Boundary-Layer Flow on an Axisymmetric Body with an Inflected Stern.
Abstract
Static pressure distributions, mean velocity profiles, distributions of turbulence intensities, and Reynolds stresses, spatial correlation coefficients, and the Taylor microscale of turbulence were measured across the stern boundary layer of an axisymmetric body with an inflected stern. A theoretical and numerical iteration scheme, which uses the boundary layer and open wake displacement body, is found to model satisfactorily the viscid-inviscid interaction between the thick stern boundary layer and the external potential flow. The measured values of turbulence intensity, eddy viscosity, and mixing-length parameters in the stern region are found to be much smaller than those of a thin boundary layer. An approximate similarity characteristic for the thick axisymmetric stern boundary layer is obtained when the measured mixing-length parameters, the measured correlation length scales, and the measured Taylor microscales are normalized by the square root of the boundary-layer cross-sectional area instead of the local boundary layer thickness. When this simple similarity hypothesis for the mixing length and the displacement body is incorporated into the McDonnell Douglas Corp., Cebeci-Smith differential boundary-layer method, modified to consider the displacement body and wake, the theory predicts very well the measured distributions of the mean velocity throughout the entire stern boundary layer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1980
- Accession Number
- ADA088526
Entities
People
- Garnell Belt
- Nancy C. Groves
- Thomas T. Huang