Application of CFD to analyze propeller guard kit impact on hydrodynamic performance for long-tail boat propellers in Thailand
DOI:
https://doi.org/10.33175/mtr.2025.272425Keywords:
Propeller guard kits; Long-drive shaft; Inclined shaft propeller; Long-tail boats; Unsteady propeller performance; Cross-flowAbstract
The propeller guard is a device on the long-drive shaft of long-tail boats which is significant for preventing the propeller from hitting submerged metal or rocks when the boat runs aground in shallow water. There is also a tab device attached to the propeller guard, which alleviates the lifting force in the vertical axial from the propeller force when operating an inclined shaft angle while the boat is at high speed. As a result, the stern of the boat does not raise (reducing the boat's stern trim). Therefore, realistic fluid flow through a long-drive shaft and propeller guard kit is important. This affects the actual performance of the propeller. This research paper proposes the numerical evaluation of propeller performance on a full scale with a long-drive shaft and inclined propeller guard kit using the Reynolds-averaged Navier-Stokes equations (RANS) solver. The SST k-ω turbulence model is adopted to the Reynolds-stress terms in the RANS equations. The computations are performed under oblique flow conditions. The results of propeller performance, pressure distribution, and wake fields around the propeller blades and the propeller guard kit are examined. The results may be used to optimize the shape and characteristics of propeller guard kit for long-tail boats.
Highlights
- Propeller guard kits protect the propeller from hitting submerged metal or rocks when the boat runs aground in shallow water.
- Tab device is mounted on the propeller guard to reduce trim on the boat stern.
- Computational fluid dynamics (CFD) is adopted to analyze the propeller guard kits' impact on hydrodynamic performance for Long-Tail Boat propellers.
- CFD helps understand the fluid flow behavior and contributes to shape optimization for the guard + tab device.
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