How does "air to fuel ratio" influence the "quality " of a combustion process?
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Answer: As the fuel to air ratio is increased or decreased sufficiently, departing from the stoichiometric value, two finite limits are eventually reached beyond which the mixture is no longer able to propagate a flame. These limits bracket the flammable (or explosive) range of a given combustible gas or vapor in air. Figure 2-5 illustrates the flammability ranges in air for some gases. Because acetylene, being a very reactive compound, is able to decompose exothermically in the absence of oxygen, its upper explosion limit is in fact 100 percent. The first two columns of Table 2-2 give numerical values for the lower and upper flammability limits of a number of combustible gases and vapors in air,
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