Pressure effects on laminar burning velocities and Markstein lengths for Isooctane–Ethanol–Air mixtures

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

“…It is noted that Jayachandran et al [10] showed that the error associated with radiation-induced flow effect can be avoided through direct flow and flame front speed measurements with highspeed PIV [25,77,78]. Nevertheless, in such measurements the effect of heat loss through particle radiation and conduction and the uncertainty in flow speed measurement may also affect the accuracy of laminar flame speed measured from the OPF method.…”

Experimental assessment of various methods of determination of laminar flame speed in experiments with expanding spherical flames with positive Markstein lengths

“…It is worth noting that perturbations (ii), (iii), and (iv) impede determining not only S b , but also S u for a given S b . These difficulties can be overcome by directly measuring S u and such techniques were recently developed [33][34][35]. In the cited papers, not only flame radius, but also the velocity field in the unburned gas were measured, followed by evaluation of S u as follows S u u ¼ dR f =dt À u m , where u m is the maximum (in space) flow velocity in the direction normal to the flame front.…”

“…These observations are beneficial for the LC Eq. (6) when compared to alternative expressions, especially as the sub-range B 2 is sufficiently wide (flame radii are varied from 9 to 16 mm) and is characterized by sufficiently large R f (the ignition perturbations were claimed to be weak when flame radii were larger than 6.5 mm [34,35,71,72], 7 mm [50,61], or 8 mm [59]). If each run is processed independently, then, the LC Eq.…”

Laminar flame speed of lignocellulosic biomass-derived oxygenates and blends of gasoline/oxygenates

“…It is also useful to validate new developed chemical kinetic mechanisms as well as turbulent combustion models [8][9][10][11]. Numerous previous studies have delivered significant insights into the effects of the addition of oxygenates on the laminar flame speeds of gasoline or diesel fuels [10,[12][13][14][15][16][17][18][19].…”

“…In their work, adiabatic laminar burning velocity measurement was firstly conducted for a gasoline model fuel consists of n-heptane, iso-octane and toluene mixtures at condition of P = 0.1 MPa and T = 358 K. Measurements were then performed for blends mixed by this model gasoline fuel and ethanol to address the influence of ethanol as an oxygenated additive on laminar flame speed of gasoline at atmospheric pressure condition. In Varea et al's [10] work, measurement conditions of laminar flame speed were extended to high pressure P = 1 MPa for the blends of iso-octane and ethanol using a spherical flame configuration. Most of the previously studied oxygenated fuels added to surrogate gasoline are referred to oxygenate produced from bio-chemical production route i.e.…”