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Numerical Study of Breakup Process of Diesel Spray

디젤분무의 분열과정에 대한 수치해석 연구

  • 염정국 (동아대학교 기계공학과) ;
  • 정우성 (동아대학교 기계공학과)
  • Received : 2013.04.08
  • Accepted : 2013.10.04
  • Published : 2013.12.01

Abstract

High-pressure flows are ubiquitous in many industrial fields. A representative application is fuel injection using a common-rail control system in diesel engines, where the injection pressure in the injector exceeds 1000 bar. In high-speed injection, the fluid injected through the nozzle undergoes breakup owing to the interaction with the ambient gas. The breakup process influences mixture formation, which in turn influences combustion in diesel engines. Therefore, it is very important to analyze the breakup process of fuel spray. The Reitz and Diwakar model and cascade atomization and breakup (CAB) model were used in this study as sub-models for the numerical analysis of the breakup process of fuel spray. This study aims to precisely analyze the breakup process of spray and to investigate the breakup frequency of the injected fuel. Consequently, it proposes a suitable sub-model for analyzing the breakup process of a diesel spray by using CFX, a commercial CFD program.

Keywords

Breakup Model;Common-Rail System;CFD;Internal Combustion Engine;Spray

Acknowledgement

Supported by : 한국연구재단

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