Numerical study of high speed water droplet impact walls by two-fluid model

• Main Authors: Hong-Wei Wang, 王泓為
• Other Authors: Yang-Yao Niu
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/p3p4c4

碩士 === 淡江大學 === 航空太空工程學系碩士班 === 103 === The liquid droplet dynamics are widely seen in the industry application such as inkjet printing, injection in the combustion chamber, high-pressure spray cleaning, droplet-wall interactions in diesel engines, and impact of cloud droplets on airplane wings in which impact of small droplets on a solid surface is a key phenomenon. In this research, the previous numerical codes developed Niu .et al (2008) is combined with the exact Riemann solver scheme as numerical flux splitting to solve the compressible two-fluid six-equation model. We focus on the simulation of high speed micro-droplet impact on a rigid surface by different impact speed and incidence angle. We set 100-500m/s of impact velocity and 30-90 degree of incidence angle to study the related pressure distributions on walls, propagation of shock front and expansion wave inside the droplet and high speed jetting near the surface. The capturing of phenomenon is accurate and robust. Numerical results show that under the same impact condition the maximum pressure simulated by in the 2D case is shown to be bigger than the 3D case; the jet time in the 3D case is relatively delayed. The impact energy increased with high velocity and incidence angle. Numerical validation shows our results is closer to 1D theoretical model.