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An indicator diagram is a chart used to measure the thermal, or cylinder, performance of reciprocating steam and internal combustion engines and compressors. [1] An indicator chart records the pressure in the cylinder versus the volume swept by the piston, throughout the two or four strokes of the piston which constitute the engine, or ...
Indicator diagram for steam locomotive [3] Specifically, the diagram records the pressure of steam versus the volume of steam in a cylinder, throughout a piston's cycle of motion in a steam engine. The diagram enables calculation of the work performed and thus can provide a measure of the power produced by the engine. [4]
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Oppose An indicator diagram would very rarely have the mechanism drawn. The piston position doesn't match any of the possible positions indicated by the diagram. Additionally, an indicator diagram is a plot of pressure vs volume (P-V) not pressure vs piston position. This distinction is important for calculating the work done in each cycle.
Diagram showing lap and lead and their relation to valve travel. When on the move, a steam locomotive requires steam to enter the cylinder at precise times relative to the piston's position. [3] This entails controlling the admission and exhaust of steam to and from the cylinders with a valve linked to the motion of the piston. [3]
A compound steam engine unit is a type of steam engine where steam is expanded in two or more stages. [ 1 ] [ 2 ] A typical arrangement for a compound engine is that the steam is first expanded in a high-pressure (HP) cylinder , then having given up heat and losing pressure, it exhausts directly into one or more larger-volume low-pressure (LP ...
A high-pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal for other locomotives. Most locomotives operate with a steam pressure of 200 to 300 psi (1.38 to 2.07 MPa). [1] In the later years of steam, boiler pressures were typically 200 to 250 psi (1.38 to 1.72 MPa).