氢气-乙醇-空气预混层流燃烧特性仿真研究.

闫晨朝; 姜根柱; 王筱蓉

The laminar burning velocity, density ratio, adiabatic flame temperature, flame thickness, sensitivity coefficient, and molar fraction of main free radicals of the hydrogen-ethanol-air premixed fuel were analyzed and calculated by using numerical simulation with Chemkin software. The results showed that the laminar burning velocity of the premixed flame was negatively correlated with the initial pressure, and the peak occurred around the equivalence ratio Φ of 1.2 for all initial conditions, and the peak shifted toward the rich combustion side with the increase of hydrogen content. Both the density ratio and adiabatic flame temperature showed a tendency to increase first and then decrease with the increase of the equivalence ratio, while the flame thickness exhibited the opposite trend. The adiabatic flame temperature reached its highest value at Φ = 1.1, which was smaller than the equivalence ratio at which the laminar burning velocity peaked. This discrepancy could be attributed to the presence of substantial heat losses in the experimental setup. In addition, the increase in initial pressure made the flame thickness thinner, causing the flame to exhibit an unstable tendency. The H O2 = O OH was the elementary reaction with the highest sensitivity coefficient at all operating conditions, and the sensitivity coefficient for this radical reaction with respect to the H molar fraction reached its highest value at Φ = 1.2.

HYDROGEN flames; BURNING velocity; ADIABATIC temperature; HEAT losses; MOLE fraction; FREE radicals; FLAME temperature

Advances in New & Renewable Energy, 2023, Vol 11, Issue 5, p450

2095-560X

Academic Journal

10.3969/j.issn.2095-560X.2023.05.009