Question

The region in which combustion of fuels takes place

Answer 1

Is a very thin layer of bright lights ( the colour is dependant of the chemicals). But in a typical stove flame you have a blue for complete combustion, red for incomplete and a bright center where the bulk of chemical reactions happens. The thickness of layers is a function of pressure and temperature. In the case of a explosion , for example, once the ball of fire takes up speed and becomes a shockwave you no longer can see the combustion layer but it’s there in the form of a incredible thin layer propagating faster than the speed of sound at high pressure and temperature.

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Answer 2

In an internal combustion engine, combustion takes place in cylinder whereas in gas turbines it takes place in Combustion chamber.