Skew (hydrodynamics)
With propellers, skew is shown by a curving or rearward position of the blades against the forward direction of rotation. With skew propellers, a somewhat smaller local pitch is created at the blade tips and a slightly larger local pitch at the hub ; d. In other words, a positive hydrodynamic angle of attack correction is specified in the hub area and a negative hydrodynamic angle of attack correction at the wing tips . Skew propellers usually have a negative slope. The advantage of “skew” propellers is that they have a larger cavitation-free angle of attack . As the skew increases, the periodic pressure fluctuations on the outer skin of ships are significantly reduced.
literature
- Klaus J. Meyne: Propeller with “Skew” . In: Hansa , vol. 119, 1982, issue 18
- M. Abdel-Maksoud, F. Menter, G.Scheuerer: Numerical and experimental investigation of the viscous flow around a skew propeller . In: Yearbook of the Shipbuilding Society 1996 .
Web links
- Background knowledge of propeller geometries
- Filing from mast to keel . Focus technology