周期性阵风流作用下通气超空泡的仿真研究  

Simulation Study of Ventilated Supercavity in a Periodic Gust Flow

作　　者：王威[1] 王聪[1] 杜严锋 李聪慧 WANG Wei;WANG Cong;DU Yan-feng;LI Cong-hui(School of Astronautics,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China)

机构地区：[1]哈尔滨工业大学航天学院,黑龙江哈尔滨150001

出　　处：《兵工学报》2018年第9期1772-1779,共8页Acta Armamentarii

基　　金：国家国防科技工业局基础科研项目(JCKY2013204B001)

摘　　要：建立周期性阵风流作用下的计算网格模型,得到阵风流作用下的多相流特性,并通过试验数据对比验证了该模型的正确性。基于所建立的模型,通过数值模拟研究了阵风流作用下通气超空泡的变化特性。研究结果表明:流场上游布置的阵风发生器周期性摆动可以在下游流场中产生阵风流动,阵风发生器频率越高,阵风流波长越小、波幅越大;来流速度越大,阵风流波长越大,波幅越大。流场下游的通气超空泡受到阵风流的作用发生变形,阵风发生器频率越大,超空泡变形越大;来流速度越大,超空泡形态越稳定;阵风流长波对超空泡形态的影响较短波小。空化数受到阵风流的影响而出现周期性变化,超空泡尾部泄气方式也随之出现变化,空化数变大时,超空泡尾部回射流的动量变大,影响了空泡尾部的双涡管泄气方式。A flow field model is established to obtain the multiphase flow characteristics in a periodic gust flow.The proposed model is verified by comparing with the experimental data.Based on the proposed model,the characteristics of ventilated supercavity in a periodic gust flow are numerically simulated.The results show that the gust generator with periodic oscillation flow placed upstream can produce gust flow in the downstream flow field,and the wavelength of gust flow decreases and its amplitude increases with an increase in frequency;the wavelength and amplitude increase with an increase in flow velocity.Ventilated supercavity in the downstream of flow field is deformed by the gust,and the deformation is more obvious with an increase in frequency.The shape of supercavity is more stable with an increase in flow velocity.The wavelength of gust is equal to the ratio of flow velocity to gust frequency,and the effect of long wave on the shape of supercavity is smaller than that of the short wave.The cavitation number periodically changes by the influence of gust flow,and the mode of gas leakage also changes.The momentum of the supercavity tail increases with an increase in the cavitation number,which affects the mode of gas leakage in the double vortex tube of cavity tail.

关 键 词：通气超空泡 阵风流 阵风发生器 数值模拟 

分 类 号：TJ630.1[兵器科学与技术—武器系统与运用工程] O351.2[理学—流体力学]