PROPELLER CAVITATION AND CAVITATION-INDUCED PRESSURE FLUCTUATION: CORRELATION BETWEEN THEORY AND EXPERIMENTS
Cavitation extents and cavitation-induced fluctuating pressures on an adjacent body are computed and compared with experimental results for propellers operating in a nonuniform flow. Three five-bladed propellers with varying degrees of skew are selected for calculations. An unsteady lifting-surface theory based on a discrete vortex/source lattice method was used for the prediction. The effects of skew, leading edge nonlinearity, blade loading and thickness on the cavitation and cavitation-induced pressures were investigated. Unsteady pressures on a flat plate above the rotating propellers were computed from the field point potential. Without the nonlinear leading edge correction, cavitation extents and cavitation-induced pressures were somewhat overpredicted compared with the experimental measurements. When the leading edge correction was included in the computations, cavitation extents and the fluctuating pressures were underpredicted. Predicted blade-frequency pressured induced by non-cavitating propellers showed better agreement with measured values than cavitating propellers. Predictions of the fluctuating pressure induced by cavitating propellers without the leading edge correction were in better agreement with measured values than those with the leading edge correction. Cavity length, volume, and induced pressure were reduced with increasing skew.
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Supplemental Notes:
- Soc. N.A.M.E., Propellers '88 Symposium, held Virginia Beach, Va, 20-21 Sept. 1988, Paper No. 10 [11 pp., 17 ref., 3 tab., 12 fig.]
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Authors:
- Kim, K H
- Nguyen, P N
- Publication Date: 1988
Language
- English
Subject/Index Terms
- TRT Terms: Cavitation (Mechanics); Cavitation erosion; Propellers
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 00694272
- Record Type: Publication
- Source Agency: British Maritime Technology
- Files: TRIS
- Created Date: Aug 14 1995 12:00AM