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A stall that results in the complete disruption of the airflow through the compressor is referred to as a compressor surge. The severity of the phenomenon ranges from a momentary power drop barely registered by the engine instruments to a complete loss of compression in case of a surge, requiring adjustments in the fuel flow to recover normal ...
In most low-speed and low-pressure cases, rotating stall comes prior to compressor surge; [8] [9] however, a general cause-effect relation between rotating stall and compressor surge has not been determined yet. [6] On a constant speed line of a compressor, the mass flow rate decreases as the pressure delivered by the compressor gets higher.
The slightly kinked diagonal line on the main part of the map is known as the surge (or stall) line. Above this line is a region of unstable flow, which is an area best avoided. A compressor surge or compressor stall causes an abrupt reversal of airflow in the compressor. Compressor blades create a pumping action by working as airfoils.
In the case of airfoils, the pressure field modification results in an increase in pressure drag, and if severe enough will also result in stall and loss of lift, all of which are undesirable. For internal flows, flow separation produces an increase in the flow losses, and stall-type phenomena such as compressor surge, both undesirable ...
At speeds below the intake starting speed, or on aircraft with external compression intakes, engine surge or compressor stall can cause a hammershock. Above the intake starting speed, unstarts can cause stalls depending on the intake systems design complexity. [21] Hammershocks have caused damage to intakes.
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The sound produced by compressor surge is called turbo flutter and the repeated, high speed cycling will cause a cyclic torque on the compressor and may lead to increased stresses on the bearings and compressor impeller. [2] A blowoff valve is designed to release pressure in the intake system when the throttle is closed.
For a further the explanation of stall and rotating stall, refer to compressor surge. The stall zone for the single axial fan and axial fans operated in parallel are shown in the figure. [4] The Figure shows the Stall Prone Areas differently for One fan and Two fans in parallel. [4] The following can be inferred from the graph :