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TECHNICAL PAPERS

Mixed Flow Turbines: Inlet and Exit Flow Under Steady and Pulsating Conditions

[+] Author and Article Information
N. Karamanis, R. F. Martinez-Botas, C. C. Su

Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, London, England

J. Turbomach 123(2), 359-371 (Feb 01, 2000) (13 pages) doi:10.1115/1.1354141 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Figures

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(a) Schematic and (b) photograph of the mixed flow turbine rotor B
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Velocity measurements (LDV) setup: (a) inlet and (b) exit arrangement
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Steady performance (a) total-static efficiency vs. (b) swallowing capacity of mixed flow rotor B
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Mean velocity (m/s) contours at the inlet of rotor B, 3 mm before blade leading edge (130 deg), for 50 vs. 70 percent design speeds
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Flow angle (degrees) contours at the inlet of rotor B, 3 mm before the blade leading edge (130 deg), for 50 vs. 70 percent design speed
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Axial component of velocity Cm at peak ηt-s for rotor B at (a) 50 percent and (b) 70 percent design speed, 9.5 mm after the blade’s trailing edge
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Tangential component of velocity Cm at peak ηt-s for rotor B at (a) 50 percent and (b) 70 percent design speed, 9.5 mm after the blade’s trailing edge
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Absolute flow angle (degrees) at peak ηt-s for rotor B at (a) 50 percent and (b) 70 percent design speed, 9.5 mm after the blade’s trailing edge
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Deviation angle (degrees) at peak ηt-s for rotor B at (a) 50 percent and (b) 70 percent design speed, 9.5 mm after the blade’s trailing edge
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Instantaneous mass flow rate at the peak ηt-s of 70 percent design speed under pulsating conditions
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Instantaneous static pressure at the peak ηt-s of 70 percent design speed under pulsating conditions
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Instantaneous torque at the peak ηt-s of 70 percent design speed under pulsating conditions
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Instantaneous swallowing capacity at the peak ηt-s of 70 percent design speed at 40 Hz pulsating flow
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Instantaneous total-to-static efficiency vs. velocity ratio of rotor B for 70 percent peak ηt-s at pulsating flow 60 Hz; comparison of the treatment of the unsteady inlet temperature
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Instantaneous actual vs. isentropic work at the peak ηt-s of 70 percent design speed at 40 Hz pulsating flow
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Instantaneous total-to-static efficiency vs. velocity ratio of rotor B at atmospheric expansion and T01=Tinst under pulsating conditions at peak ηt-s of 50 percent design speed (a) 40 Hz, (b) 60 Hz, and 70 percent (c) 40 Hz and (d) 60 Hz
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Pulsating flow characteristics at the inlet of the turbine rotor
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Pulsating flow characteristics at the exit of the turbine rotor

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