摘要
利用滑移网格法,数值研究了周期性来流扰动对通气超空泡航行体流体动力特性的影响,通过上游两片水翼反向摆动使下游流场产生水平速度周期性变化的来流条件,分析来流扰动对航行体空泡形态及流体动力的影响。在周期性水平来流作用下通气超空泡截面发生颈缩现象,航行体易产生沾湿区域影响空泡减阻效果;分析了航行体在周期性来流扰动下的流体动力变化规律,发现当航行体被空泡完全包裹时,阻力呈现周期性波动,升力较小;当航行体被空泡局部包裹时,升力和阻力都会产生较大波动。通过沾湿面积比率分析周期性来流的波长和波幅对空泡形态的影响规律,为空泡在扰动环境中的稳定性研究奠定了基础。
The influence of periodic inflow disturbances on the hydrodynamic characteristics of ventilated supercavitating vehicles was studied by using the sliding grid method.Two hydrofoils were arranged to swing in opposite directions at the front of the computational field in order to produce an inflow condition of horizontal velocity periodical fluctuation.The influence of periodic inflow on the multiphase flow of the ventilated vehicle was investigated.The results show that:under the influence of periodic horizontal flow,the cross-section of the ventilated supercavitation will shrink,and the vehicle is prone to produce wetted areas,which will affect the drag reduction effect of cavitaty.The changes of hydrodynamic characteristics of the vehicle under the action of periodic inflow were analyzed,and it is found that when the vehicle is completely wrapped by the cavity,the resistance presents periodic fluctuation and the lift becomes small.When the vehicle is partially wrapped by the cavity,the resistance will be reduced due to the fluctuation of the flow velocity,and the lift will fluctuate greatly.The influence of the wavelength and amplitude of the periodic inflow on the cavity shape was analyzed according to the wetted area ratio.The influence of the wavelength and amplitude of the periodic inflow in the horizontal direction on the shape of the ventilated cavity was also given.
作者
何广华
杨豪
王威
朱一舟
潘雁甲
HE Guanghua;YANG Hao;WANG Wei;ZHU Yizhou;PAN Yanjia(School of Ocean Engineering,Harbin Institute of Technology,Weihai 264209,China;Shandong Institute of Shipbuilding Technology,Weihai 264209,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第10期16-22,共7页
Journal of Vibration and Shock
基金
哈尔滨工业大学(威海)科研创新基金(HIT.NSRIF.202017)
山东省泰山学者工程专项经费(tsqn201909172)
山东省高等学校青创科技支持计划(2019KJN003)。
