ROLLA™ Propellers

SURFACE PIERCING PROPELLERS


SUBMERGED PROPELLERS


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UNRIVALED PERFORMANCE

SUBMERGED PROPELLERS

Operating below the waterline, fully submerged propellers are commonly used in vessels that require stability across different speeds as well as reliable, consistent thrust.

Process

Our fully submerged propellers undergo a meticulous design process leveraging cutting-edge software and expertise. Utilizing Rolla’s proprietary software, which is based on the panel method, we analyze various inputs such as diameter, number of blades, skew, and rake to determine the optimal design for each application. This software allows for comprehensive 3D study and optimization of the propeller geometry. Following this, our team employs Computational Fluid Dynamics (CFD) analysis to further refine the propeller load and identify any potential cavitation or flow issues. By simulating the velocity field and utilizing advanced CFD methods, we ensure the propeller is finely tuned to deliver optimal performance. 

 

Specifications

Fully submerged propellers are manufactured in NiBrAl up to 3.5 meters diameter with a power range from 500 Hp up to 5000 Hp. 

CFD Analysis

To achieve superior performance and reliability, our submerged propellers undergo rigorous CFD analysis using internally developed programs based on the panel method. Each propeller design is meticulously examined, with modifications made iteratively until the optimal shape is achieved. While the panel method provides fast and accurate results for most conventional propellers, our commitment to excellence drives us to validate each design using CFD codes. This additional step allows us to fine-tune the propeller load, addressing thrust, torque, and local flow phenomena, such as those occurring at the blade-hub junction. Furthermore, recognizing the significance of cavitation in marine propellers, we actively contribute to research efforts through our membership in the Consortium on Cavitation. Leveraging our expertise, we have developed advanced CFD methods capable of solving complex fluid dynamics equations in both 2D and 3D conditions, including non-stationary cavitation scenarios. This ensures our propellers not only meet but exceed performance expectations, delivering unparalleled reliability and efficiency.

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