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Instability of airflow in an axial or centrifugal compressor caused by conditions of low flow and high pressure.



Related Terms

WILLANS LINE

The Willians line is a plot of throttle flow versus the load, usually expressed in kilowatts; generally it is a straight line except for low and high loads. The Willians line is used to show steam rates at different loads on the turbine.

UNLOADER

A device in a compressor for equalizing high and low side pressures when the compressor stops and for a brief period after it starts in order to decrease the starting load on the motor.

CAPILLARY TUBE

A tube of small internal diameter used as a liquid refrigerant flow control and pressure reducer between high and low pressure sides. Also used to transmit pressure from the sensitive bulb of some temperature controls to the operating element.

AXIAL FLOW COMPRESSOR

A compressor that uses rotor blades shaped like airfoils that give the air a high velocity and push it into subsequent stationary blade passages that convert the velocity energy into pressure. This process is repeated through several stages. The airflow movement is axial.

BARREL COMPRESSOR

A centrifugal compressor having a barrel-shaped housing.

REVERSING FALLS

Falls which flow alternately in opposite directions in a narrow channel in the St. John River, New Brunswick, Canada, due to the large range of tide and a constriction in the river. The direction of flow is upstream or downstream according to whether it is high or low water on the outside, the falls disappearing at the half- tide level.

TRAFFIC SEPARATION ZONE

A routeing measure to separate the flow of vessels in areas of high traffic density, usually the approaches to busy harbours. Vessels should enter and exit the zones at their termination points.

DURATION OF RISE

Duration of rise is the interval from low water to high water, and duration of fall is the interval from high water to low water. Together they cover, on an average, a period of 12.4 2 hours for

PHASE REDUCTION

Processing of observed high and low waters to obtain quantities depending upon the phase of the moon, such as the spring and neap ranges of tide. Formerly this process was known as SECOND REDUCTION. Also applicable to tidal currents.

CENTRIFUGAL MOLECULAR STILL

A device used for molecular distillation; material is fed to the center of a hot, rapidly rotating cone housed in a chamber at a high vacuum; centrifugal force spreads the material rapidly over the hot surface, where the evaporable material goes off as a vapor to the condenser.

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