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Some concept of Turbomachinery Aerodynamics are Axial Flow Compressors, Axial Turbine Design Considerations, Blade Performance, Engine Performance Significantly, Flows Through Axial Compresso. Main points of this lecture are: Rotating Stall, Rotating Stall, Surge, Compressor Performance, Axialcompressors, Eventual Breakdown, Stable Flow, Flow Conditions, Downstream Components, Operating Range
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fact that engine operation at off-design speeds may occur closer to surge or choke depending upon its operating condition.
at all operating conditions depends upon the matching of all components of an engine within the confines of the stable operating range.
01
02 P
P
δ
m θ
performance that relate to stability:
performance characteristics of the compressor with downstream components.
state operation due to stall and surge.
Flow
Pressure ratio
Progressive throttling characteristics
stall.
blade annulus of a stall pattern, in which one or more adjacent blade passages are instantaneously stalled, then are cleared for unstalled flow as the stall cell progresses.
unloading of the blades: fatigue failure.
Propagation of rotating stall
opposite to that of the rotor revolution.
50% of the rotor frequency.
variety of reasons: off-design operation, inflow distortion, blade stagger/profile mismatch etc.
lead to surge of the compressor.
9 or more or as low as one.
the type of stall.
Flow
Pressure rise
Stall
Flow
Pressure rise
Stall
Progressive or modal stall Abrupt or spike stall
Flow
Pressure rise
Variation of stall pattern during progressive stall
Tip stall Part-span stall
Full-span stall
Deep stall