Rotating Choke in Cavitating Turbopump Inducer

[+] Author and Article Information
Yury A. Semenov, Akira Fujii, Yoshinobu Tsujimoto

Osaka University, Graduate School of Engineering Science, 1-3 Machikaneyama, Toyonaka 560-8581, Osaka, Japan

J. Fluids Eng 126(1), 87-93 (Feb 19, 2004) (7 pages) doi:10.1115/1.1637926 History: Received July 25, 2002; Revised September 10, 2003; Online February 19, 2004
Copyright © 2004 by ASME
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The “choke” phenomenon
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The spectrum of the inlet pressure fluctuation and the phase difference of the signals from two pressure transducers located apart by 144 degrees circumferentially. Uncertainties: frequency ±2 Hz, phase difference ±5 degree
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Scheme of the cavity-wake flow: a) physical plane: the cavity OAH; the mixing region AEGH; the near wake region ETCG; b) linearized plane
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Cavitation performances of the cascade and region of instability for various angles of attack: stagger angle 80 deg, solidity 2.35. Uncertainty ψst±0.005.
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Head performance of the cascade for various values of cavitation number and region of instability: stagger angle 80 deg, solidity 2.35. Uncertainty ψst±0.005.
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Propagation velocity ratio for the rotating cavitation and rotating choke. Uncertainty ω/Ω±0.01
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The unsteady cavity shapes at the onset point of cavitation instability; ϕ=0.095; stagger angle 10 deg; solidity of the cascade 2.35. The amplitude of oscillation of cavity length is assumed to be l̃c=0.3l̄c. Cavity is shown by white area and the density in the mixing region and wake is shown by the darkness. Uncertainties: x/h±0.001,y/h±0.001.a) rotating cavitation (σ=0.26);b) rotating choke (σ=0.077)
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Head dependence for low and high cavitation number
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Suction performance of the inducer of the LE-7A LH2 turbopump. Uncertainties: σ±0.002,dPind/N ⁁2*10±0.03E-07 and DRF±0.2E+02
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Cavity length (closed model, lclosed) and total length of cavity and mixing region (wake model, lm) versus parameter σ/(2α); the gray bars show the range of instability; blade angle 10 deg, solidity 2.35, angle of attack 4 deg. Uncertainties: lc/h±0.001,lm/h±0.001



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