Numerical and experimental studies of 3-D and unsteady turbulent body/appendage/propeller flows
Abstract
The 3-D, turbulent flowfield produced by a propeller operating in the wake of a variable mesh disk has been studied with numerical solutions of the Reynolds-averaged, Navier-Stokes equations and by detailed experiments in a wind tunnel. The mesh variations of the upstream disk were chosen to produce a simulation of the wake of a streamlined, axisymmetric body with a single, streamlined appendage. Comparisons of measurements and preliminary numerical predictions show good agreement for the velocity profiles behind the propeller. The 3-D flow in the junction between a cylindrical appendage and a hull can produce separation of the trailing portion of the appendage and produces a momentum deficient 3-D boundary layer that is more prone to detachment than the 2-D regions away from the appendage. Detailed measurements of the zero-pressure-gradient boundary layer upstream of an appendage of interest have been made. A procedure has been developed for reducing blockage effects in the test wind tunnel.
- Publication:
-
Annual Report
- Pub Date:
- June 1985
- Bibcode:
- 1985vpi..rept.....S
- Keywords:
-
- Appendages;
- Boundary Layer Separation;
- Boundary Layer Transition;
- Cylindrical Bodies;
- Flow Distribution;
- Momentum;
- Navier-Stokes Equation;
- Numerical Analysis;
- Prediction Analysis Techniques;
- Pressure Gradients;
- Propellers;
- Turbulent Flow;
- Blocking;
- Disks (Shapes);
- Separated Flow;
- Simulation;
- Symmetry;
- Three Dimensional Flow;
- Turbulent Wakes;
- Unsteady Flow;
- Velocity;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer