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 ?
The best flow field of a free jet should feature high velocity and an unobvious shield effect, entirely depending on the ratio of expansion ratio and inlet pressure.
The exception being that the ratio of expansion stroke to in-cylinder effective compression stroke is higher than the baseline.
The volume of the cylinder at the exhaust angle ([[theta].sub.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]):

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