尾部附体对超空泡航行器弹道振荡特性的影响OA

During high-speed navigation of a supercavitating vehicle,the unsteady evolution of the wake flow field and the strong cavity-rigid body coupling can induce complex ballistic oscillations,which severely limits its high-speed stability and motion controllability.The configuration of tail appendages is critical for regulating oscillation characteristics and improving dynamic stability.To reveal the mechanism of tail appendages on the oscillation characteristics of supercavitating vehicles,numerical simulations were conducted to investigate the unsteady motion characteristics under high-speed straight navigation conditions.Based on the VOF multiphase flow model,Schnerr-Sauer cavitation model,and Realizable k-ε turbulence model,a four-degree-of-freedom numerical model coupling the flow field and vehicle motion was established.The unsteady motion characteristics of three configurations,namely non-appendage,four-rudder,and twin vertical rudder layouts,were compared and analyzed.The results show that the trajectory of the non-appendage supercavitating vehicle presents typical"conical-like"oscillation characteristics,with a period of 0.079 5 s,an attitude angle oscillation amplitude of approximately 1°,and a phase difference of about 1/4 period between pitch and yaw.The tail hydrodynamic loads on the four-rudder configuration are significantly increased,the trajectory period is shortened to 0.073 s,and the attitude angle oscillation amplitude is about 2°.The twin vertical rudder configuration exhibits significant dynamic asymmetry.The vertical rudders effectively suppress yaw oscillation,but the pitch angle oscillation amplitude increases to 1.5° with a trajectory period of 0.079 6 s.The research results can provide a theoretical basis for the optimal design of the rudder system and attitude stability control of supercavitating vehicles.