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TECHNICAL PAPERS

Effect of Unsteady Stator Wake—Rotor Double-Leakage Tip Clearance Flow Interaction on Time-Average Compressor Performance

[+] Author and Article Information
Borislav Todorov Sirakov, Choon-Sooi Tan

MIT Gas Turbine Laboratory, Cambridge, MA 02139

J. Turbomach 125(3), 465-474 (Aug 27, 2003) (10 pages) doi:10.1115/1.1574822 History: Received January 01, 2002; Revised January 31, 2003; Online August 27, 2003
Copyright © 2003 by ASME
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References

Figures

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Stator wakes description
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Effect of upstream wake on rotor total-to-static pressure rise coefficient showing the benefit of upstream stator wake-rotor tip clearance flow interaction on time-average performance
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Beneficial effect of strong upstream stator wake—rotor tip clearance flow interaction on rotor static pressure rise coefficient
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Beneficial effect of strong upstream stator wake—rotor tip clearance flow interaction on tip region loss generation
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Beneficial effect of strong upstream stator wake—rotor tip clearance flow interaction on tip region blockage generation
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Beneficial effect of upstream unsteadiness increases monotonically with upstream wake defect. (Static pressure rise coefficient is normalized by wake velocity defect to obtain a single linear dependence on operating condition for all wakes.)
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Angle between tip clearance flow exit direction and axial direction in the relative frame
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Chordwise distribution of tip clearance mass flow and stream wise velocity (in direction of main flow relative to blade) for steady and unsteady cases. (Total tip clearance mass flow is 2% of blade passage mass flow.)
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Relative stagnation pressure of tip clearance fluid exiting the tip gap. On a time-average basis unsteady tip clearance flow exits the tip gap with less relative stagnation pressure defect.
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Tip clearance flow behavior in steady and unsteady environment (98% cut); x-axis is in the axial direction and y-axis is in the circumferential direction—(a) steady (tip clearance fluid from blade 1 passes through tip gap of blade 2), (b) instantaneous unsteady (no tip clearance fluid from blade 1 passes through tip gap of blade 2)
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Upstream wakes appear as normal jets directed away from the rotor suction side in the rotor relative frame
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Instantaneous disturbance velocity field in the rotor (50% cut). The upstream wakes impinge on the pressure side and stagnation points appear; x-axis is in the axial direction and y-axis is in the circumferential direction.
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Instantaneous position of pressure pulses in the rotor passage (50% Cut). Pressure pulses appear as a result of the wake jet stagnation on the pressure surface.
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Location of isolated pressure pulse and its turning effect on tip clearance flow (98% span cuts)
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Fluid scenario to explain the reduction of tip clearance fluid double-leakage and enhancement of performance. Pressure pulses prevent double-leakage during selected instants of time in a cycle.
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Relative stagnation pressure defect is shown with dotted lines in the tip gap for different instants of time in a cycle. Average steady and unsteady values are shown with solid lines.
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Compound nozzle flow for two streams Grahic Jump Location
Control volume mixing analysis for prediction of tip clearance loss
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Passage blockage and loss coefficient dependence on stator wake amplitude oscillation frequency (bpf denotes blade passing frequency)

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