Experimental study on rotating cavitation of rocket propellant pump inducers

Hashimoto, Tomoyuki; Yoshida, Makoto; Watanabe, Mitsuo; Kamijo, Kenjiro; Tsujimoto, Yoshinobu

doi:10.2514/6.1996-2674

Cited by 18 publications

(24 citation statements)

References 4 publications

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“…Figure 8 shows a comparison of theoretical and experimental results for Mode II. Mode II corresponds to the backward rotating cavitation which has been rarely found, there being only one report, that of Hashimoto et al (1997). The value of propagation velocity ratio k% in the present study is not very different from the experimental value.…”

Section: Effects Of Blade and Number Of Cellscontrasting

confidence: 59%

Analysis of Rotating Cavitation in a Finite Pitch Cascade Using a Closed Cavity Model and a Singularity Method

Watanabe

Sato

Tsujimoto

et al. 1999

Journal of Fluids Engineering

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A new method is proposed for the stability analysis of cavitating flow. In combination with the singularity method, a closed cavity model is employed allowing the cavity length freely to oscillate. An eigen-value problem is constituted from the boundary and supplementary conditions. This method is applied for the analysis of rotating cavitation in a cascade with a finite pitch and a finite chordlength. Unlike previous semi-actuator disk analyses Watanabe et al., 1997a), it is not required to input any information about the unsteady cavitation characteristics such as mass flow gain factor and cavitation compliance. Various kinds of instability are predicted. One of them corresponds to the forward rotating cavitation, which is often observed in experiments. The propagation velocity ratio of this mode agrees with that of experiments, while the onset range in terms of cavitation number is larger than that of experiments. The second solution corresponds to the backward mode, which is also found in semi-actuator disk analyses and identified in an experiment. Other solutions are found to be associated with higher order cavity shape fluctuations, which have not yet been identified in experiments. Transactions of the ASME Downloaded From: http://fluidsengineering.asmedigitalcollection.asme.org/ on 06/13/2015 Terms of Use: http://asme.org/terms Conclusions A new method was proposed for the stability analysis of cavitating flow. This method was applied for the analysis of rotating Journal of Fluids Engineering DECEMBER 1999, Vol. 121 / 839 Downloaded From: http://fluidsengineering.asmedigitalcollection.asme.org/ on 06/13/2015 Terms of Use: http://asme.org/terms

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Section: Effects Of Blade and Number Of Cellscontrasting

confidence: 59%

Analysis of Rotating Cavitation in a Finite Pitch Cascade Using a Closed Cavity Model and a Singularity Method

Watanabe

Sato

Tsujimoto

et al. 1999

Journal of Fluids Engineering

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“…4, in the region of Q/Q d = 1.03, unsteady pressure fluctuation of the 0.6 × ω s component Fig. 10, which is different from the characteristics of the head in the case of a rotating stall type phenomenon (0.4 × ω s ) observed by Shimura (8) et al Table 1 This paper has mentioned unsteady pressure fluctuations that were observed in the inducer inlet and middle (4), (5) were not components that enormously affected the inducer head. However, synchronous rotating cavitation (1.0 × ω s ) leads to drastically the inducer head breaking out at once and an increase of the synchronous shaft vibration.…”

Section: Synchronous Rotating Cavitationmentioning

confidence: 49%

“…The inducer is required to have high suction performance. The relation between the improvement of the suction performance and the suppression (1) - (4) of inducer instabilities caused by cavitation has been studied for the last decade.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Pressure Fluctuations in an Inducer

Shimagaki

Hashimoto

Watanabe

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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In this investigation, pressure fluctuations in an inducer were observed in order to examine the characteristics of unsteady cavitation at lower cavitation coefficients. From the spectrum analysis, it was confirmed that the pressure fluctuations occurred with the frequency of 0.6×ω s (ω s , shaft rotational frequency), 1.0×ω s , 1.1 ∼ 1.3×ω s and also 2.1×ω s . The 0.6×ω s was caused by the rotating phenomena in an inducer rotational direction. The 1.1 ∼ 1.3 × ω s was caused by the super-synchronous rotating cavitation. The 2.1 × ω s was caused by rotating cavitation in the counter direction. In addition, the amount of head reduction of the inducer caused by the synchronous cavitation (1.0×ω s ) depended on the cavity pattern of the blades.

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“…Hashimoto et al (7) indicated previously that shaft vibration is considered to affect occurrence of AC. However, there has never been a report in which the amplitude of shaft vibration is investigated to determine its effect on the occurrence of AC.…”

Section: Introductionmentioning

confidence: 99%

Effects of Shaft Vibration on Occurrence of Asymmetric Cavitation in Inducer

Kobayashi

2006

JSME international journal. Ser. B, Fluids and thermal engineer

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In the present study, I investigate the effects of shaft vibration on asymmetric cavitation, which is one of the instability phenomena on cavitating 3-bladed inducers. Inducer tests under various unbalance conditions are performed to clarify the effects of shaft vibration. The following results are obtained. (1) The amplitude of shaft vibration has a strong effect on the occurrence of asymmetric cavitation, and in an inducer with a large vibration amplitude, asymmetric cavitation easily occurs. (2) The phase of the small-tip clearance caused by shaft vibration coincides with the position of the small cavity. In this study, it is shown that suppression of shaft vibration amplitude is extremely important in preventing harmful asymmetric cavitation.

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Experimental study on rotating cavitation of rocket propellant pump inducers

Cited by 18 publications

References 4 publications

Analysis of Rotating Cavitation in a Finite Pitch Cascade Using a Closed Cavity Model and a Singularity Method

Analysis of Rotating Cavitation in a Finite Pitch Cascade Using a Closed Cavity Model and a Singularity Method

Unsteady Pressure Fluctuations in an Inducer

Effects of Shaft Vibration on Occurrence of Asymmetric Cavitation in Inducer

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