ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Direct numerical simulation of impinging jet breakup with non-Newtonian properties at low Weber number
Received date: 2016-09-08
Revised date: 2016-11-21
Online published: 2017-03-20
Supported by
National Natural Science Foundation of China (51606161,91441128);the Fundamental Research Funds for the Central Universities (20720170055);Natural Science Foundation of Fujian Province
Impinging jet breakup with non-Newtonian properties has been widely applied in the liquid rocket propulsion system for fuel atomization. However, the basic breakup mechanism of the phenomena still remains unsolved up to now. In the present work, a direct numerical simulation (DNS) based on the volume of fluid method is carried out to investigate the impinging phenomena of two orthogonal identical liquid jets, and to analyze the characteristics and the breakup of the resulted diagonal jet. The results indicate that the diameter of the diagonal jet is 1.66 times larger than that of the original jet. The head breakup can be observed near the jet tip, and the column breakup can be also observed. Due to surface wave development, wavy breakup is generated with the formation of satellite droplets and droplet collision. During the impinging process, the total surface area of the liquid decreases. The local viscosity of the shear thinning liquid decreases as well. Under the condition of low Reynolds and Weber numbers in the present work, the local viscosity varies over 10% spatially.
ZHU Chengxiang , CHEN Rongqian , YOU Yancheng . Direct numerical simulation of impinging jet breakup with non-Newtonian properties at low Weber number[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(8) : 120764 -120764 . DOI: 10.7527/S1000-6893.2017.120764
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