Velocity distribution in an abruptly expanding circular duct
Abstract
The behavior of recirculating flows typical of advanced airbreathing and rocket injectors has been experimentally investigated. The configuration used consisted of a circular duct having a sudden increase of its diameter. Step size and flow velocity were chosen to be of a magnitude representative of 'suddendump' combustion chambers. The recirculation, which occurred in the separation region behind the sudden expansion, was investigated using a laserDoppler velocimeter. Detailed measurements of mean axial velocities were made. Sets of partial differential equations  including continuity, axial and transverse momentum, turbulence energy, and turbulence dissipation  were simultaneously solved using finite differencing techniques. Predictions made using these equations were brought into good agreement with the data taken from the recirculating flows under investigation by selection of appropriate 'constants' in the models.
 Publication:

ASME Journal of Fluids Engineering
 Pub Date:
 March 1977
 Bibcode:
 1977ATJFE..99..226M
 Keywords:

 Ducted Flow;
 Flow Velocity;
 Injectors;
 Recirculative Fluid Flow;
 Turbulent Flow;
 Dump Combustors;
 Finite Difference Theory;
 Flow Geometry;
 Laser Doppler Velocimeters;
 Separated Flow;
 Velocity Distribution;
 Fluid Mechanics and Heat Transfer