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The lowest compression ratio which allows compression ignition of a specific fuel.



Related Terms

COMPRESSION RATIO

The ratio of the absolute pressure at the discharge from a compressor divided by the absolute pressure at the suction. For internal combustion engines compression ration is absolute pressure at the end of compression stroke divided by absolute pressure at beginning of this stroke

COMPRESSION IGNITION

Ignition produced by compression of the air in a cylinder of an internal combustion engine before fuel is admitted.

DIESELING

  1. Explosions of mixtures of air and lubricating oil in the compression chambers or in other parts of the air system of a compressor. 2. Continuation of running by a gasoline spark-ignition engine after the ignition is turned off. Also known as run-on.

BULK MODULUS OF ELASTICITY

The ratio of the compressive or tensile force applied to a substance per unit surface area to the change in volume of the substance per unit volume. Also known as bulk modulus; compression modulus; hydrostatic modulus; modulus of compression; modulus of volume elasticity.

PRESSURE RATIO

The ratio of the absolute discharge pressure to the absolute inlet pressure in any compression cycle.

PLATE GIRDER

A riveted or welded steel girder having a deep vertical web plate with a pair of angles along each edge to act as compression and tension flanges.

FIN EFFICIENCY

In extended-surface heatexchange equations, the ratio of the mean temperature difference from surface-to-fluid divided by the temperature difference from fin-to-fluid at the base or root of the fin.

DUTY CYCLE

An expression of the fraction of the total time of pulse radar that radio-frequency energy is radiated. It is the ratio of pulse length to pulse repetition time.

COEFFICIENT OF STRAIN

For a substance undergoing a one-dimensional strain, the ratio of the distance along the strain axis between two points in the body, to the distance between the same points when the body is undeformed.

AFTERCOOLER

A heat exchanger that removes the heat of compression from the air (or other gas) after it leaves the last stage of a compressor.

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