黏性液体爆炸抛撒模型
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摘要
黏性液体爆炸抛撒模型的建立对数值模拟黏性液体爆炸抛撒形成的抛撒云团过程具有重要意义。黏性液体爆炸抛撒包含液体初始驱动、空化效应产生、液体环形成、射流形成和断裂、液滴破碎等现象,这是一个复杂的物理过程。根据不同阶段、不同现象流动特征,建立牛顿黏性流体爆炸抛撒数学模型,计算得到液体抛撒速度、抛撒半径以及液滴尺寸分布。计算结果表明抛撒半径与黏度成正比,而抛撒速度衰减曲线曲率与之成反比。为验证数学模型的准确性设计试验,试验结果与结论一致,模型准确性得到验证。
To build the model for viscous liquid explosion dispersion is of great significance to numerically simulating viscous liquid explosion dispersal process. The explosion dispersion of viscous liquid is a complex physical process including initial driving of fluid,cavitation effect,formation of fluid ring,formation and fracture of jets,droplet breakup. According to flow characteristics in different stages and different phenomena, the mathematics model of Newtonian viscous fluid's explosion dispersion was established. The liquid dispersal velocity,the fluid dispersal radius and the distribution of droplets size were obtained through calculation. The results showed that the fluid dispersal radius is proportional to the fluid viscosity,while the curvature of the fluid dispersal velocity attenuation curve is inversely proportional to the fluid viscosity. The test was designed to verify the correctness of the mathematical model. It was shown that the test results agree well with those of calculation,the correctness of the model is verified.
To build the model for viscous liquid explosion dispersion is of great significance to numerically simulating viscous liquid explosion dispersal process. The explosion dispersion of viscous liquid is a complex physical process including initial driving of fluid,cavitation effect,formation of fluid ring,formation and fracture of jets,droplet breakup. According to flow characteristics in different stages and different phenomena, the mathematics model of Newtonian viscous fluid's explosion dispersion was established. The liquid dispersal velocity,the fluid dispersal radius and the distribution of droplets size were obtained through calculation. The results showed that the fluid dispersal radius is proportional to the fluid viscosity,while the curvature of the fluid dispersal velocity attenuation curve is inversely proportional to the fluid viscosity. The test was designed to verify the correctness of the mathematical model. It was shown that the test results agree well with those of calculation,the correctness of the model is verified.
引文
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[2]薛社生,刘家骢,彭金华.液体燃料爆炸抛撒的近场阶段研究[J].南京理工大学学报,1997,21(4):333-336.XUE Shesheng,LIU Jiacong,PENG Jinhua.Study on the explosively dispersed liquid fuel in the near-field[J].Journal of Nanjing University of Science and Technology,1997,21(4):333-336.
[3]薛社生,刘家骢,秦承森.燃料爆炸抛撒成雾的实验与数值研究[J].爆炸与冲击,2001,21(4):272-276.XUE Shesheng,LIU Jiacong,QIN Chengsen.Experimental and numerical investigationon explosive dispersal and cloud forming[J].Explosion and Shock Waves,2001,21(4):272-276.
[4]丁珏,刘家骢.液体燃料爆炸抛撒和FAE形成过程的数值模拟[J].南京理工大学学报,2000,24(2):168-171.DING Jue,LIU Jiacong.Numerical simulation on the process of explosive dispersal for forming FAE cloud[J].Journal of Nanjing University of Science and Technology,2000,24(2):168-171.
[5]丁珏,刘家骢,彭金华.液体燃料爆炸抛撒近场阶段的数值研究[J].爆炸与冲击,2000,20(3):215-220.DING Jue,LIU Jiacong,PENG Jinhua.Numerical study on the explosively dispersed liquid fuel in the near-field[J].Explosion and Shock Waves,2000,20(3):215-220.
[6]秦承森,王裴,王丽丽,等.液体环轴对称抛洒首次破碎的理论分析[J].爆炸与冲击,2007,27(3):198-203.QIN Chengsen,WANG Pei,WANG Lili,et al.An investigation of the primary breakup in the axisymmetric dissemination of a liquid ring[J].Explosion and Shock Waves,2007,27(3):198-203.
[7]方伟,赵省向,李文祥,等.爆炸抛撒过程中FAE云雾的运动特性[J].含能材料,2015,23(11):1061-1066.FANG Wei,ZHAO Shengxiang,LI Wenxiang,et al.Movement characteristics of fuel-air explosive(FAE)clouds in the explosion dispersal process[J].Chinese Journal of Energetic Materials,2015,23(11):1061-1066.
[8]罗琳,解立峰,韩志伟,等.柴油的抛撒成雾及燃爆特性研究[J].高压物理学报,2015,29(3):213-218.LUO Lin,XIE Lifeng,HAN Zhiwei,et al.Cloud character in explosion dispersion and combustion feature of diesel[J].Chinese Journal of High Pressure Physics,2015,29(3):213-218.
[9]吴德义.冲击波作用下液体抛撒和界面运动研究[D].合肥:中国科技大学,2002.
[10]GRADY D E.The spall strength of condensed matter[J].Journal of the Mechanics&Physics of Solids,1988,36(3):353-384.
[11]LIN S P.Breakup of liquid sheets and jets[M].The Press Syndicate of the University Of Cambridge,2003.
[12]LIN S P,REITZ R D.Drop and spray formation from a liquid jet[M].Annu.Rev.Fluid Mech.,1998,30:85-105.
[13]CORINO E R,BRODKEY R S.A visual investigation of the wall region in turbulent flow[J].Journal of Fluid Mechanics,1969,37:1-30.
[14]马小娟,刘福生,李一磊,等.冲击压缩下物质黏性系数与冲击波阵面扰动衰减特性研究[J].物理学报,2010,59(7):4761-4766MA Xiaojuan,LIU Fusheng,LI Yilei,et al.Quantitative relation between the viscosity coefficient of substances under shock compression and the disturbance damping of shock from[J].Acta Physica Sinica,2010,59(7):4761-4766.