剪切稀化非牛顿射流撞击液膜破碎直接数值模拟

doi:10.7527/S1000-6893.2018.21982

Abstract

Abstract: Impinging liquid jets have been widely used in liquid rocket propulsion systems as a fuel atomization method. The breakup mechanism of impinging liquid jets directly affects the mixing and combustion efficiency of the fuel. In the present work, a Direct Numerical Simulation (DNS) tool is applied to study the sheet breakup formed by two impinging jets with non-Newtonian shear thinning properties under low Reynolds number (Re_l=41) and moderate Weber number (We_l=163), including in particular the three-dimensional structure, breakup mechanism, and non-Newtonian feature of the diagonal liquid sheet. The results indicate that the breakup regime of the impinging sheet under current conditions belongs to the Open Rim type. Collison of ligament with rim as well as transition from ligament to droplet can be observed during the sheet breakup. The total liquid surface area increases with time, whereas the specific surface area decreases with the occurrence of sheet breakup. The half-expansion angle of the liquid sheet increases with time and eventually tends to be a constant 43°, but the length of the back sheet shows no tendency of change with time. Additionally, a strong shear thinning feature can be found within the liquid sheet, with the lowest viscosity of the liquid sheet being only 1/5 of that at zero shear rate.

Key words: impinging jets, non-Newtonian fluid, sheet breakup, Direct Numerical Simulation (DNS), shear thinning

CLC Number:

V231.2

ZHU Chengxiang, WU Meng, CHEN Rongqian, YOU Yancheng. Direct numerical simulation of sheet breakup formed by two impinging jets with non-Newtonian shear thinning properties[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(5): 121982-121982.

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Direct numerical simulation of sheet breakup formed by two impinging jets with non-Newtonian shear thinning properties

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