Volume 39, Number 5, October 2021
|Page(s)||1087 - 1096|
|Published online||14 December 2021|
Investigation on effects of time-frequency characteristics of ship airwake on helicopter flight characteristics
China Helicopter Research and Development Institute, Jingdezhen 333001, China
A conventional helicopter flight dynamics model, which can be coupled with ship airwake date, is developed in this study. In the method, the ship airwake data is obtained by the high-accuracy DES model, and a strategy which can transmit CFD data to the flight dynamics model is established based on the "one-way" coupling idea. Then, the SFS2 ship model and UH-60A helicopter are chosen as a combination to investigate the influences of the spatial and temporal characteristics of ship airwake from the aspects of control margins and unsteady level. The time-averaged simulation results show that for the counterclockwise-rotor helicopter, although pilot could have more collective pitch margin under crosswind condition compared to the headwind condition, he might possess much less pedal margin due to the sidewash in the airflow. The unsteady results indicate that the unsteady loading level of the helicopter would increase significantly under the crosswind condition compared to the headwind condition due to the increase of turbulent density in the airwake. Furthermore, for the conventional helicopter, the disturbances on the forces and moments which along the rotor hub (i.e., thrust and yaw moment) are the critical factors that increasing the pilot workload during the landing procedure.
Key words: helicopter / ship airwake / flight dynamics model / control margin / unsteady level
关键字 : 直升机 / 舰船流场 / 飞行动力学 / 操纵余量 / 非定常水平
© 2021 Journal of Northwestern Polytechnical University. All rights reserved.
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