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Research Papers

Prediction of Deswirled Radial Inflow in Rotating Cavities With Hysteresis

[+] Author and Article Information
David May

Rolls-Royce Canada,
Montreal, PQ H9P 1A5 Canada

John W. Chew

University of Surrey,
Guildford, Surrey GU2 7XHUK

Timothy J. Scanlon

Rolls-Royce plc,
Derby DE24 8BJUK

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received September 10, 2012; final manuscript received September 19, 2012; published online June 10, 2013. Assoc. Editor: David Wisler.

J. Turbomach 135(4), 041025 (Jun 10, 2013) (7 pages) Paper No: TURBO-12-1187; doi: 10.1115/1.4007741 History: Received September 10, 2012; Revised September 19, 2012

Deswirl nozzles are sometimes used in turbomachinery to reduce the pressure drop when air is drawn radially inwards through a rotating cavity. However, this can lead to nonunique steady state solutions with operating conditions achieved depending on how the steady point is approached. In the present study, a novel transient, 1D model of flow in a rotating cavity has been created. The model was validated for two distinct cases: a smooth rectangular cavity and an engine-representative case. The transient model reproduced experimentally observed hysteresis, discontinuity in operating characteristics, and regions where no steady-state solution could be found. In the case of the engine-representative rig, part of the flow characteristic could not be obtained in testing. This was determined to be due to the interaction of the negative resistance region of the vortex and the flow-modulating valve characteristic. Measures that allow the full capture of the flow characteristic in rig testing are identified. These results show that inclusion of transient rotating flow effects can be important in turbomachinery air systems modeling. To the authors' knowledge, this is the first model to capture these effects.

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References

Figures

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Fig. 1

Schematic of radial inflow in a rotating cavity [5]

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Fig. 2

Tangential velocity profiles for fluid entering a drum at half disk speed

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Fig. 3

Cumulative moment profiles for fluid entering a drum at half disk speed

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Fig. 4

Smooth rectangular cavity flow characteristic

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Fig. 5

Axial compressor disk cavity rig geometry [6]

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Fig. 6

Compressor cavity flow characteristic for Hößler's [7] conditions

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Fig. 7

Compressor cavity flow characteristic for Edwards' [6] conditions

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Fig. 8

Input and response of the transient compressor cavity model

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Fig. 9

Valve opening and closing behavior of the compressor cavity rig

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Fig. 10

Variation of flow rate with valve opening for the compressor cavity model

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Fig. 11

Intersection of vortex flow characteristic with modified downstream flow conditions

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