Analysis Of Ship Flow Field And Investigation Of Transient Aeroelastic Response Control Of Shipboard Rotors

Shipboard helicopters can fulfill various missions such as scout and rescue,anti-submarine anti-ship,amphibious assault,airborne warning,electronic warfare and mine warfare.However,the shipboard helicopters taking off or landing on ship decks can frequently encounter hostile aerodynamic environments,which can seriously threaten the flight safety for helicopters.This work concentrated on the analysis of flow field for ships and shipboard rotors,and investigation of transient aeroelastic response control for shipboard rotors during engagement operations.The research status of the flow field for coupled shipboard rotors and the shipboard rotors dynamics were introduced firstly at the first chapter in this paper.Then the purpose of the research was expounded,and the research methods to be adopted were presented.The numerical model for the flow field of the isolated ship was established in the chapter 2.Then,the numerical model for the coupled flow field for the shipboard rotor based on the momentum source method was established.Finally,the numerical simulation method and the momentum source method were validated to be effective and reliable.Next,the numerical simulations of the flow field for isolated ships and the coupled flow field for shipboard rotors based on the momentum source method were conducted in the chapter 3.The influence of the ship superstructure and the direction of wind on the flow field for the isolated ships and the shipboard rotors,the influence of various wind velocity on the flow field for the isolated ships and the effect of the position of hovering rotors and the conditions of the hangar door on the coupled flow field for shipboard rotors were analyzed and discussed.According to the characteristics of the coupled flow field for shipboard rotors,the flow control method for the coupled flow field for shipboard rotors was proposed.Reasonable selecting the jet method can effectively control the coupled flow field by calculation and analysis.Then,the simulated experiment system for the shipboard rotors during engagement operations was designed in the fourth chapter.The experiment system can simulate the flow field for ship deck,the coupled flow field for shipboard rotors and the dynamic phenomenon for transient aeroelastic response of the shipboard rotors during engagement operations.The wind tunnel test of the flow field for the ship deck was conducted to investigate the influence of the direction of wind on the flow field for the ship deck again.In the fifth chapter,The transient aeroelastic response of a shipboard rotors during engagement operations was investigated and analyzed,and the transient aeroelastic response control of a shipboard rotors by active Gurney Flaps and adding jet flow device on the hangar door was investigated.Finally,the main work of this paper was summarized,and the innovation points of this paper were presented.The work in the future was looked forward.