دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: compression of air or gas that exists when no heat is transferred between the air or gas and surrounding bodies (such as the cylinders and pistons in a compressor). It is characterised by an increase in temperature during compression and a decrease in temperature during expansion.

n: a special type of centrifugal compressor with a barrel-shaped housing.

n: a compressor in which the flow of gas to be compressed is moved away from the centre rapidly, usually by a series of blades or turbines. It is a continuous-flow compressor with a low pressure ratio and is used to transmit gas through a pipeline. Gas passing through the compressor contacts a rotating impeller, from which it is discharged into a diffuser, where its velocity is slowed and its kinetic energy changed to static pressure. Centrifugal compressors are nonpositive-displacement machines, often arranged in series on a line to achieve multistage compression.

n: a device mounted on the cylinder of a compressor that allows the amount of clearance space to be adjusted. Clearance space may have to be adjusted to compensate for increases or decreases in the load on the compressor.

n: in a reciprocating compressor, the volume between the top of the piston and the cylinder head with the piston at the top of its stroke.

n: The device that provides air for pneumatic system of drill fixture. Consisted by air compressor, processing unit of compressed air, gas receiver and controlling apparatus.

n: 1. the ratio of the absolute discharge pressure from a compressor to the absolute intake pressure. 2. the ratio of the volume of an engine cylinder before compression to its volume after compression. For example, if a cylinder volume of ]0 cubic inches (10 cubic centimetres) is compressed into] cubic inch (] cubic centimetre),the compression ratio is ]0:].

the ratio of the absolute outlet pressure of a compressor to the absolute inlet pressure.

n: a device that raises the pressure of a compressible fluid such as air or gas. Compressors create a pressure differential to move or compress a vapour or a gas, consuming power in the process. They may be positive-displacement compressors or nonpositive-displacement compressors. See centrifugal compressor;jet compressor;reciprocating compressor.

a type of pump that increases the pressure of gas. Commonly used as a production rate increaser by increasing the gas pressure delivered from low pressure gas wells to enter the pipe line. The intake into the compressor lowers the wellhead pressure creati