Flow studies in impeller passages
Abstract
The formulation of a computational code is described and the design of a novel laser Doppler anemometer for studying the boundary layers in high speed impeller passages. Detailed derivation of boundary layer equations in a nonorthogonal rotating coordinate system are presented. The code employs the momemtum integral equations in the streamwise (x) and crossflow (z) directions, a modified Head's entrainment, and the Ludwig Tillmans empirical frictionship. The Spence velocity profile is used for the streamwise direction and the form of the cross flow velocity profile is obtained from a simple theoretical consideration. Using the integral approach, the boundary layer solutions are obtained by viscous/inviscid interations. A quasi three dimensional code is used to obtain the inviscid solution. The shape parameter is employed to indicate flow separation and a modified lagentrainment method is used to calculate boundary layers beyond separation. Corner and tip leakage effects are also incorporated using very simple models.
 Publication:

Ph.D. Thesis
 Pub Date:
 1988
 Bibcode:
 1988PhDT........23A
 Keywords:

 Boundary Layer Equations;
 Boundary Layer Separation;
 Boundary Layers;
 Computer Programs;
 High Speed;
 Impellers;
 Inviscid Flow;
 Separated Flow;
 Velocity Distribution;
 Anemometers;
 Corners;
 Cross Flow;
 Entrainment;
 Flow Velocity;
 Integral Equations;
 Laser Applications;
 Leakage;
 Rotation;
 Fluid Mechanics and Heat Transfer