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research-article

Effect of Cryogenic Intake Air Temperature on the In-cylinder Temperature and Formation of Exhaust Emissions in a CI Engine

[+] Author and Article Information
Se Hun Min

Graduate School of Mechanical Engineering, Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, Republic of Korea
shmin@smail.kongju.ac.kr

Hyun Kyu Suh

Associate Professor, Ph.D., Division of Mechanical and Automotive Engineering in Kongju National University, 1223-24, Cheonan-daero, Seobuk-gu, Cheonan-si, Chungcheongnam-do, Republic of Korea
hksuh@kongju.ac.kr

Seongin Jo

Department of Mechanical-Automotive Engineering, Graduate School of Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
tjddls93@nate.com

Suhan Park

School of Mechanical Engineering, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
suhanpark@jnu.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4044061 History: Received November 27, 2018; Revised June 13, 2019

Abstract

Abstract The objective of this study is to numerically investigate the effect of cryogenic intake air temperature on the in-cylinder temperature and formation of exhaust emissions in a CI engine. The experimental setup was consisted of a single-cylinder diesel engine. The intake air temperature was varied from 18? to 40? which was controlled by cooler and heater. Sub-models were applied for the simulations of physical/chemical phenomenon of spray and combustion behaviors. The intake air temperature in numerical condition was varied from -18? to 18?. The numerical results were validated with experimental results for the reliability of this work. The results of this work were compared in terms of cylinder pressure, ROHR, ISNO, ISCO, ignition delay, in-cylinder temperature distributions, equivalence ratio distributions, NO mass fraction and CO mass fraction. When the intake air temperature was decreased in steps of 9?, the cylinder temperature and cylinder pressure were decreased in steps of about 14.5? and 0.05MPa, respectively. In all cases, the area where the NO formed in the cylinder was identified with the place of the high equivalence ratio and temperature in the cylinder. The amount of CO generation shows the similar distributions in the cylinder according to the intake air temperature conditions. However, the oxidation rate of formed CO under the low intake air temperature was lower than those of the high intake air temperature.

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