How does compressor surge happen?
Aerodynamically speaking, the air separates from the back of the compressor blades, allowing some air to escape back out through the compressor. This causes the characteristic fluttering sound of compressor surge (kind of like blowing through a fan), and also results in pressure pulses in the intercooler piping.
What is surging and choking of compressor?
Surge is a violent flow reversal that occurs when the process restricts the compressor flow below a certain minimum value. Choke occurs when the process does not create enough restriction to the compressor flow and the compressor operates at its maximum flow for a given performance level.
What is rise to surge?
The achievable rise to surge is directly influenced by the required compressor operating range. The HRTS is a measure of the rise in the head (at constant speed) when the operating point moves toward the surge line. Other common terms related to HRTS include pressure rise to surge, and pressure ratio rise to surge.
What is surging in axial compressor?
Compressor surge is a form of aerodynamic instability in axial compressors or centrifugal compressors. The term describes violent air flow oscillating in the axial direction of a compressor, which indicates the axial component of fluid velocity varies periodically and may even become negative.
What is Surge test in compressor?
A compressor undergoes surge testing to optimize the calibration of anti-surge control systems so that they fully protect a compressor from potentially damaging surge conditions while maximizing the compressor’s turndown (operating range).
How do you control a compressor surge?
6 Ways to to Avoid Centrifugal Compressor Surge
- Larger Anti-surge Valve (ASV) Size with a Quick Opening Valve.
- Suction and Discharge Pipe Re-Routing.
- Re-Positioning Anti-surge Tap off- Point.
- Slowing Compressor Speed during Coast down.
- Discharge Side Gas Flaring.
- Hot Gas Recycle Valve Installation.
How is compressor surge calculated?
The general formula used to calculate this is expressed as compressor time on/ (time on + time off) = Duty Cycle percentage. For example, if a compressor is said to use a 100% duty cycle, that would mean that the compressor provides 25 CFM and 125 PSI for 100% of the time it is in use.
When does surge occur in an axial compressor?
surge is a dynamic instability that occurs in dynamic compressors. surge can also occur in axial and centrifugal pumps and blowers, but the occurrence is less fre- quent and the damage less severe. pump surge seldom occurs except infrequently during cavitation and two-phase flow (ref.
How is a compressor stall related to a compressor surge?
Compressor stall • A compressor stall is a local disruption of the airflow in a gas turbine or turbocharger compressor. It is related to compressor surge which is a complete disruption of the flow through the compressor.
What is the surge line in pressure flow rate?
In the plot of pressure-flow rate the line separating graph between two regions- unstable and stable is known as the surge line. This line is formed by joining surge points at different rpms. 11.
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