Weis-Fogh机构在零航速减摇中的应用

由于Weis-Fogh机构的仿生机构可以在零航速下产生升力,因此可以用来进行零航速减摇.基于势流理论建立的Weis-Fogh机构升力模型忽略了翼缘的分离涡对翼的作用,所以不能更好地模拟实际流场.因此基于点涡模型建立Weis-Fogh机构升力模型,并对Weis-Fogh机构张开时所产生的升力进行了数值计算.通过对有分离涡的Weis-Fogh机构升力和没有分离涡的Weis-Fogh机构升力之间的对比,发现前者产生的升力远大于后者.最后同实验数据进行了比较,证明该点涡升力模型可以更好地模拟翼上产生的升力.

Unsteady flow Weis-Fogh mechanism used for roll stabilization at zero speed

Since the Weis-Fogh mechanism can produce lifting force at zero speed,so it can be used to reduce ship roll at zero speed.The Weis-Fogh lift model,which was established according to potential flow theory,neglects the effects of separation vortexes on the leading-edge,hence it doesn't simulate flow fields better than the vortex mathematical model.To rectify this,a new Weis-Fogh lift model based on a point vortex model was developed.Lift force owing to the unfolding of the Weis-Fogh mechanism was computed through numerical calculations.A comparison was made between the lift generated by Weis-Fogh mechanisms with separative vortex and the lift by Weis-Fogh mechanisms without separative vortex.It is found that the former lift is much bigger than the latter.Finally,after comparing the lift generated from these vortex models with data from experiments,it was obvious that the point vortex model better simulates the lift produced over wings.