Influence of Thermodynamic Effect on Synchronous Rotating Cavitation

Yoshida, Yoshiki; Sasao, Yoshifumi; Okita, Kouichi; Hasegawa, S.; Shimagaki, Mitsuru; Ikohagi, Toshiaki

doi:10.1115/1.2745838

Cited by 25 publications

(5 citation statements)

References 7 publications

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“…Cavity length and onset cavitation number of alternate blade cavitation and rotating cavitation all decreased as the temperature increased. Yoshida et al [10] found that increasing the liquid nitrogen temperature slowed down the growth rate of cavity length of inducer tip cavitation and lowered the onset cavitation number of asymmetric attached cavitation. Kikuta et al [11] found that cavitation surge occurred in water at 296 K (R Ã % 0.01), whereas cavitation surge did not occur in liquid nitrogen at 76 K (R Ã % 7).…”

Section: Introductionmentioning

confidence: 99%

Measurement of Temperature Effects on Cavitation in a Turbopump Inducer

Kim

Song

2015

Journal of Fluids Engineering

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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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Section: Introductionmentioning

confidence: 99%

Measurement of Temperature Effects on Cavitation in a Turbopump Inducer

Kim

Song

2015

Journal of Fluids Engineering

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“…More specifically, present experiments focused on refining the characterization of the cavitation phenomena developing inside the inducer blade channels and their interactions with the flow instabilities occurring in the impeller eye. Earlier experiments to this purpose, like those carried out by Yoshida and his collaborators ( [38], [39], [40]), suitably multiplexed at the frequency of the impeller rotation the measurements of pressure transducers flush-mounted on the impeller casing in order to extract the information on the flow behavior in the blade channels. A peculiar aspect of present experiments is that the pressure transducers have been mounted both on the casing and on the hub of the inducer, in order to allow for the simultaneous analysis of the flow instabilities in the stationary and rotating reference frames.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Pace

Valentini

Pasini

et al. 2018

Journal of Fluids Engineering

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The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified, and monitored by means of the spectral analysis of the pressure measurements simultaneously performed in the stationary and rotating frames by multiple transducers mounted on the casing near the inducer eye and on the inducer hub along the blade channels. An interaction between the unstable flows in the pump inlet and in the blade channels during cavitating regime has been detected. The interaction is between a low frequency axial phenomenon, which cyclically fills and empties each blade channel with cavitation, and a rotating phenomenon detected in the inducer eye.

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“…In R-114 (in which the thermal effect existed), the cavitation region was lengthened as the rotational speed increased, but the cavitation region length was insensitive to the rotational speed in cold water (in which the thermal effect was negligible). Yoshida et al (2007Yoshida et al ( , 2009 investigated cavitation instabilities at different liquid nitrogen temperatures. They found the followings.…”

Section: Introductionmentioning

confidence: 99%

Measurement of thermal parameter and Reynolds number effects on cavitation instability onset in a turbopump inducer

Kim

Song

2017

J. Glob. Power Propuls. Soc.

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This study experimentally examines how the non-dimensional thermal parameter and Reynolds number affect cavitation instability onset in a turbopump inducer using water. Based on the time-resolved static pressure measured at the inlet of the turbopump inducer, the onset cavitation number of rotating cavitation has been determined for varying Reynolds number and non-dimensional thermal parameter values. Increasing non-dimensional thermal parameter suppresses rotating cavitation and causes a monotonic decrease in the rotating cavitation onset cavitation number. At low non-dimensional thermal parameter values (e.g., 0.0125), the onset cavitation number is independent of the Reynolds number. However, at higher values of the non-dimensional thermal parameter (e.g., higher than 0.0537), the onset cavitation number increases with increasing Reynolds number. Thus, the Reynolds number promotes rotating cavitation onset. This study provides the first assessment of the independent effects of the non-dimensional thermal parameter and Reynolds number.

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Influence of Thermodynamic Effect on Synchronous Rotating Cavitation

Cited by 25 publications

References 7 publications

Measurement of Temperature Effects on Cavitation in a Turbopump Inducer

Measurement of Temperature Effects on Cavitation in a Turbopump Inducer

Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Measurement of thermal parameter and Reynolds number effects on cavitation instability onset in a turbopump inducer

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