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Research Papers: Multiphase Flows

Measurement of Temperature Effects on Cavitation in a Turbopump Inducer

[+] Author and Article Information
Junho Kim

School of Mechanical
and Aerospace Engineering,
Seoul National University,
Seoul 151-744, South Korea
e-mail: kimjonah@snu.ac.kr

Seung Jin Song

Mem. ASME
School of Mechanical
and Aerospace Engineering,
Seoul National University,
Seoul 151-744, South Korea
e-mail: sjsong@snu.ac.kr

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 21, 2014; final manuscript received June 6, 2015; published online August 20, 2015. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 138(1), 011304 (Aug 20, 2015) (7 pages) Paper No: FE-14-1462; doi: 10.1115/1.4030842 History: Received August 21, 2014

Temperature effects on the critical cavitation number and rotating cavitation in a turbopump inducer have been experimentally investigated in water. Static pressures upstream and downstream of the inducer have been measured to determine the cavitation performance, and cavitation instabilities have been detected using unsteady pressure sensors and a high-speed camera. Two kinds of cavitation instabilities have been identified—rotating cavitation and asymmetric attached cavitation. To quantify temperature effects, nondimensional thermal parameter has been adopted. Increasing water temperature, or increasing nondimensional thermal parameter, lowers the critical cavitation number. Increasing nondimensional thermal parameter also shifts the onset of rotating cavitation to a lower cavitation number and reduces the intensity of rotating cavitation. However, for values larger than 0.540 (340 K, 5000 rpm), the critical cavitation number and the rotating cavitation onset cavitation number become independent of the nondimensional thermal parameter. The onset of the head coefficient degradation correlates with the onset of rotating cavitation regardless of temperature.

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Topics: Cavitation
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Figures

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Fig. 1

Seoul National University turbopump inducer experimental facility

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Fig. 3

Test section showing the locations of static and unsteady pressure transducers

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Fig. 4

Noncavitating performance curves at 298 K (Σ*  = 0.0116)

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Fig. 5

Repeatability test for cavitation performance (φd  = 0.096 and T = 298 K (Σ*  = 0.0116))

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Fig. 6

The power spectral density of inducer inlet pressure fluctuations (φd  = 0.096 and Σ*  = 0.0116 (T = 298 K))

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Fig. 7

High-speed images of symmetric cavitation. Same length cavities are attached to blade rotating synchronous speed with the inducer (σ = 0.12, φd  = 0.096, and Σ*  = 0.0116 (T = 298 K)).

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Fig. 8

The power spectral density, phase difference, and coherence of unsteady pressure fluctuations from two pressure transducers with 45 deg angular separation in upstream of the inducer (σ = 0.068, φd  = 0.096, and Σ*  = 0.0116 (T = 298 K))

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Fig. 9

The power spectral density, phase difference, and coherence of unsteady pressure fluctuations from two pressure transducers with 45 deg angular separation in upstream of the inducer (σ = 0.046, φd  = 0.096, and Σ*  = 0.0116 (T = 298 K))

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Fig. 10

High-speed images of asymmetric attached cavitation. One shorter cavity (left) and two longer cavities (center and right) are attached to blade and rotate at same speed with rotational speed (σ = 0.047, φd  = 0.096, and Σ*  = 0.0116 (T = 298 K)).

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Fig. 14

The rotating cavitation onset cavitation number and the critical cavitation number versus the nondimensional thermal parameter at φ/φd  = 1.0

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Fig. 11

Cavitation performance and the amplitude of unsteady pressure fluctuation at the rotating cavitation frequency (φd = 0.096 and Σ*  = 0.0116 (T = 298 K))

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Fig. 12

Cavitation performance of various nondimensional thermal parameters (φd  = 0.096)

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Fig. 13

The power spectral density of unsteady pressure fluctuation at various temperature range (Σ*  = 0.054 (313 K)–1.80 (357 K))

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