By using the counterflow flame technique, laminar flame speeds of H2/O2/N2 mixtures have been experimentally determined in the fuel stoichiometric range of ultra-lean to moderately-rich, oxygen concentration range of 7.4 to 30 molar percent of the oxidizer, and pressure range of 0.2 to 2.25 atm. These results are then compared with the numerically-determined values obtained by using several existing H2/O2 kinetic schemes. Results show that, while these kinetic schemes accurately predict the propagation speeds of high-temperature flames, they substantially underpredict those of low-temperature flames. Furthermore, while the experimental pressure exponents of the mass burning rates exhibit a minimum-point, parabola-like behavior with increasing pressure, indicating the initial, negative influence of the H-O2 termination reaction and the subsequent availability of a positive channel which facilitates radical production, the calculated results fail to show the increasing trend in the pressure range investigated. It is suggested that existing kinetic schemes may require revision in the intermediate-temperature regime strongly influenced by the HO2 and H2O2 chemistry.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Mechanical Engineering
- Physical and Theoretical Chemistry
- Fluid Flow and Transfer Processes