Structure of a boundary layer with injection and combustion of ethanol

Effect of heat transfer on the distributions of OH and CH radicals in the boundary layer with ethanol combustion

“…The maximum value of T is seen to be located at the center of the heat-release region Q d > 0 surrounded by layers with heat absorption Q d < 0. In the fuel zone, apparently, the region with heat absorption is associated with formation of intermediate reaction products: acetaldehyde and carbon monoxide [14]. In terms of the overall level of heat release (≈600 MW/m 3 ) and the thickness of the heatrelease zone (≈0.8 mm, which is the distance between the points where Q d = 0), the resultant estimates agree with data for methane combustion [9] in counterjets.…”

“…2b, the temperatures at these points are higher than 1200 K, and chemical interaction is possible if reagents are present. As was noted in [14], however, there is no fuel on the heat-release boundaries with y/y f > 1, whereas there is no oxidizer in the region with y/y f < 1. Therefore, there is no chemical reaction on the boundaries of the heat-release region.…”

“…3b) for the corresponding levels of turbulence. The horizontal arrows show the coordinates of the flame "front" based on the data of [11,14,15]: (1), temperature (2), and CH radical (3) according to [11]; the data for the CH radical are plotted in relative units; curve 4 shows the polynomial approximation. the shift of the maximums of the OH concentration and temperature reaches 2-3 mm.…”

“…The study involves experimental data on the distributions of the OH and CH radicals and stable substances and on the mean velocities and temperatures obtained in [11,14,15].…”

Distribution of OH and CH Radicals in the Boundary Layer with Ethanol Combustion

“…The difference in the profiles of the CH and OH concentrations is also noted in the flame of the glassblower torch [10], in experiments with diffusion burning of methane [11], and in experiments with combustion of a partly mixed methane-air mixture [12]. Figure 1b shows the distributions of the volume concentrations of stable substances r i in combustion of ethanol, obtained by means of gas chromatography [13]. Possibly, the specific distribution of the CH concentration (see Fig.…”