Gasoline/air mixture

Gasoline-air mixtures tend to ignite prematurely, or knock, rather than bum smoothly. The octane number of a gasoline is a measure of its resistance to knock. It is determined by comparing the knocking characteristics of a gasoline sample with those of isooctane (the common name of one of the isomers of octane) and heptane ... 

Solntsev, V. P. 1961. Influence of turbulence parameters on the combustion process of homogeneous gasoline-air mixture behind a stabilizer under conditions of confined flow. In Flame stabilization and the development of combustion in turbulent How. Ed. G. N. Gorbunov. Moscow Oborongiz. 75. 

In the present work we consider only the combustion and detonation of gaseous explosive mixtures. The practical significance of these problems is related to accident prevention in working with explosive mixtures and to the combustion of gasoline-air mixtures in engines. In the latter case, incidentally, there are a number of peculiarities which we do not consider here. 

From a study of the effect of initial temperature on the rate of rise of pressure Brown, Leslie and Hunn 110 arrived at the same conclusion. Fenning s 117 results showing that the rate of flame propagation is greater with benzene-air than with hexane- or gasoline-air mixtures also supports the proposal tliat tendency to knock cannot he measured by flame speeds. 

Explain why decreased volume for the gasoline-air mixture in the cylinders of a gasoline engine, increased number of gas particles, and increased temperature lead to an increase in pressure in the cylinders. 

Explain why decreased volume for the gasoline-air mixture in the cylinders of Objective 11... 

The combustion of gasoline air mixtures in the combustion chamber of spark ignited engines leads essentially to the fonnation of total oxidation products, but also to CO, H2, NO, a hydrocarbon (HC) mixture and SO2. Several HC emissions formation mechanisms are possible to explain the origin of tlie hydrocarbon mixture [1,2], such as flame quenching at tlie cylinder walls or at crevice entrance, adsorption-desorption in the oil film and incomplete combustion (partial or complete misfire) particularly during transient operations. The HC that are not combusted (about 1 % of the gasoline) are either exliausted unmodified or... 

II) Preferentially two parameters influence the mass concentration and the profiles of PAH in the exhaust (a) ratio of gasoline-air mixture, and (b) percentage of aromatic compounds in the gasoline ... 

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