ratio of expansion

ratio of expansion

[′rā·shō əv ik′span·shən]
(mechanical engineering)
The ratio of the volume of steam in the cylinder of an engine when the piston is at the end of a stroke to that when the piston is in the cutoff position.
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References in periodicals archive ?
d]), shown in the following equation, is relevant to the volume of the cylinder at the closed angle of suction and the ratio of expansion ([epsilon]):
According to Equations 6 and 7, the closed angle of suction and the discharge angle can be determined when the designed mass flow rate and ratio of expansion are known.