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Original scientific paper

PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE

Nasrin Javanmardi ; Dept. of Marine Technology, Amirkabir University of Technology, Tehran, Iran
Parviz Ghadimi   ORCID icon orcid.org/0000-0002-9315-5428 ; Dept. of Marine Technology, Amirkabir University of Technology, Tehran, Iran
Sasan Tavakoli   ORCID icon orcid.org/0000-0003-3155-2628 ; Dept. of Marine Technology, Amirkabir University of Technology, Tehran, Iran

Fulltext: english, pdf (1 MB) pages 151-168 downloads: 469* cite
APA 6th Edition
Javanmardi, N., Ghadimi, P. & Tavakoli, S. (2018). PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE. Brodogradnja, 69 (1), 151-168. Retrieved from https://hrcak.srce.hr/190223
MLA 8th Edition
Javanmardi, Nasrin, et al. "PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE." Brodogradnja, vol. 69, no. 1, 2018, pp. 151-168. https://hrcak.srce.hr/190223. Accessed 28 Nov. 2021.
Chicago 17th Edition
Javanmardi, Nasrin, Parviz Ghadimi and Sasan Tavakoli. "PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE." Brodogradnja 69, no. 1 (2018): 151-168. https://hrcak.srce.hr/190223
Harvard
Javanmardi, N., Ghadimi, P., and Tavakoli, S. (2018). 'PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE', Brodogradnja, 69(1), pp. 151-168. Available at: https://hrcak.srce.hr/190223 (Accessed 28 November 2021)
Vancouver
Javanmardi N, Ghadimi P, Tavakoli S. PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE. Brodogradnja [Internet]. 2018 [cited 2021 November 28];69(1):151-168. Available from: https://hrcak.srce.hr/190223
IEEE
N. Javanmardi, P. Ghadimi and S. Tavakoli, "PROBING INTO THE EFFECTS OF CAVITATION ON HYDRODYNAMIC CHARACTERISTICS OF SURFACE PIERCING PROPELLERS THROUGH NUMERICAL MODELING OF OBLIQUE WATER ENTRY OF A THIN WEDGE", Brodogradnja, vol.69, no. 1, pp. 151-168, 2018. [Online]. Available: https://hrcak.srce.hr/190223. [Accessed: 28 November 2021]

Abstracts
The current paper investigates flow around a blade section of a surface piercing hydrofoil. To this end, a thin wedge section is numerically modelled through an oblique water entry. The flow is numerically studied using a multiphase approach. The proposed numerical approach is validated in two steps. First, pressure and free surface around a wedge entering water are simulated and compared against previously published analytical results. Subsequently, cavitation phenomenon around a submerged supercavitating hydrofoil is modelled and analyzed. It is observed that cavity length, pressure, and lift force are accurately predicted. Subsequently, the main problem has been studied for two different cavitation numbers for a range of advanced ratios equivalent to fully, transition and partially ventilated conditions in order to investigate the effect of ambient pressure on hydrodynamics of the water entry of the foil. The numerical findings reveal that, when the cavitation number decreases, the start of transition mode is postponed and this mode is expanded for the larger range of velocity ratios. This implies that fully ventilated velocity ratio modes are expanded, too. However, in the transition mode, the cavitation number plays an essential role and may lead to a decrease in the pressure difference across the surface piercing hydrofoil which yields a decrease in the resultant force.

Keywords
Surface piercing propeller; oblique water entry; thin wedge; Cavitation number; Numerical modelling

Hrčak ID: 190223

URI
https://hrcak.srce.hr/190223

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