CAVITATION PERFORMANCE OF PROPELLER BLADE ROOT FILLETS

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Authors
  1. Kennedy, J.L.
  2. Walker, D.L.
  3. Doucet, J.M.
  4. Randell, T.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Propeller cavitation is a potent source of ship noise and vibrations, poses a risk of blade erosion and is normally to be avoided. The root of a propeller blade, where it joins the hub or plam, is normally fitted with a fillet of some sort. The fillet is primarily designed to reduce stress concentrations with little regard to hydrodynamic performance. At present there is little information available on the fillet's effects on propeller root cavitation. The paper presents the results of an experimental study of the effect of fillet design on blade root cavitation. In the study, twelve wing/body intersections were used to model typical blade/hub intersections on a propeller. Eight models were sufficiently large to permit testing in the Institute for Marine Dynamics' cavitation tunnel at Reynolds numbers representative of full scale. The fillets tested covered a broad range of geometry and permitted direct comparison of the effect of fillet geometry on cavitation performance. By comparing the results of tests with the two hub models, the role of the hub shape was also briefly examined. The results allow a propeller designer to qualitatively discriminate between fillets for improved root fillet cavitation performance. The consequences of this for propeller designs are briefly reviewed.
Keywords
Root fillets;Wing-body intersection
Date of publication
25 Jun 1997
Number of Pages
12
DSTKIM No
97-03425
CANDIS No
503450
Format(s):
Hardcopy;Document Image stored on Optical Disk

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