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| Numerical simulation of head-on binary collision of droplets in gas phase environment |
| Received:May 08, 2013 Revised:May 22, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201501023 |
| KeyWord:droplet head-on collision VOF method numerical simulation |
| Author | Institution |
| 刘泽军 |
解放军信息工程大学 导航与空天目标工程学院, 郑州 ;国防科学技术大学 航天科学与工程学院, 长沙 |
| 张超 |
解放军信息工程大学 导航与空天目标工程学院, 郑州 |
| 武丽丽 |
解放军信息工程大学 导航与空天目标工程学院, 郑州 |
| 吴建军 |
国防科学技术大学 航天科学与工程学院, 长沙 |
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| Abstract: |
| The phenomena of droplet collision not only exist widely in the downstream region of ejection nozzles in the combustion chambers of power equipments,but also they will affect the atomization characteristics of fuel.In order to reveal the binary collision mechanism of droplets with equal diameters,the Navier-Stokes equations are firstly solved in the axisymmetric coordinates and the method of VOF (Volume of Fluid) is utilized to track the evolution disciplines of the gas-liquid free surface during the process of droplet collision.Then,veracity of the numerical models is validated with the experimental results of Qian.Effects of ambient pressure on different results (separation and coalescence) after droplet bouncing are investigated,and effects of ambient pressure and Weber number on separation of two droplets after collision are also analyzed.Results show that states (separation and coalescence) of droplets after collision and rebound are determined by the pressure of gaseous film between droplets and gaseous dynamic resistance together.Moreover,the separation process of two droplets after collision is independent of the ambient pressure,and the higher Weber number of droplets leads to more serious deformation. |
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