Wide Temperature Range Kinetics of Plume Reactions
Final rept. Mar 95-Mar 98
RENSSELAER POLYTECHNIC INST TROY NY DEPT OF CHEMICAL ENGINEERING
Pagination or Media Count:
The kinetics of reactions leading to the CO Fourth Positive vacuum ultraviolet emission is studied for incorporation in plume radiation models. A fast-flow reactor and a high-temperature pseudo-static, photochemistry reactor have been used. Experiments with the former on the O C2H2 reaction have shown that the intensity of the CO Triplet bands decreases with increasing pressure. This is in accord with the proposed mechanism for CO formation, by collision-induced curve crossing from CO triplet states. Experiments in the pseudo-static reactor have confirmed the increase of the CO chemiluminescence intensity with pressure, as indicated by this mechanism, but show a decrease in the intensity of the emission when the C2 O2 reaction is investigated instead. This indicates a direct CO formation in the latter reaction, which leads to more intense vuv emission and may be a more important reaction for rocket exhausts. As the first step toward obtaining the absolute light intensities and chemiluminescence efficiencies for the C2 02 reaction, its vuv emission is used to obtain its overall rate coefficients, k300-976 K 1.8X10 TO THE MINUS 11TH POWER exp-451 KT cu cmmolecule.sec. These values are in excellent agreement with earlier experiments, where the C2 consumption rate coefficients were measured instead.
- Physical Chemistry
- Combustion and Ignition