A propeller affects how fluid flows around the hull. It almost always increases the drag of the hull‐propulsor system beyond the bare hull resistance. These mutual effects are commonly referred to as hull‐propeller interaction. The effect of a propeller on the hull is captured in the thrust deduction fraction. Reynolds number effects are very small in the thrust deduction fraction. Therefore, the value determined in model tests is applied to the full scale ship without corrections. Thrust deduction fraction values are typically lower than the wake fraction. In ship design people often know the open water efficiency of a propeller from series data or propeller design calculations like lifting line and lifting surface computations. Prediction of the vessel performance requires the efficiency for the behind condition. Consequently, estimates for the relative rotative efficiency are necessary, which enables us to convert the measured or computed open water efficiency into the behind efficiency.
Hull–Propeller Interaction
Fundamentals of Ship Hydrodynamics ; 408-419
2019-05-06
12 pages
Article/Chapter (Book)
Electronic Resource
English
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