Normal burning velocity and propagation speed of ethane–air: Pressure and temperature dependence

Experimental Study and Kinetic Modeling of Laminar Flame Propagation in Premixed Stoichiometric n-butane-air Mixture

“…In the examined temperature range the baric coefficients of experimental laminar burning velocities seem to be constant, with deviations within 6-12%. They are close to the baric coefficients of laminar burning velocities found for other stoichiometric alkane-air flames: ν= -0.17 for ethane-air [9] and propane-air mixture [35] at ambient initial temperature. In measurements between 1 and 5 bar on stoichiometric n-butane-air mixture at 298 K, Nair and Gupta found ν = -0.11 [18].…”

“…The signals from the ionization probe and from the Charge Amplifier were recorded with an acquisition data system TestLab TM Tektronix 2505, by means of an acquisition card type AA1, usually at 7000 signals/s. Other details regarding the experimental set-up and the operating mode were previously given [7,9,[25][26][27].…”

“…Both laminar burning velocity and the propagation speed can be determined by experimental techniques using stationary flames (flames anchored on a burner; stagnation flow flames) or nonstationary flames (flames propagating in a tube; outwardly propagating flames) [2,5,6]. Experiments based on flames propagating in closed vessels with central ignition are most adequate for measurements of burning velocity and propagation speed in wide ranges of pressure and temperature, far from ambient [7][8][9]. n-Butane was chosen as test fuel in the present study, since it is commonly used as fuel in automotive engines and domestic heaters, either alone or in a mixture with propane (as Liquefied Petroleum Gas, known as LPG).…”

The development of a new optical method to measure the delay time of spark ignition

“…It relies on the detailed analysis of the early stages of flame propagation. The use of the third power law of pressure increase during these stages, ∆P, combined with an improved statistical analysis of experimental data, resulted in a new method to evaluate the normal burning velocity and suggested the existence of an ignition delay time, τ, defined as a time interval between the ignition energy deposition and the beginning of steady flame propagation [21][22][23][24][25][26][27]:…”

“…The method was validated either by comparing the resulted parameters with those reported in literature [21][22][23][24][25][26][27][28], or by analysing also the time evolution of emitted radiation within the same time interval [29].…”