The annular aerostat with light gas is studied in this paper. The aerodynamic characteristics of high attitude turbine is investigated by using numerical simulation. The finite volume method is used to solve incompressible Navier-Stokes equations. The S-A model is also applied to simulate the flow field of turbine. The aerodynamics of aerostat is described in terms of airfoil, installation angle, slenderness ratio, Reynolds number and the turbine. The effects of configuration on the aerodynamic of aerostat after bringing in buoyancy are analyzed. The simulation results show that the bigger the cross section bending of the airfoil of the aerostat is, the smaller the maximum lift-to-drag ratio is; the bigger the cross section thickness of airfoil of the aerostat is, the stronger the three-dimensional effect is. The attack angle increases with the increasing of the installation angle, which leads to the advance of the appearance of maximum lift-to-drag ratio. The resultant lift-to-drag ratio curve increases and moves forward obviously after bringing in buoyancy. The smaller the slenderness ratio of the aerostat is, the bigger the lift coefficient becomes. The appearance of maximum lift-to-drag ratio will be lagged with the increasing of slenderness ratio. Based on the change of the wind velocity, the resultant lift-to-drag ratio decreases rapidly first and then tend to decreasing gently after bringing in the buoyancy. However, based on the change of the aerostat size, the lift-to-drag ratio of the aerostat increases with the increasing of Reynolds number. The drag of the aerostat increases and the lift of the aerostat decreases with the increasing of turbine rotate speed.
Chinese Quarterly of Mechanics
turbine rotate speed