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By Kasatkin A.G.

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Schematic Diagram Showing the Definition of the Preheat Zone Thickness, n 22 through an inflection point at some intermediate temperature between the unburned and burned temperature, and if a tangent to the temperature dis­ tance curve at this inflection point is extended back to 6 , the initial o temperature, the distance between the inflection point and the intersection with 0 q is called the preheat zone thickness, n . essentially contains no chemistry. In this region, the flame The gases are simply being heated by thermal conduction from the hot reaction zone in the higher temperature re­ gions of the flame.

If organic compounds with widely dissimilar structures are mixed, the rule does not work quite as well. Unfortunately, there is no good theory for predicting flamma­ bility limits. Even more unfortunately when one attempts to measure flam­ mability limits using different types of apparatus, one finds that the measured limits can vary quite markedly from apparatus to apparatus. The practical problem of determining flammability limits will be discussed in more detail in a later section. When one is dealing with liquid fuels, one must also define a flash point for that fuel.

Under these circum­ In general, both the flame temper­ ature and the burning velocity increase as one approaches a stoichiometric mixture. Specifically, most flames show a maximum temperature and burning velocity at an equivalence ratio of about 1:1. r peratures and burning velocities ( ^ ) u m »a fx° common fuels in air are shown in Table 1-1. Typical maximum flame tem­ mixtures of some of the more Other flame properties tabu­ lated in Table 1-1 will be discussed in later sections of this chapter.

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