The Role of the Compressor in Limiting Automotive Gas Turbine Acceleration

Amann, Charles A.; Nordenson, G. E.

doi:10.4271/610153

Cited by 4 publications

(2 citation statements)

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“…Although, in most centrifugal pumping systems, the transition from mild to deep surge is found to occur, as summarized by Greitzer (1981), either without noticeable rotating stall or with rotating stall in the (vaned) diffuser, the authors believe that mechanisms treated here are not a unique case. For example the data reported by Amann and Nordenson (1961) show a similar behaviour2.…”

Section: Conclusion and Consequences For Surge Margin Improvementmentioning

confidence: 66%

Impeller Rotating Stall as a Trigger for the Transition From Mild to Deep Surge in a Subsonic Centrifugal Compressor

Ribi¹,

Gyarmathy²

1993

Volume 3A: General

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The present paper concerns the transition from mild to deep surge in a single stage centrifugal compressor using a vaned diffuser. Time-resolved measurements of the mass flow rate and the static pressures at various locations of the compressor were analyzed for different diffuser geometries and different operating points in the compressor map. When the throttle valve was gradually closed at an impeller tip Mach number (Mu) above 0.4, the compressor showed first mild and then deep surge whereas at Mu=0.4 rotating stall was the dominant instability. This single-cell rotating stall was identified to be caused by the impeller. During mild surge at higher Mach numbers the instantaneous flow and pressure traces showed that the overall flow at the stage inlet intermittently dropped below the critical value associated with the occurence of impeller rotating stall. Rotating stall appeared for a while but vanished as soon as the flow increased again. With further throttling, however, a threshold was reached at which rotating stall triggered deep surge. The results show that triggering only occurred if the flow deficiency causing rotating stall persisted long enough to permit the stall cell to make at least one or two revolutions.

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Section: Conclusion and Consequences For Surge Margin Improvementmentioning

confidence: 66%

Impeller Rotating Stall as a Trigger for the Transition From Mild to Deep Surge in a Subsonic Centrifugal Compressor

Ribi¹,

Gyarmathy²

1993

Volume 3A: General

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“…No adequate theoretical approach exists to satisfactorily predict the onset of compressor instabilities. Experimental data indicates that surge is usually preceded by rotating stall in the vaneless diffuser or in the impeller (2,3,4). Zones of stable operation and mild surge regions have also been observed between the onset of rotating stall and violent audible surge.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Variable Geometry on the Operating Range and Surge Margin of a Centrifugal Compressor

1976

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Two variable geometry techniques have been applied to a small turbocharger compressor, with the objective of trying to move the peak pressure ratio operating point to lower flow rates, thereby yielding a broad flow range map. Variable prewhirl guide vanes and variable vaneless diffuser passage height have been studied separately. The results obtained with both techniques are compared and the relative merits and demerits with respect to improved flow range and isentropic efficiency penalties are considered.

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