Normaly, every centrifugal type comprssors provided with an antisurge valve or surge control valve. when compressor handelled with surge, the proveded surge control valve will become open automatically and the cycle will repeated till the comprssor is in surge.
To calculate surge in a compressor, you would need to determine the maximum flow rate and pressure that the compressor can handle without stalling. This can be done through performance mapping or testing. Surge is typically defined as the flow rate at which the compressor stalls due to flow reversal.
Compressor surges can happen when there is a line spike, during storms or when other equipment is plugged in on the same electrical line. An industrial surge protector can help eliminate power surges.
The centrifugal flow compressor has a single or two stage unit using an impeller. The axial flow compressor is a multi-stage unit using alternate rows of rotating (rotor) blades and stationary (stator) vanes.
Capacity control in large centrifugal refrigerant compressors is typically achieved through methods such as variable inlet guide vanes, variable speed drives, and slide valves. These methods help adjust the flow of refrigerant into the compressor to modulate its capacity based on changing system requirements.
Rotary compressors use rotating motion to compress air within a closed system, while centrifugal compressors rely on centrifugal force to increase gas pressure. Rotary compressors are typically more compact and can provide higher pressure ratios, while centrifugal compressors are better suited for high-volume applications with relatively low pressure ratios.
Surge is a point when compressor is not add enough energy to overcome system resistance.
Compressor surge only occur in centrifugal compressors. reciprocating compressor don't as they increase pressure by volume reduction, unlike centrifugal compressors where they increase pressure by converting kinetic energy to potential energy (pressure).
Turndown: The allowable operating range for the centrifugal compressor between the design point and the surge line at any given speed for a fixed compressor head.
This relationship is the reason advances in turbines and axial compressors often find their way cutaway showing an axi-centrifugal compressor gas turbine.
Centrifugal and axial compressors will surge when forward flow through the compressor can no longer be maintained, due to an increase in pressure across the compressor, and a momentary flow reversal occurs. Once surge occurs, the reversal of flow reduces the discharge pressure or increases the suction pressure, thus allowing forward flow to resume again until the pressure rise again reaches the surge point. This surge cycle will continue until some change is made in the process or compressor conditions.
Surge is a flow instability that results in a global collapse of flow through the compressor. Compressors do not continue to operate or flow once surge has occurred. Surge should be avoided. Surge is not the rough operation, vibration, pulsation, or noise that develops at low flow conditions. Surging is a momentary reversal of flow.When the pressure in the centrifugal comp. increases,the mass flow rate decreases.There is a limit up to which the pressure can be increased,then after the flow becomes instable and momentary reversal of flow take place,vibrations are produced and mechanical damage occurs.
Centrifugal compressor
Centrifugal compressor
Centrifugal compressor
test
In a centrifugal compressor, the energy is transferred using a set of impeller blades and balancing drums. These balancing drums can be on the inlet or outlet side of the compressor and help to space out the energy in the compressor.
professor Auguste Rateau invented the centrifugal compressor,by 1899