Multiple Ignition, Normal and Catalytic Combustion and Quenching of Fuel/Air Mixtures.
Interim rept. 1 Jun 77-31 May 78,
PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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Ignition of a quiescent propaneair mixture by a stationary, hot, inert particle has been modeled. The tentative conclusion from the model is that an abraded aluminum particle must have a diameter greater than 800 microns to ignite a stoichiometric propaneair mixture. Experimental data show that a burning aluminum particle must be initially larger than 20-40 microns in diameter to ignite a stoichiometric methaneair mixture. Lean combustion of propane in platinumaluminacordierite catalysts has been studied at atmospheric pressure and gas velocities of 5-30 ms. Measurements of substrate temperature and gas composition, pressure and temperature inside and downstream of the catalyst have been made. The dependences of substrate temperature, gas temperature, and gas composition on inlet temperature, reference velocity, and equivalence ratio have been investigated. Homogeneous reactions in the exhaust are observed only at the higher equivalence rations. Broader interpretation of the variation in exhaust composition with inlet conditions awaits completion of the development of the numerical model. Author