FLAME PROPAGATION RATES IN THE COMBUSTION OF AMMONIA
CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING
Pagination or Media Count:
An investigation was made of the flame propagation rates and peak pressures of ammonia as compared to iso-octane in spark ignition engine combustion. The influence of compression ratio, speed, manifold pressure, and dissociation of ammonia prior to combustion was studied as a function of equivalence ratio phi. The ammonia kernel development proved to be 1.4 times greater than the 2.72 millisecond average recorded with iso-octane. The maximum ammonia flame rate was 59 fps at phi 0.85 and, for iso-octane, 83 fps at phi 1.23. While the propagation rates of iso-octane fell uniformly on either side of maximum, the ammonia flame rates dropped rapidly on the rich side of maximum through an inflection point. Prior partial dissociation of ammonia, before introduction to the engine, was found to be of prime importance to flame speeds, becoming more critical for leaner mixtures.
- Combustion and Ignition
- Reciprocating and Rotating Engines