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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



Related Terms

COMPRESSION PRESSURE

That pressure developed in a reciprocating piston engine at the end of the compression stroke without combustion of fuel.

PRESSURE RATIO

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

CYLINDER HEAD

Plate or cap which encloses compression end of compressor cylinder or combustion chamber of engine.

TURBO CHARGER

The blades of a turbine in the outlet exhaust flow of an engine are driven by the gases flowing over them. Compressor blades at the other end of the same axle are spun in the inlet flow, drawing large volumes of air into the cylinders. This enables faster combustion than naturally aspirated engines and increases power of the engine.

COMPRESSION IGNITION

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

POSITIVE DISPLACEMENT COMPRESSOR

A compressor in which an increase in vapour pressure is attained by changing the internal volume of the compression chamber.

COMPRESSOR ANTI SURGE VALVE

Protects compressor and pipelines from sudden pressure change. Directs gas from the compressor discharge to the compressor suction.

DIESEL CYCLE

An internal combustion engine cycle in which the heat of compression ignites the fuel.

HIGH SIDE

The sections of a refrigeration system which operate at the high discharge pressure of a compressor or pump i.e. Condenser.

VACUUM PUM

Low-pressure air compressor that takes suction from a region below atmospheric pressure (turbine condenser) and discharge into the atmosphere.

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