Calculation and Analysis of Shipboard Helicopter Aero-elastic Response Using CFD Method on Ship-deck

Abstract

The shipboard helicopter is in a harsh environment,which can cause the accidents of rotor tip over-swing and body collision.The research on the aero-elastic response on the ship surface of the helicopter can prevent such accidents.The computational fluid dynamics(CFD)method is used to obtain the data of ship flow field.Combining with blade dynamic model,a comprehensive calculation and analysis method of rotor aero-elastic response is proposed,and the aero-elastic response of the rotor under different inflow speed,hovering position and wind direction is studied.The results show that the proposed aero-elastic response calculation and analysis method is correct.The maximum response of rotor tip is increased with the increase of ship inflow speed.When the speed is changed from 20 m/s to 40 m/s,the response amplitude is increased by 8.35%.The hovering position mainly can affect the distribution of tip displacement response along the azimuth angle of the rotor disc.The change of inflow wind direction angle significantly affects the aeroelastic response of the rotor.The maximum flapping displacement of the blade tip is related to the vertical velocity distribution of the ship's wake flow field.The greater the change gradient is,the greater the maximum flapping of the blade tip is.

Keywords

• shipboard helicopter
• ship flow field
• aeroelastic response
• cfd