Active Stabilization of Surge in an Axicentrifugal Turboshaft Engine

[+] Author and Article Information
E. B. Nelson, J. D. Paduano, A. H. Epstein

Gas Turbine Laboratory, Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Turbomach 122(3), 485-493 (Feb 01, 1999) (9 pages) doi:10.1115/1.1304915 History: Received February 01, 1999
Copyright © 2000 by ASME
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LTS-101 gas producer: note plenum above impeller shroud
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Circumferential tap locations within diffuser
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Speed lines at 95 percent corrected speed
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Open-loop unsteady pressure traces 2 s prior to surge. See Fig. 2 for location of vane cavity pressure taps. Perturbation magnitudes given in percent compressor exit pressure.
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Power spectral density of vane cavity pressure. Bold=immediately prior to surge; solid=0.34 percent in mass flow from surge; dashed=4.7 percent in mass flow from surge.
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Static pressure data from Fig. 4, low-pass filtered at 30 Hz to highlight the surge mode (top), and band-pass filtered with a center frequency of 70 Hz to highlight the acoustic mode (bottom)
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Transfer functions from valve command to inlet static pressure
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SIMO transfer function fit for best compensator designs: (a) valve command to compressor inlet static pressure; (b) valve command to diffuser throat static pressure
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Control effectiveness in suppressing surge mode, at open-loop surge mass flow: (a) inlet static pressure; (b) vane cavity static pressure
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Compressor range extension with active stabilization of surge
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Compression system geometry for lumped-parameter surge model
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Acoustic model of LTS-101 with acoustic ducts and plenum
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Block diagram of control system used for specification of design constraints
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(a) Closed-loop transfer function from r to u (solid); shaped by W2−1 (dashed); (b) closed-loop transfer function from r to y (solid); shaped by W3−1 (dashed)
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Design plant model showing eigenvalue perturbation circles; note that surge eigenvalues are neutrally stable
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Compensator transfer functions: (a) compressor inlet static pressure to valve command (one of two similar transfer functions); (b) diffuser throat static pressure to valve command




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