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research-article

# Numerical investigation of combustion and emission with different diesel surrogate fuel by Hybrid breakup model

[+] Author and Article Information
Wenliang Qi

College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001
muyiren@hrbeu.edu.cn

Pingjian Ming

College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001
pingjianming@hrbeu.edu.cn

Jia Ming

School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024
jiaming@dlut.edu.cn

Ye Peng

College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001
pengye@outlook.com

Chen Liu

College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001
liuchen_hrbeu@hrbeu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041283 History: Received February 16, 2018; Revised August 12, 2018

## Abstract

Injection flow dynamics plays a significant role in fuel spray, this process control the fuel-air mixing, which in turn is critical for the combustion and emissions process in diesel engine. In the current study, an integrated spray, combustion and emission numerical model is developed for diesel engine computations based on the General Transport Equation Analysis (GTEA) code. The model is first applied to predict the effect of turbulence inside the nozzle which is considered by the submodel of hybrid breakup model on diesel spray process. The results indicate that turbulence term enhances the rate of breakup, resulting in more new droplets and smaller droplet sizes, leading to high evaporation rate with more evaporated mass. The model is also applied to simulate combustion and soot formation process of diesel. The effects of ambient density, ambient temperature, oxygen concentration and reaction mechanism on ignition delay, flame lift-off length and soot formation are analyzed and discussed. The results show that although higher ambient density and temperature reduce the ignition delay and causes the flame stabilization location to move upstream, this is not helpful for fuel-air mixing because it increases the soot level in the fuel jet. While higher oxygen concentration has negative effects on soot formation. In addition, the model is employed to simulate the combustion and emission characteristics of a low-temperature combustion (LTC) engine. The overall agreement between the measurements and predictions of in-cylinder pressure, heat release and emission characteristics are satisfactory.

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