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Studying the effect of pitch ratio on sheet cavitation in marine propellers
Mohamed Abdou1, Abdulkareem Sh. Mahdi Al-Obaidi2.
Cavitation is a phenomenon that occurs when the pressure of a fluid drops below
its saturated vapour pressure. Even though cavitation could be used in some
applications in a beneficial way, it poses serious adverse effects in the marine
propulsion field. The explosion of formed cavitation bubbles in the wake field of
the propeller puts large stresses on the propellers blade causing blade erosion in
the long term, costing the marine industry millions of dollars annually for
maintenance. It also causes vibrations and noise in ships, which for some cases
require the propulsion system designers to minimise during the propeller design
stages. Non cavitating flow and cavitating flow are studied in the research, using
a common CFD tool that uses RANS approach. The effects of altering the pitch
ratio on sheet cavitation is studied in cavitating flow using the INSEAN E779A
propeller. The study used ANSYS Fluent for the simulation and only one blade
is considered in the simulation. Periodic boundary conditions are applied for the
4-bladed propeller. The propeller is simulated in conditions set by the
Wageningen worksop and the domain size is based on the cavitation tunnel size
used in the measurements of the torque and thrust. The flow considered is
uniform and has a speed of 5.808 m/s, propeller rotational speed 36 rps, advance
coefficient 0.71, and cavitating flow at cavitation number 1.763. For the
cavitating flow, the Zwart-Gerber-Belamri cavitation model along with the k-ε
turbulence model are used. Pitch ratios of 0.8, 1.0 and 1.5 are considered and
analysed. The results show an increase of the extent of sheet cavitation on the
blade surface with an increase in pitch ratio.
Affiliation:
- Taylor's University, Malaysia
- Taylor's University, Malaysia
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Indexation |
Indexed by |
MyJurnal (2019) |
H-Index
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0 |
Immediacy Index
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0.000 |
Rank |
0 |
Indexed by |
Scopus (SCImago Journal Rankings 2016) |
Impact Factor
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- |
Rank |
Q3 (Engineering (miscellaneous)) |
Additional Information |
0.193 (SJR) |
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