Effective Wake: Theory and Experiment.
Abstract
An improved theoretical method is presented for computing the effective wake of propulsors operating in thick stern boundary layers on axisymmetric bodies. The hydrodynamic interaction between the nominal velocities upstream of the propulsor and at the propulsor location is assumed to be inviscid in nature and the total energy is assumed to be conserved along a given streamline with and without the propulsor in operation. Theoretical predictions using the method are compared with experimental data obtained in the United States and Japan for five different propulsor/axisymmetric body configurations. For all five cases examined, the computed total velocity profiles immediately upstream of the propulsor (with the propulsor in operation) are in good agreement with the measured values. In addition, the volume-mean values of effective velocity profiles computed from the measured nominal velocity profiles are in good agreement with the measured values of the Taylor wake fraction (1-wT) for all five nominal wake distributions over a wide range of propulsor thrust loading coefficients. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1981
- Accession Number
- ADA097773
Entities
People
- Nancy C. Groves
- Thomas T. Huang