Ignition and chemical kinetics of acrolein–oxygen–argon mixtures behind reflected shock waves

Abstract

In order to address increasing greenhouse gas emissions, the future fossil fuel shortage and increasingly stringent pollutant emission regulations, a variety of biofuels are being progressively incorporated into conventional transportation fuels. Despite the beneficial impact of biofuels on most regulated pollutants, their combustion induces the increase of a variety of aldehydes that are being considered for specific regulations due to their high toxicity. One of the most hazardous aldehyde compounds is acrolein, C 2 H 3 CHO. Despite its high toxicity and increased formation during bioalcohol and biodiesel combustion, no experimental data are available for acrolein combustion. In the present study, we have investigated the ignition of acrolein-oxygen-argon mixtures behind reflected shock wave using three simultaneous emission diagnostics monitoring OH*, CH* and CO 2 *. Experiments were performed over a range of conditions: Φ=0.5-2; T 5 =1178-1602 K; and P 5 =173-416 kPa. A tentative detailed reaction model, which includes sub-mechanisms for the three measured excited species, was developed to describe the high-temperature chemical kinetics of acrolein oxidation. Reasonable agreement was found between the model prediction and experimental data.

Ignition characteristics of dual-fuel methane-n-hexane-oxygen-diluent mixtures in a rapid compression machine and a shock tube

“…Regarding the effect of equivalence ratio, the effect of n-hexane addition in shortening the ignition delay time weakens for stoichiometric and rich mixtures, see Figure 9 and 10. This can be attributed to the self-inhibition property of hydrocarbons on the ignition process in the high-temperature range [40,31]. All three chemical kinetic mechanisms capture the main experimental features but significant deviations can be observed with relative error as high as 200% under certain conditions.…”

“…The high-temperature (1250-2335 K) ignition experiments were carried out using the Galcit 6-inch Shock Tube. A detailed description of the ST apparatus and diagnostics was previously given in [40,41,42]. The ignition event was studied behind reflected shock waves using OH*, CH*, and CO 2 * emission.…”

“…The sub-mechanisms of the electronically excited species containing OH*, CH* and CO 2 * [40] were added to each mechanism in order to reproducing ignition delay times measured by emission diagnostics in the ST. A constant volume reactor was used to predict the ignition delay times in shock tube. For the RCM experiments, the ignition delay time is long enough to be affected by heat losses after the end of the compression.…”

Kinetic and Mechanistic Studies for the Gas-phase Reaction of Ozone with 2, 3-Dimethyl-2-Butene and 1, 3-Butadiene

“…The acrolein oxidation in the atmosphere well be mentioned in the literature [18]. While the further atmospheric oxidation of the Criegee intermediate (CH 2 OO) produced in mostly all the steps of the mechanisms suggested in this work is well studied and covered [19][20][21].…”

Ignition of fuel–air mixtures from a hot circular cylinder

“…We determined E / R as a function of temperature by computing constant pressure ( p = 101 . 3 kPa ) adiabatic explosions in Cantera [60] using detailed reaction mechanisms (hydrogen-air: [61][62][63] ; ethylene-air: [64][65][66] ; n-hexane-air: [38,65,67] ) and numerically differentiating ignition delay time in Arrhenius coordinates,…”