Propeller-hull interaction beyond the propulsive factors-A case study on the performance of different propeller designs
Journal article, 2022

The propulsive factors are critical for scaling of model-test data, and hence important for the final power prediction. When comparing different propulsion systems based on model-scale tests, differences in propulsive factors, and hence the propeller-hull interaction, are often not well understood. In this study the propeller-hull interaction is instead described and compared using CFD for three different propulsion systems, a tip-unloaded ice-classed propeller, an ice-classed propeller with conventional radial load distribution and a non ice-classed propeller with conventional radial load distribution. To post-process the results KT/KQ is evaluated for one blade around a revolution and complemented with radial distributions of the same measure. Both tip-unloaded blades and sharp leading edges suffer in-behind due to poor performance at low load. Open water performance dependency on Reynolds number reveals that ice-classed propellers are more negatively influenced by the low Reynolds numbers of self-propulsion tests. Further, it is noted that a more even radial load distribution favours a low thrust deduction factor. Since the propulsive factors to a large extent are influenced by scale-effects and also due to that their association to the observed hydrodynamics makes the commonly applied scaling procedure of them questionable, they are not considered representative for ship-scale power prediction.

Propulsive factors


Hull-propulsion system interaction

Ice-classed propeller

Tip-unloaded propeller


Jennie Andersson

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Robert Gustafsson

Kongsberg Maritime

Rikard Johansson

Kongsberg Maritime

Rickard Bensow

Chalmers, Mechanics and Maritime Sciences (M2), Marine Technology

Ocean Engineering

0029-8018 (ISSN)

Vol. 256 111424

Analysis and optimisation of marine propulsion systems - part 2

Kongsberg Hydrodynamic Research Centre, 2019-01-01 -- 2021-06-30.

Swedish Energy Agency (38849-2), 2019-01-01 -- 2021-06-30.

Subject Categories

Applied Mechanics

Energy Engineering

Infrastructure Engineering



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