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Combustion under one-dimensional stratified fuel concentration in a constant-volume vessel
Published July 13, 1999 by Society of Automotive Engineers of Japan in Japan
A long and cylindrical constant-volume vessel was prepared to investigate the effect of the gradient of the concentration field on the combustion. Propane was injected in the air in the vessel from under part of the vessel. Judging from the result obtained from the laser-induced fluorescence method, the fuel of propane diffuses to upper side of the vessel with increasing time and it is confirmed that the successive and gradient concentration field is formed. The mixture was ignited near the bottom side of the combustion chamber by a spark plug. As a result, the combustion can occur even below the lean limit of mixture ratio in total when the concentration at the spark plug is within the limits of flame development. However, the maximum value of the pressure in the vessel is lower than that of homogeneous mixture due to bulk quenching.