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QUASI-D DIESEL ENGINE COMBUSTION MODELING WITH IMPROVED DIESEL SPRAY TIP PENETRATION, IGNITION DELAY AND HEAT RELEASE SUB-MODELS

[+] Author and Article Information
Shuonan Xu

Clemson University, Automotive Engineering Department Greenville, SC, USA
shuonax@clemson.edu

Hirotaka Yamakawa

Hiroshima University, Mechanical Engineering Department Hiroshima, Japan
m156647@hiroshima-u.ac.jp

Keiya Nishida

Hiroshima University, Mechanical Engineering Department Hiroshima, Japan
kn1102@aol.com

Zoran Filipi

Clemson University, Automotive Engineering Department Greenville, SC, USA
zfilipi@clemson.edu

1Corresponding author.

ASME doi:10.1115/1.4036575 History: Received February 15, 2017; Revised March 15, 2017

Abstract

Diesel engines dominate the heavy duty market and significant segments of the global light duty market due to their intrinsically high thermal efficiency. Predictive simulation tools significantly reduce the time and cost associated with optimization of engine controls, and enable investigation over a broad operating space. Quasi-D models offer a balance between predictiveness and computational effort, thus making them very suitable for enhancing the fidelity of engine system simulation tools. A most widely used approach for diesel engine applications is a multi-zone spray and combustion model pioneered by Hiroyasu and his group. It divides diesel spray into packets and tracks fuel evaporation, air entrainment, gas properties and ignition delay (induction time) individually during the injection and combustion event. However, original sub-models are not well suited for modern diesel engines, and the main objective of this work is to develop a multi-zonal simulation capable of capturing the impact of high-injection pressures and Exhaust Gas Recirculation (EGR). In particular, a new spray tip penetration sub-model is developed based on measurements obtained in a high-pressure, high-temperature constant volume combustion vessel. Next, ignition delay correlation is modified to capture the effect of reduced oxygen concentration in engines with EGR, and an algorithm considering the chemical reaction rate of hydrocarbon-oxygen mixture improves prediction of the heat release rates. Spray and combustion predictions were validated with experiments on a single-cylinder diesel engine with common rail fuel injection, charge boosting, and EGR.

Copyright (c) 2017 by ASME
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