Analysis of ventilation regimes of the oblique wedge-shaped surface piercing hydrofoil during initial water entry process

• Autorzy: Ghadimi P. , Javanmardi N.
• Języki publikacji: EN

Abstrakty

EN

The suction side of a surface piercing hydrofoil, as a section of a Surface Piercing Propeller (SPP), is usually exposed to three phases of flow consisting air, water, and vapour. Hence, ventilation and cavitation pattern of such section during the initial phase of water entry plays an essential role for the propeller’s operational curves. Accordingly, in the current paper a numerical simulation of a simple surface piercing hydrofoil in the form of an oblique wedge is conducted in three-phase environment by using the coupled URANS and VOF equations. The obtained results are validated against water entry experiments and super-cavitation tunnel test data. The resulting pressure curves and free surface profiles of the wedge water entry are presented for different velocity ratios ranging from 0.12 to 0.64. Nondimensional forces and efficiency relations are defined in order to present the wedge water entry characteristics. Congruent patterns are observed between the performance curves of the propeller and the wedge in different fully ventilated or partially cavitated operation modes. The transition trend from fully ventilated to partially cavitated operation of the surface piercing section of a SPP is studied and analyzed through wedge’s performance during the transitional period.

Słowa kluczowe

EN

emi-submerged propeller; wedge water entry; ventilation pattern; free surface profile

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2018
• Tom: nr 1
• Strony: 24--34
• Opis fizyczny: Bibliogr. 47 poz., rys., tab.

Twórcy

autor

Ghadimi P.

• Amirkabir University of Technology 424 Hafez Ave., 3314 Tehran Islamic Republic of Iran

autor

Javanmardi N.

• Amirkabir University of Technology 424 Hafez Ave., 3314 Tehran Islamic Republic of Iran

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).