THERMAL SCIENCE

International Scientific Journal

Chutao Lai

,

Xiaokai Zhou

,

Yizhao Hu

,

Yitong Guo

,

Kunyi Li

,

Panjie Wang

EXPERIMENTAL STUDY ON SPRAY IMPINGEMENT DURING DIESEL ENGINE STARTING

ABSTRACT
A lot of research has been carried out in the field of improving combustion efficiency and reducing exhaust gas, but the phenomenon of engine fuel spray hitting the wall cannot be solved well all the time, thus the phenomenon will increase exhaust gas emissions and reduce combustion efficiency. Based on oil pump test bench of Diesel engine, we designed spray-wall impingement’s test, did high speed camera shooting to capture the relevant motion characteristics of fuel spraing-hitting the wall by mosquito-rope method, under the starting process, the influence of different working condition on spray impingement was studied. The results showed that under the condition of high injection rate/low gas pressure, the impact time gets early and the diffusion range gets to be increased. When the injection rate/background gas pressure is constant, the diffusion distance will change dynamically due to the wall roughness, that is to, increase first and then decrease. The increase of the roughness of the contact wall will promote the increase of the height of spray impingement, however, as the temperature of the contact wall rises, the difference in height of spray impingement gets to be decreased due to roughness. When the wall roughness is small, increasing the wall temperature will reduce the horizontal development distance of spray, increases roughness, the difference in height of horizontal development distance gets to be decreased due to wall temperature.
KEYWORDS
Starting process, spray-wall impingement, Working condition, The roughness of the contact wall, The temperature of the contact wall
PAPER SUBMITTED: 2023-05-15
PAPER REVISED: 2023-05-25
PAPER ACCEPTED: 2023-07-11
PUBLISHED ONLINE: 2024-03-10
DOI REFERENCE: https://doi.org/10.2298/TSCI230515043L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 3, PAGES [2385 - 2402]
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Experimental study on spray impingement during diesel engine starting

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence