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  Mathematics - Functions 2



In the chapter "Diagrams 3" the difference between a function and measurement results has already been pointed out, both of which lead to a 'function graph', ie a visual representation. In the picture above, let's look at the so-called Seilinger process from a piston engine:

1 -> 2Isentropic compression (without heat supply/dissipation)
2 -> 3Isochoric combustion (without volume change)
3 -> 4Isobaric combustion (without pressure change)
4 -> 5Isentropic decompression (without heat supply/dissipation)
5 -> 1Isochoric load output (without volume change)

These are theoretical curves, all with indicated functional specifications. These allow the engineers, once, e.g. to calculate the expected maximum efficiency.


Why is the chart up so far away from the real process? Because e.g. the complete load change was not taken into account. Also the friction of the bearings and the piston are not taken into account, pump losses are not, too. Also, the heat can not be held in the cylinder chamber either during compression or working cycle.

We will discuss the disadvantage of a theoretical construct with the example of the upper horizontal line from 3 to 4. Here it is assumed that the heat input through the combustion is exactly equal to the loss due to the decreasing pressure during the travel of the piston to BDC. And this also possibly for every operating status, impossible.

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