![](bg1.png)
Effect of High Cetane Fuel Blended with Methanol on
Combustion Characteristics
L Mei
1, *
, R N Li
1
, S Liu
1
and P H Chen
2
1
School of Automotive and Traffic Engineering, Jiangsu University, Jiangsu 212013,
China
2
Nantong Shipping College, Jiangsu 226010, China
Corresponding author and e-mail: L Mei, zjml94@163.com
Abstract. The influence of high cetane number fuel blended with methanol on the
combustion characteristics of diesel engine is studied. Fuels of high cetane number with
different cetane number were compounded by FT diesel fuel and methanol. Bench tests were
performed on 186F diesel engine. The cylinder pressure and heat release rate of different high
cetane number fuels were measured. The change law of ignition delay period and the
combustion duration of different methanol blending ratio under and loads were analyzed. The
results show that under the rated condition, with the decrease of the mixed fuel cetane number,
the maximum combustion pressure and peak value of heat release rate increase, and the
corresponding crank angle is delayed. When the cetane number of the fuel reduces from 75 to
64 under constant load, the ignition delay period increases and the combustion duration
reduces. The changes of the ignition delay period and combustion duration vary most
obviously under 25% load, ranging from 2.8°CA to 6.1°CA, respectively. With the same
high cetane number fuel, as the load increases, the ignition delay period shortens and the
combustion duration increases.
1. Introduction
In our country, due to the energy structure feature of rich coal and poor oil, the development of coal-
based synthetic oil fuels to replace some petroleum-based fuels has great advantages [1]. F-T diesel
oil is a product of indirect coal liquefaction with high cetane number. Methanol has high oxygen
content and high latent heat of vaporization, which can be mass-produced by coal, and is a kind of
clean fuel with low price and huge output[2].
The combustion and emissions of diesel are closely related to the physicochemical properties of
the fuel. The cetane number of diesel ranges from 45 to 50 normally [3]. Fuel with cetane number
higher than 50 is called high cetane number fuel. Cetane number of FT diesel and methanol is 75 and
3, respectively. A small amount of methanol is blended with the FT diesel fuel to obtain the mixed
fuel, the cetane number of which still belongs to the high cetane number range. The FT diesel fuel is
mixed with methanol to study the effect of high cetane number fuel blended with methanol on the
combustion process.
Domestic and foreign scholars have done a lot of research work on the effect of fuel blended with
methanol on the combustion process. Han et al.[4] studied the effects of fuel properties such as
Mei, L., Li, R., Liu, S. and Chen, P.
Effect of High Cetane Fuel Blended with Methanol on Combustion Characteristics.
In Proceedings of the International Workshop on Environmental Management, Science and Engineering (IWEMSE 2018), pages 313-318
ISBN: 978-989-758-344-5
Copyright © 2018 by SCITEPRESS – Science and Technology Publications, Lda. All rights reserved
313