This chapter explains the principal geometric characteristics of a propeller: number of blades, diameter, pitch‐diameter ratio, and expanded area ratio, as well as rake, skew‐back, and other properties. It also discusses the hydrodynamic characteristics of a propeller, and the general impact of main propeller characteristics on performance. The overall objective of matching propeller and ship is to maximize the propulsive efficiency of the vessel. The diameter has a major impact on propeller performance. As the authors learned in the axial momentum theory of propellers, a larger diameter is usually more efficient. However, viscous losses and the wake field of the hull usually define an optimum value for the diameter which has to be found during the design process. Propellers with a skew angle of more than 25 degrees at the tip are considered high skew propellers. Assessment of propeller skew‐back strength of highly skewed blades requires detailed analysis.
Propeller Geometry
Fundamentals of Ship Hydrodynamics ; 420-434
06.05.2019
15 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch