Computational Analysis of the Extended Zeldovich Mechanism

A computational study was used to investigate the effects of temperature and pressure on the extended Zeldovich mechanism. Two temperatures, namely 2,600 and 1,900 K, were used while keeping the species concentration of all component products constant at 1.0 mole/m(3). These temperatures were selected because they represent typical operating conditions for internal combustion engines. Pressure was varied by decreasing the species concentration for all component species by 10 % while keeping the temperatures constant. The pressures were . The estimate of the uncertainties in the global errors of [NO], [N], and [O] for the conditions investigated was found to vary between (, respectively. The numerical results show that high temperatures result in faster rate of production of both [NO] and [O] and faster rate of [N] depletion. At moderately low temperatures (1,900 K), the rate of depletion of both oxygen and nitrogen atoms is very high. It was observed that changes in pressure had a minor or at best marginal influence on the production of [NO], [N], and [O]. The work also shows that for all the equilibrium points investigated, only one in each case was physical and the others were non-physically realizable because at least one of their equilibrium points was negative.