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research-article

A Numerical Investigation on NO2 Formation in a Natural Gas-Diesel Dual Fuel Engine

[+] Author and Article Information
Yu Li

West Virginia University, Morgantown, WV, 26506
liyu.academic@gmail.com

Hailin Li

West Virginia University, Morgantown, WV, 26506
hailin.li@mail.wvu.edu

Hongsheng Guo

National Research Council, Ottawa, ON, Canada
hongsheng.guo@nrc-cnrc.gc.ca

Yongzhi Li

Tianjin University, Tianjin, P.R. of China, 300072
liyongzhi@enn.cn

Mingfa Yao

Tianjin University, Tianjin, P.R. of China, 300072
y_mingfa@tju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039734 History: Received December 16, 2017; Revised February 19, 2018

Abstract

This research numerically simulates the formation and destruction of NO2 in a natural gas-diesel dual fuel engine using commercial CFD software CONVERGE coupled with a reduced primary reference fuel (PRF) mechanism consisting of 45 species and 142 reactions. The model was validated by comparing the simulated cylinder pressure, heat release rate, and nitrogen oxides (NOx) emissions with experimental data. The validated model was used to simulate the formation and destruction of NO2 in a NG-diesel dual fuel engine. The formation of NO2 and its correlation with the local concentration of nitric oxide (NO), methane, and temperature were examined and discussed. It was revealed that NO2 was mainly formed in the interface region between the hot NO-containing combustion products and the relatively cool unburnt methane-air mixture. NO2 formed at the early combustion stage is usually destructed to NO after the complete oxidation of methane and n-heptane, while NO2 formed during the post-combustion process survives through the expansion process and exits the engine. A detailed analysis of the chemical reactions occurring in the NO2 containing zone identified HO2 as the primary species dominating the formation of NO2. The simulation revealed the key reaction path for the formation of HO2 noted as CH4->CH3->CH2O->HCO->HO2, with conversion ratios of 98%, 74%, 90%, 98%, accordingly. The backward reaction of OH+NO2=NO+HO2 consumed 34% of HO2 for the production of NO2.

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