Numerical Analysis of the Unsteady Cavitating Flows in a 2D-Cascade and a 3D-Inducer

Ugajin, Hiroki; Kawai, Masafumi; Okita, Kohei; Ohta, Takashi; Kajishima, Takeo; Nakano, Masataka; Tomaru, Hiroshi

doi:10.2514/6.2007-5535

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…When compared with experimental results (14) , the 3D simulation for unsteady cavitating flow in a cascade predicted reasonably well the dependence of drag and lift forces on cavitation number (7) . The simulation for a 3D flow in an inducer predicted vortex rotation frequencies that were consistent with experimental results (12) .…”

Section: Introductionsupporting

confidence: 82%

“…We use Eq. 11to model the evolution of cavities because of the previous predictive success (7), (12) of simulations that include it.…”

Section: Theorymentioning

confidence: 99%

“…Simulations that include the cavitation model of Okita and Kajishima have been reasonably successful in predicting experimental trends. Their model was used in simulations of 2D and 3D unsteady cavitating flows in cascades (7), (8), (12) as well as in inducers (8), (12) . When compared with experimental results (14) , the 3D simulation for unsteady cavitating flow in a cascade predicted reasonably well the dependence of drag and lift forces on cavitation number (7) .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Introductionsupporting

confidence: 82%

“…We use Eq. 11to model the evolution of cavities because of the previous predictive success (7), (12) of simulations that include it.…”

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Ohta

Sakai

Okabayashi

et al. 2011

JFST

Self Cite

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The cavitation behavior with short length blades in centrifugal pump

Thai

Lee

2010

J Mech Sci Technol

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A CFD code with 2-D cascade model was developed to predict the cavitation behavior around the impeller blades of impeller in a centrifugal pump. The governing equations are the two-phase Reynolds Averaged Navier-Stokes equations in a homogeneous form in which both liquid and vapor phases are treated as incompressible fluid. To close the model, a standard k-ε turbulence model is introduced. And the mass transfer rates between liquid and vapor phases are implemented as well. The validations are carried out by comparing with reference data in impeller of a centrifugal pump impeller. The cavitation characteristics of current centrifugal pumps is tested at an ondesign point (V=8 m/s) and two off-design points (V=20 m/s and V=30 m/s), respectively. The criteria of cavitation and flow instability around blades are presented. The results show that the current centrifugal pump can safely operate without cavitation at on-design point. Also, the simulation shows cavitation develops inhomogeneously among the blades at off-design points. Moreover, the effects of additional blades in the impeller are studied as well. From the numerical results, it is expected that a half-length blade is the optimum configuration as additional blades in cavitation point of view.

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Study on the Cavitating Flows in a Turbopump Inducer

Choi

Kim

2015

Journal of Propulsion and Power

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Numerical Analysis of the Unsteady Cavitating Flows in a 2D-Cascade and a 3D-Inducer

Cited by 3 publications

References 13 publications

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

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

The cavitation behavior with short length blades in centrifugal pump

Study on the Cavitating Flows in a Turbopump Inducer

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