Numerical simulation of dynamic performance of trans-media unmanned vehicle during vertical take-off from water

Zhongguo Jianchuan Yanjiu

Chaosheng ZHENG¹  Lei QIU² 

[1] National Key Laboratory on Ship Vibration and Noise, China Ship Scientific Research Center,Wuxi 214082, China;Project Management Center of Naval Equipment Department, Beijing 100071, China;

关键词: trans-media unmanned vehicle;    vertical take-off;    numerical simulation;    overset grid;    dynamic fluid body interaction (dfbi);   

DOI  :  10.19693/j.issn.1673-3185.02229

来源: DOAJ

【 摘 要 】

ObjectivesThis paper aims to study the kinetic and dynamic characteristics of an trans-media unmanned vehicle during vertical take-off from water.MethodsIts dynamic performance during the trans-media process from water to air is numerically simulated on the basis of the viscous computational fluid dynamics (CFD) approach combined with the overset grid technique, multiple degrees of freedom and dynamic fluid body interaction (DFBI) motion model.ResultsThe results show that in order to pull the vehicle up, the air propeller rotation speed should be higher than the speed at the same pull force provided by a single propeller. As the main movement of the vehicle is vertically upward, the coupling of the air propeller downwash flow velocity and the fuselage of the vehicle leads to the "quick bowing" phenomenon.ConclusionsTo ensure smooth take-off, a manual or automatic control program should be added to adjust the tilt angle of the thrusters in real time during the take-off process. This study provides a powerful evaluation method for the optimal design and control of trans-media unmanned vehicle in the future.

【 授权许可】

Unknown