A simulation method and the effect of turbulence perturbation on droplet breakup

被引：0
|
作者：
Qi W. [1 ]
Ming P. [1 ]
Zhang W. [1 ]
Peng Y. [1 ]
机构：
[1] College of Power and Energy Engineering, Harbin Engineering University, Harbin
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2018年 / 39卷 / 04期
关键词：
Atomization; Droplet breakup model; Nozzle; Primary breakup; Secondary breakup; Spray penetration; Turbulence perturbation;
D O I：
10.11990/jheu.201611044
中图分类号：
学科分类号：
摘要：
In this paper, the effect of turbulence perturbation inside a jet during atomization was investigated. The turbulence inside the nozzle was characterized by the turbulence characteristics of length and time scale, and this was then added into a primary breakup model in the form of a weighted coefficient. First, the effects of an unstable wave and turbulence perturbation on single droplet breakup were analyzed. The results show that the effect of turbulence on droplet breakup gradually reduced with increasing time, while the influence of the unstable wave increased step by step. In addition, a larger jet rate resulted in larger turbulence perturbation energy and a longer influencing time. The model was then validated using experimental data. The predictions showed that the turbulence term can decrease the Sauter mean diameter (SMD) by about 4%, and with increasing injection pressure the effect of turbulence perturbation on breakup length increases. Although secondary breakup occurred far from the nozzle, the initial value of the turbulence term still determined the size and velocity of the secondary droplet. © 2018, Editorial Department of Journal of HEU. All right reserved.
引用
收藏
页码：709 / 715
页数：6
相关论文
共 17 条
  • [1] Shi C., Ren L., Yu S., Et al., Application of spray breakup model in the CFD of IC engine, Tractor & Farm Transporter, 33, 3, (2006)
  • [2] O'Rourke P.J., Amsden A.A., The TAB method for numerical calculation of spray droplet breakup, (1987)
  • [3] Reitz R.D., Diwakar R., Structure of high-pressure fuel sprays, (1987)
  • [4] Patterson M.A., Reitz R.D., Modeling the effects of fuel spray characteristics on diesel engine combustion and emission, (1998)
  • [5] Huh K.Y., Lee E., Koo J., Diesel spray atomization model considering nozzle exit turbulence conditions, Atomization and Sprays, 8, 4, pp. 453-469, (1998)
  • [6] Som S., Development and validation of spray models for investigating diesel engine combustion and emissions, (2009)
  • [7] Ishimoto J., Hoshina H., Tsuchiyama T., Et al., Integrated simulation of the atomization process of a liquid jet through a cylindrical nozzle, Interdisciplinary Information Sciences, 13, 1, pp. 7-16, (2007)
  • [8] Lei G., The application and research of the unstructured grid FVM in the turbulent reaction flows simulation with complex geometries, (2008)
  • [9] Ming P., Development of numerical modeling for gas-liquid two-phase flows based on unstructured grids and parallel computing, (2008)
  • [10] Liu Y., Ming P., Zhang W., Et al., An efficient Lagrange point tracking algorithm for fixed grids, Chinese Journal of Computational Physics, 27, 4, pp. 527-532, (2010)
12