Simulation of Spray Impingement and Fuel Film Formation in a Direct Injection Diesel Engine

직접분사식 디젤엔진에서의 분무충돌과 연료액막형성 해석

  • 김만식 (서울대학교 대학원 기계공학과) ;
  • 민경덕 (서울대학교 기계항공공학부) ;
  • 강보선 (전남대학교 자동차공학부)
  • Published : 2000.04.20

Abstract

Spray impingement model and fuel film formation model were developed and incorporated into the computational fluid dynamics code, STAR-CD. The spray/wall interaction process were modelled by considering the change of behaviour with surface temperature condition and fuel film formation. We divided behaviour of fuel droplets after impingement into stick, rebound and splash using Weber number and parameter K. Spray impingement model accounts for mass conservation, energy conservation and heat transfer to the impinging droplets. A fuel film formation model was developed by Integrating the continuity, the Navier-Stokes and the energy equations along the direction of fuel film thickness. The validation of the model was conducted using diesel spray experimental data and gasoline spray impingement experiment. In all cases, the prediction compared reasonably well with experimental results. Spray impingement model and fuel film formation model have been applied to a direct injection diesel engine combustion chamber.

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