<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Propellers may encounter oblique flow during operation in off-design conditions. Study of this issue is important from the design and ship performance points of view. On the other hand, a propeller operating in oblique flow may sometimes result in a better propulsion efficiency. The main goal of the present study is to provide an insight on the propeller characteristics in the oblique flow condition. In this research, the performance of the DTMB 4419 propeller is studied by the numerical method based on solving Reynolds Averaged Navier–Stokes (RANS) equations in several inflow angles. The sliding mesh approach is used to model the rotary motion of the propeller. Initially, the numerical method is verified by grid and time step dependency analysis at various inflow angles. Additionally, computed results at zero inflow angle are compared with the available experimental data and good agreement is achieved. Finally, the forces and moments acting on the propeller are obtained for 0° to 30° inflow angles. It is concluded that the inflow angle up to 10° has no significant influence on the thrust and torque coefficients as well as the propeller efficiency. However, at high angles up to 30°, the thrust and torque coefficients increase as the inflow angle increases, which may result in a significant improvement of propeller efficiency.</p></abstract>

Propellers may encounter oblique flow during operation in off-design conditions. Study of this issue is important from the design and ship performance points of view. On the other hand, a propeller operating in oblique flow may sometimes result in a better propulsion efficiency. The main goal of the present study is to provide an insight on the propeller characteristics in the oblique flow condition. In this research, the performance of the DTMB 4419 propeller is studied by the numerical method based on solving Reynolds Averaged Navier–Stokes (RANS) equations in several inflow angles. The sliding mesh approach is used to model the rotary motion of the propeller. Initially, the numerical method is verified by grid and time step dependency analysis at various inflow angles. Additionally, computed results at zero inflow angle are compared with the available experimental data and good agreement is achieved. Finally, the forces and moments acting on the propeller are obtained for 0° to 30° inflow angles. It is concluded that the inflow angle up to 10° has no significant influence on the thrust and torque coefficients as well as the propeller efficiency. However, at high angles up to 30°, the thrust and torque coefficients increase as the inflow angle increases, which may result in a significant improvement of propeller efficiency.

Propeller Hydrodynamic Characteristics in Oblique Flow by Unsteady Ranse Solver

Polish Maritime Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Propeller Hydrodynamic Characteristics in Oblique Flow by Unsteady Ranse Solver"}

Propellers may encounter oblique flow during operation in off-design conditions. Study of this issue is important from the design and ship performance points...

Propeller Hydrodynamic Characteristics in Oblique Flow by Unsteady Ranse Solver

Published Online: Apr 30, 2020

Page range: 6 - 17

DOI: https://doi.org/10.2478/pomr-2020-0001

Keywords
DTMB-P4119 propeller, URANS equation, oblique flow, sliding mesh technique

© 2020 Hossein Nouroozi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Propeller Hydrodynamic Characteristics in Oblique Flow by Unsteady Ranse Solver

Published Online: Apr 30, 2020

Page range: 6 - 17

DOI: https://doi.org/10.2478/pomr-2020-0001

KeywordsDTMB-P4119 propeller, URANS equation, oblique flow, sliding mesh technique

© 2020 Hossein Nouroozi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
DTMB-P4119 propeller, URANS equation, oblique flow, sliding mesh technique