where [E.sub.a] is the activation energy, [T.sub.a] is the adiabatic flame
temperature, and R is the universal gas constant.
The corresponding adiabatic flame
temperatures (AFTs) are 1290 K and 1595 K.
temperatures are of comparable magnitude for both stoichiometric hydrogen-air and gasoline (analogously isooctane)-air mixtures; Verhelst and Wallner (2009)  report values of 2390 K for stoichiometric hydrogen-air and 2276 K for stoichiometric isooctane-air (both values at 300 K and 1 atm initially).
The assumption is made that both zone at the same pressure and the ignition temperature is the adiabatic flame
temperature based on the mixture enthalpy at the onset of combustion.
NO and CO concentrations and adiabatic flame
temperature for nine cases are comparatively plotted in Figures 24 which show that there is a reasonable agreement between the generated five-step mechanisms and the detailed GRI 3.0 mechanism.
where [T.sub.0] and [T.sub.f] are the absolute upstream air temperature and adiabatic flame
In this situation, an important decrease of 43% is noticed on the adiabatic flame
temperature (AFT) when oxygen dilution ranges from 21% which refers to fresh-air injection to 9%.
Figure 9 shows time profiles of the measured temperatures of tube flames for an R-32/134a (70/30 wt%)/air mixture in the vicinity of LPL and UPL, i.e., at 17.0 vol% ([phi] = 1.065, adiabatic flame
temperature [T.sub.ad] = 2055K) and 17.5 vol% ([phi] = 1.103, [T.sub.ad] = 2047K) and at 21.5 vol% ([phi] = 1.425, [T.sub.ad] = 1895K) and 22.0 vol% ([phi] = 1.467, [T.sub.ad] = 1870K).
Flame temperature is calculated as equilibrium adiabatic flame
temperature (Olikara, Borman 1975).
are higher flame speed, higher adiabatic flame
temperature, Simulation tools for drastically reduced auto- estimating performance and ignition delay times and the lifetime of materials systems large increase in volumetric will also be enhanced to suit fuel flow rate of hydrogen the new operating compared to natural gas.
He then deals with the energetics of chemical compounds used as propellants and explosives, such as heat of formation, heat of explosion, adiabatic flame
temperature, and specific impulse.
Using the Program STANJAN Equilibrium Solver[c] v4.00, the adiabatic flame
temperature can be accurately predicted.