Actual indicator diagram is shown in Figure 5.5.
In this diagram, points 1, 2, 3, 4 and 5 show actual admission pressure, point of cut-off, point of release, point of closing the exhaust port and starting of compression, and point of opening of admission port, respectively.
The area of actual indicator diagram is less than the theoretical indicator diagram.
Figure 5.5 Actual Indicator Diagram for Steam Engine
Indicated power of single acting reciprocating steam engine
Indicated power of double acting reciprocating steam engine
where pm is a mean effective pressure, L is a length of stroke, A is a piston c/s area, and N is r.p.m.
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