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POWER CARD
Types of Indicator Diagrams:
Four types of indicator diagrams or cards can be
obtained from a slow-running diesel enginePOWER CARD
This is taken with the indicator drum in phase with piston
movement. The area within this diagram represents the work done during the
cycle to scale. This may be used to calculate the power produced after
obtaining the indicated mean effective pressure of the unit.
COMPRESSION DIAGRAM
This is taken in a similar manner to the power
card but with the fuel shut off from the cylinder. The height of this diagram
shows maximum compression pressure. If compression and expansion line coincide,
it shows that the indicator is correctly synchronized with the engine
DRAW CARD or OUT-OF-PHASE DIAGRAM
LIGHT SPRING DIAGRAM
Taken in a similar manner to the power card with
fuel pump engaged but with the indicator drum 90* out of phase with piston
stroke. This illustrates more clearly the pressure changes during fuel
combustion
3 comments:
Dear sir, as you have explained compression diagram, you didn't elaborate why there are two curves on that diagram. It would be helpful if you would have explained a little bit in detail.
Also light spring diagram is taken in phase and not out of phase. P.S, thank you
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