Cavitation Tests on Six Profiles for Blade Elements

Numachi, Fukusaburō; TSUNODA, Kenji; CHIDA, Ichiro

doi:10.1299/kikai1938.17.60_1

Cited by 2 publications

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“…At this time, an inlet flow velocity is U 0 = 10m/s and a Reynolds number is R e = 7.0 × 10 5 . Time-averaged lift and drag coefficients C L , C D were calculated from numerical results, and the comparison with experimental data at the same Reynolds number(see, for example, Numachi, Tsunoda and Chida(1949)) is shown in Fig.1. Generally, it is known that C L decreases largely when σ becomes smaller than a certain critical value (that is so-called cavitation break-down).…”

Section: Validation Of Present Methods (Comparison With Experimental Rmentioning

confidence: 99%

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

Iga

Nohmi

Gotō

et al. 2003

Journal of Fluids Engineering

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Abstract2-D unsteady cavity flows through hydrofoils in cascade which is the most fundamental element of turbomachinery are numerically calculated. In particular, attention was paid to instability phenomena of the sheet cavity in transient cavitation condition and the mechanism of break-off phenomenon was examined. A TVD MacCormack's scheme employing a locally homogeneous model of compressible gas-liquid two-phase media was applied to analyze above cavity flows. The present method permits us to treat the whole cavitating/noncavitating unsteady flow field. By analyzing numerical results in detail, it became clear that there are at least two mechanisms in the break-off phenomena of sheet cavity; one is that re-entrant jets play a dominant role in such a break-off phenomenon, and the other is that pressure waves propagating inside the cavity bring about an another type of break-off phenomenon accompanied with cavity surface waves.

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Section: Validation Of Present Methods (Comparison With Experimental Rmentioning

confidence: 99%

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

Iga

Nohmi

Gotō

et al. 2003

Journal of Fluids Engineering

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Investigation of Interaction between Vortices and Cavitation in a Turbulent Shear Layer

Ohta

Sakai

Okabayashi

et al. 2011

JFST

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We performed numerical simulations of a non-steady separated shear layer with and without cavitation to examine the effect on flow dynamics. Particular focus was given to the interaction between vortices and cavitation. In the simulations, streamwise and spanwise vortices generated by the instability of a shear layer flow, typical features in such a flow field, were formed further upstream in cavitating than in non-cavitating flows. In cavitating flows, the vortex shedding frequency and the Reynolds stresses increase, and we observed vortex weakening caused by cavitation. We found that a Burgers-type vortex can become the origin of a cavity. Contrarily, the growth of the cavity attenuates the corresponding vortex. We described this influence of a cavity on a streamwise vortex with a simple inviscid model.

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Cavitation Tests on Six Profiles for Blade Elements

Cited by 2 publications

References 0 publications

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

Numerical Study of Sheet Cavitation Breakoff Phenomenon on a Cascade Hydrofoil

Investigation of Interaction between Vortices and Cavitation in a Turbulent Shear Layer

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