Effect of tip rake angle on the hydrodynamic characteristics and sound pressure level around the marine propeller

ABSTRACT

This paper presents the effect of the tip rake angle on the hydrodynamic characteristics and sound pressure level (SPL) around the ship propeller by Reynolds-Averaged Navier–Stokes solver. Tip rake angle may cause changes in tip vortex and hydrodynamic performance and noise level. The two-step Fflowcs Williams and Hawkings (FW-H) equations are used to calculate the pressure distribution, hydrodynamic characteristics as well as SPL at various points around the propeller. The DTMB4382 propeller is selected. The effects of the tip rake angle on the hydrodynamic and SPL around the propeller are investigated. Various numerical results such as SPL at different downstream points and different topside points of the propeller and hydrodynamic characteristics are presented and discussed. Main conclusion is found that when the positive or negative rake is increased the efficiency is slightly decreased and the SPL is also diminished.

KEYWORDS:

• DTMB4382
• tip rake angle
• hydrodynamic characteristics
• sound pressure level

Acknowledgments

The numerical computations presented in this paper have been performed on the parallel machines of the High Performance Computing Research Center (HPCRC) at Amirkabir University of Technology (AUT). Their support is gratefully acknowledged.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors received no financial support for the research, authorship and/or publication of this article.

Notes on contributors

Hassan Ghassemi

Hassan Ghassemi is currently working as Professor in Department of Maritime Engineering, Amirkabir University of Technology. His research areas include ship resistance and propulsion, high speed craft, hydrofoil and propeller theory, boundary element method (BEM) and computational fluid dynamics (CFD).

Mohsen Gorji

Mohsen Gorji is currently pursuing PhD degree in Department of Marine Engineering, Malek-Ashtar University of Technology. His research areas include propeller noise, underwater vehicles and numerical methods.

Jalal Mohammadi

Jalal Mohammadi is currently working as Assistant Professor in Department of Marine Engineering, Malek-Ashtar University of Technology. His research areas include aerodynamics, internal and external ballistics, computational fluid dynamics (CFD).