| The study of flow field near helicopter's take-off and landing deck,flight characteristics of shipborne helicopter's take-off and landing,and wind-over-deck envelop have been a hot and difficult problem in the practical application field of helicopter aerodynamics and helicopter flight dynamics.In order to study the wind-over-deck envelop of a certain type of shipborne helicopter on a certain ship,the ship's flow field over the deck is studied firstly by CFD numerical simulation method.The influence of height,wind velocity and direction,the opening and closing of the ship's hangar door and some other factors on the flow field over the deck are analyzed emphatically.Then this paper combines the ship's flow field with the flight dynamics model,and develops a new coupled model for ship flow field and helicopter flight dynamics.On the basis of this model,the influence of the hover height of the helicopter,the horizontal and vertical velocity components in the ship's flow field,the hover position of the helicopter relative to the ship on the flight characteristics of the helicopter are studied.Finally,combined with theoretical analysis,domestic and foreign research,this paper puts forward a safety criterion for the wind-over-deck envelop of a helicopter's take-off and landing over a specific ship.Based on previous research contents,this paper calculates the wind-over-deck envelop,which is matched by ships and helicopters under different conditions.Moreover,the factors which affect the wind-over-deck envelop are also studied.In this paper,the efficiently coupled model of ship flow field and helicopter flight dynamics,and the calculation method of wind-over-deck envelop can capture the influence of ship flow field on the flight characteristics of helicopter and wind-over-deck envelop.It can provide reference for calculating the wind-over-deck envelop of a helicopter's take-off and landing over a ship,and then provide theoretical guidance for the helicopter's safety. |
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