title: Effects of CO2/N2dilution on laminar burning velocity of stoichiometric DME-air mixture at elevated temperatures.
abstract: The laminar burning velocity of CO2/N2diluted stoichiometric dimethyl ether (DME) air mixtures is determined experimentally at atmospheric pressure and elevated mixture temperatures using a mesoscale high aspect-ratio diverging channel with inlet dimensions of 25mm×2mm. In this method, planar flames at different initial temperatures (Tu) were stabilized inside the channel using an external electric heater. The magnitude of burning velocities was acquired by measuring the flame position and initial temperature. The mass conservation of the mixture entering the inlet and the stationary planar flame front is applied to obtain the laminar burning velocity. Laminar burning velocity at different initial mixture temperatures is plotted with temperature ratio (Tu/Tu,o), where a reference temperature (Tu,o) of 300K is used. Enhancement in the laminar burning velocity is observed with mixture temperature for DME-air mixtures with CO2and N2dilutions. A significant decrease in the burning velocity and slight increase in temperature exponent of the stoichiometric DME-air mixture was observed with dilution at same temperatures. The addition of CO2has profound influence when compared to N2addition on both burning velocity and temperature exponent.
authors.affiliation: Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Abdul Naseer
authors.initials: AN
authors.lastname: Mohammed
authors.affiliation: Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Khalid A
authors.initials: KA
authors.lastname: Juhany
authors.affiliation: Department of Aerospace Engineering, Indian Institute of Technology Bombay, Powai, Mumbai, India.
authors.forename: Sudarshan
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University, India.
authors.forename: V Ratna
authors.initials: VR
authors.lastname: Kishore
authors.affiliation: Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia. Electronic address: akramnmania@gmail.com.
authors.forename: Akram
authors.initials: A
authors.lastname: Mohammad
keywords: DME; Dilution effect; Dimethyl ether; Laminar burning velocity; Temperature effects etc