Numerical analysis of the effect of slit shape on the performance and cavitation instability of liquid rocket inducer

Kowata, A; Kawasaki, Shigeo; Iga, Yuka

doi:10.1088/1755-1315/1037/1/012030

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…Our research group has been working on the development of a simple method for the suppression in which slits are added to inducer blades. Three types of inducers with slits at different locations was investigated experimentally and numerically, and it was shown that vibration caused by cavitation instability was suppressed in each inducer [5][6][7][8]. However, the suppression mechanism of the slit and the influence of the location of the slit on the instability phenomena are still unknown.…”

Section: Introductionmentioning

confidence: 99%

Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer.

Ishikawa,

Nakura,

Kawasaki

et al. 2024

J. Phys.: Conf. Ser.

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Cavitation instabilities are caused by unsteady cavitation in the inducer in liquid rocket turbopumps. This phenomenon has a negative impact on pumps and must be suppressed. Our research group has proposed a method to suppress the instabilities by adding slits to the inducer blades, and previous studies was shown the effectiveness of this method. In this study, water experiments of inducers with slits at different locations were conducted. As a results, the vibration characteristics of cavitation in the slit inducers changed when the location of the slit was changed although the cavitation instabilities were successfully suppressed in all slit inducer. The visualized image of cylindrical surface of the axial flow pump was expanded into a two-dimensional plane to determine the time variation of the area of the tip leakage vortex cavitation generated in each blade. The suppression mechanism of cavitation instabilities in each slit location was discussed from the obtained unsteady image of cavity area in each blade in the slit inducers.

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Section: Introductionmentioning

confidence: 99%

Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer.

Ishikawa,

Nakura,

Kawasaki

et al. 2024

J. Phys.: Conf. Ser.

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The Similarity Law of Cavitation Number on Cavitation Instability in Liquid Rocket Inducer

TAMURA

Kondo

Kawasaki

et al. 2023

Journal of Fluids Engineering

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The influence of inducer rotation speed on the propagation characteristics of rotating cavitation and on the unsteady characteristics of cavitation in rotating cavitation and cavitation surge were examined using a three-blade inducer, which is named THK inducer, to develop the rocket engine turbopump that can operate stably over a wide operating range. The novel point of the paper is focusing on the cavitation itself, which is the cause of cavitation instabilities. The paper conducted two types of experiments using an inducer and single hydrofoils, and the dimensional and non-dimensional unsteady characteristic, which is the frequency of unsteady cavitation and the Strouhal number, were evaluated. Three types of rotating cavitation and cavitation surge were observed in the inducer. For a given cavitation number, the Strouhal number of rotating cavitation and the frequency of unsteady cavitation in cavitation surge are independent of the inducer rotation speed, respectively. The characteristic of rotating cavitation corresponds to that of cavitations arising in hydrofoils, but its characteristic of cavitation surge does not correspond. The dynamic characteristic of cavitation compliance in cavitation surge is similar to that of several rocket engine turbopumps. Therefore, it was proved that rotating cavitation is a cavity oscillation and cavitation surge is a system oscillation. Additionally, in a flow field with the same flow coefficient and different impeller rotation speed, the unsteady characteristics of cavitation instabilities are equal if the cavitation number is equal, which is named the “similarity law of cavitation number on cavitation instability”.

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Numerical analysis of the effect of slit shape on the performance and cavitation instability of liquid rocket inducer

Cited by 2 publications

References 7 publications

Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer.

Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer.

The Similarity Law of Cavitation Number on Cavitation Instability in Liquid Rocket Inducer

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