Accession Number:

ADA038734

Title:

Propeller/Stern/Boundary-Layer Interaction on Axisymmetric Bodies: Theory and Experiment.

Descriptive Note:

Research and development rept.,

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD

Report Date:

1976-12-01

Pagination or Media Count:

84.0

Abstract:

Measurements of the boundary-layer characteristics and pressure distribution on three axisymmetric bodies with and without a propeller in operation are correlated with analytical techniques for computing 1 the interaction between the hull boundary layer flow and the potential flow and 2 the interaction between the operating propeller and the thick stern boundary layer. The agreement between the measured and computed shear stresses, pressure distributions, and velocity profiles was satisfactory except over the last 5 percent of body length on the two fullest afterbodies. An inviscid propeller-stern-boundary-layer interaaction model was developed and found to give accurate predictions of effective velocity profiles. The experimental results show that the potential-flow propeller-hull interaction methods give accurate predictions for thrust deduction and the propeller-induced pressure distribution. The present analytical techniques will be useful for predicting the full-scale effective velocity profile for propeller design when account is taken of the effects of Reynolds number, roughness, and propeller suction in modifying the nominal velocity profiles. Author

Subject Categories:

  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE