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Title: Experimental study on stoichiometric laminar flame velocities and Markstein lengths of methane and PRF95 dual fuels
Authors: Petrakides, Sotiris
Chen, Rui
Gao, Dongzhi
Wei, Haiqiao
Keywords: Natural gas
Methane-gasoline dual fuel
Combustion characteristics
Laminar flame speed
Markstein length
Issue Date: 2016
Publisher: © Elsevier
Citation: PETRAKIDES, S. ...et al., 2016. Experimental study on stoichiometric laminar flame velocities and Markstein lengths of methane and PRF95 dual fuels. Fuel, 182, pp. 721-731.
Abstract: Natural gas is one of the most promising alternative fuels. The main constituent of natural gas is methane. The slow burning velocity of methane poses significant challenges for its utilization in future energy efficient combustion applications. Methane-gasoline dual fuelling has the potential to improve methane’s combustion. The fundamental combustion characteristics of a methane-gasoline Dual Fuel (DF) blend needs further investigation. In the current experimental study, the relationship between laminar flame velocity and Markstein length, with the ratio of gas to liquid in a DF blend has been investigated using spherical flames in a constant volume combustion vessel. A binary blend of primary reference fuels (PRF95) was used as the liquid fuel. Methane was added to PRF95 in three different energy ratios 25%, 50% and 75%. Values of the stoichiometric laminar flame velocities and Markstein lengths are measured at pressures of 2.5, 5, 10 Bar and a temperature of 373 K. It has been found that with a 25% increase in the DF ratio, the Markstein length is reduced by 15%, 21%, 32% at a pressure of 2.5, 5 and 10 Bar respectively whereas at the same pressures the laminar flame velocity is reduced by 2%, 3% and 5%. The flame evolution at the early stages of combustion is found to be faster with an increase in the DF ratio, and gradually as the flame develops it becomes slower.
Description: This paper was accepted for publication in the journal Fuel and the definitive published version is available at http://dx.doi.org/10.1016/j.fuel.2016.06.047
Version: Accepted for publication
DOI: 10.1016/j.fuel.2016.06.047
URI: https://dspace.lboro.ac.uk/2134/21831
Publisher Link: http://dx.doi.org/10.1016/j.fuel.2016.06.047
ISSN: 0016-2361
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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