Mean velocity and concentration characteristics downstream of rows of jets in a crossflow
Abstract
The flow characteristics of rows of jets in a cross flow are studied experimentally for the range of velocity ratios from 0.5 to 2.8. It is found that the mean velocity and concentration profiles downstream of a row of jets issuing normal to a crossflow, with a uniform pitchtodiameter ratio and velocity ratios from 0.5 to 2.8, are symmetrical and stable. For high jettocrossflow velocity ratios (2.8 and 2), the introduction of a geometric asymmetry leads to a highly eccentric velocity field, but the passive scalar field tends to return to symmetry with downstream distance. With lower velocity ratios (1.0 and 0.5), the asymmetry of the velocity field becomes less pronounced, and the passive scalar field is no longer able to return to symmetry. There is no interaction between opposing jets separated by eight jet diameters. This information is relevant to the lower range of velocity ratios found in gas turbines.
 Publication:

ASME Journal of Heat Transfer
 Pub Date:
 May 1980
 Bibcode:
 1980ATJHT.102..391K
 Keywords:

 Cross Flow;
 Flow Velocity;
 Jet Flow;
 Wind Tunnel Tests;
 Concentration (Composition);
 Flow Geometry;
 Pipe Flow;
 Symmetry;
 Fluid Mechanics and Heat Transfer