Numerical and experimental studies of 3D and unsteady turbulent body/appendage/propeller flows
Abstract
The 3D, turbulent flowfield produced by a propeller operating in the wake of a variable mesh disk has been studied with numerical solutions of the Reynoldsaveraged, NavierStokes 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 3D 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 3D boundary layer that is more prone to detachment than the 2D regions away from the appendage. Detailed measurements of the zeropressuregradient 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;
 NavierStokes 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