Piv Observation of Prewhirl Flow Upstream of a Turbopump Inducer

Shimagaki, Mitsuru; Hashimoto, Tomoyuki; Watanabe, Mitsuo; Hasegawa, S.; Yoshida, Yoshiki; Kimra, Toshiya; Nagaura, Katsuji

doi:10.1615/jflowvisimageproc.v17.i1.60

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“…It was shown that the size and location of step casing enlargement significantly affected RC instabilities. With the support of particle imaging velocimetry (PIV) and high-speed photography, Shimagaki et al [17,18] have made the further observation that the tip loading and cavitation areas can be reduced at larger tip clearances. In the previous work of the authors, Yu et al [19] numerically investigated equal pitch and varying pitch inducers within straight casings and step casings, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of Step Casings on the Cavitation Characteristics of Inducers

Han

Geng

Lian³

et al. 2022

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Rotating cavitation (RC) in inducers mainly degrades performance with unstable radial force. In this paper, the influence of step casings on cavitation performance and the instabilities of inducers were numerically investigated. Firstly, a numerical scheme was validated by means of a comparison with experimental measurements taken for an original inducer (Model O). We then performed simulations with five different step casing models (Models A–E), in which the starting locations and enlargement sizes of the step casings were altered. The interaction between tip leakage flow and main flow in the inter-blade passages was found to highly affected by cavity structure and blade loading. Considering both cavitation performance and radial force, our results suggest that Model E is an alternative improvement. In short, this study provides a standard workflow for the effective suppression of rotating cavitation in inducers by the simple adoption of the step casing configuration presented here in engineering practice.

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Section: Introductionmentioning

confidence: 99%