Analysis Of Influencing Factors Of Coupled Flow Field Of The Helicopter Rotor And Ship Deck

With its unique hovering characteristics and ultra-low-altitude flight capabilities,shipborne helicopters can be used to perform a variety of maritime missions.In the landing area behind the ship’s hangar,the airflow will generate turbulence due to bypassing the superstructure of the ship,and it will be coupled with the rotor downwash flow field,which will negatively affect the rotor and other apron flow fields,making the ship The operation difficulty of the ship’s pilot is much greater than that in the land-based environment.Accurate calculation and analysis of the coupled flow field between the helicopter and the ship has a good guiding role in reducing the occurrence of accidents during the landing phase.This thesis uses numerical simulation method to model the ship deck and rotor together.By using FLUENT software,under different wind directions,different hover heights,hangar door opening and closing conditions,different hover positions,different hover rotors In terms of quantity and other conditions the coupled flow field of the rotor and the ship deck was numerically calculated.The effects of wind direction angle,hover height,hangar door switch,hover position and rotor number on the coupled flow field structure,turbulent kinetic energy analysis and deck flow field velocity were obtained.The results of the study show that: When the hover height is low,the effect of rotor turbulence near the hangar is more obvious.The speed fluctuations in three directions are very large.As the hover height increases,the rotor flow field affects the ship’s flow field.It becomes weaker and weaker,the vortex near the deck gradually weakens or even disappears,and the speed fluctuation near the hangar gradually becomes gentle,indicating that the higher the hover height,the less the disturbance of the airflow near the deck area near the hangar.The difference in the hovering position of the rotor has a large difference in the affected area.When the rotor is hovering at the front apron,the speed near the hangar increases significantly,and the speed fluctuation is also large,while the speed fluctuation in the area away from the hangar is small;When the rear apron is hovered,the velocity distribution in the front area of the deck is relatively stable,while the velocity of the flow field near the rear apron changes greatly.The opening of the hangar door can reduce the intensity of the vortex near the hangar,but at the same time it will also increase the intensity of the airflow inside the hangar.Flowing lines near the door caused the impact.When the wind direction is different,the side steps of the hangar make the air flow more turbulent,and the vortex structure is closer to the hangar.At the same time,downstream of the stern,the turbulence of the airflow intensified,and the structure of the ship’s flow field was different.Compared with the single-rotor hovering on the front apron,the simultaneous hovering of the two rotors will cause a large change in the flow field at the rear of the deck.The influence range of the rotor on the ship’s deck flow field is limited,only affecting the flow field near the rotor speed.