Multidimensional CFD simulation of diesel spray combustion using chemical kinetics

Nobuyuki Kawahara, Norihiro Takeda, Eiji Tomita

Research output: Contribution to conferencePaper

Abstract

The purpose of this study is to simulate the process from spray injection to spray combustion in a rapid compression machine (RCM) more precisely. Spray behavior and spray combustion were simulated by Generalized Tank and Tube (GTT) code which is based on KIVA code. First, the model coefficients of modified wave break-up model for liquid droplet break-up were considered using experimental results of droplet diameter and velocity obtained using a laser 2-focus velocimeter (L2F). Calculation results of spray tip penetration under atmospheric conditions were good agreement with experimental from the visualization of isothermal spray under higher injection pressure conditions. Second, multidimensional CFD simulations of diesel spray combustion using the reduced chemical kinetics were carried out under RCM experimental conditions with 900 K of ambient temperature and 4.1 MPa of ambient pressure. The modelled results were validated by comparing predictions against corresponding experimental results in RCM. The predicted and measured in-cylinder pressure were in good agreement. Ignition process of diesel spray combustion of free spray in RCM were discussed with spray break-up phenomena, entrainment structure of higher injection pressure, and OH radical formation of diesel spray combustion.

Original languageEnglish
Publication statusPublished - Jan 1 2017
Event9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017 - Okayama, Japan
Duration: Jul 25 2017Jul 28 2017

Other

Other9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017
CountryJapan
CityOkayama
Period7/25/177/28/17

Keywords

  • Diesel combustion
  • Simulation
  • Spray break-up model
  • Spray combustion

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

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  • Cite this

    Kawahara, N., Takeda, N., & Tomita, E. (2017). Multidimensional CFD simulation of diesel spray combustion using chemical kinetics. Paper presented at 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017, Okayama, Japan.