Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
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A Proposal for Diesel Spray Model Using a TAB Breakup Model and Discrete Vortex Method

  • Yeom, Jeong-Kuk (Mechanical and Aerospace Engineering Department, Graduate School of Seoul National University) ;
  • Lee, Myung-Jun (Automotive Engineering Department, Yang-san College) ;
  • Chung, Sung-Sik (Mechanical Engineering Department, Dong-A University) ;
  • Ha, Jong-Yul (Mechanical Engineering Department, Dong-A University) ;
  • Jiro Senda (Department of Mechanical Engineering, Doshisha University) ;
  • Hajime Fujimoto (Department of Mechanical Engineering, Doshisha University)
  • Published : 2002.04.01
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Abstract

A hybrid model consisting of a modified TAB (Taylor Analogy Breakup) model and DVM (Discrete Vortex Method) is proposed for numerical analysis of the evaporating spray phenomena in diesel engines. The simulation process of the hybrid model is divided into three steps. First, the droplet breakup of injected fuel is analyzed by using the modified TAB model. Second, spray evaporation is calculated based on the theory of Siebers'liquid length. The liquid length analysis of injected fuel is used to integrate the modified TAB model and DVM. Lastly, both ambient gas flow and inner vortex flow of injected fuel are analyzed by using DVM. An experiment with an evaporative free spray at the early stage of its injection was conducted under in-cylinder like conditions to examine an accuracy of the present hybrid model. The calculated results of the gas jet flow by DVM agree well with the experimental results. The calculated and experimental results all confirm that the ambient gas flow dominates the downstream diesel spray flow.

Keywords

References

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