The twodimensional jet with periodic initial condition
Abstract
A twodimensional turbulent jet when subjected to periodic disturbances at the nozzle shows strong receptivity, i.e., amplification of these disturbances accompanied by an overall widening of the flow at certain locations downstream. There the structure is characterized by well defined vortices. Some of the measurements reported are done in a slightly heated jet. In addition, the flow is studied by visualization. The mixing properties of the excited jet are less than is suggested by the mean widening as obtained from long exposure smoke photographs. Therefore the integral over the intermittency distribution is suggested as a measure of the mixing width. For the locus of the maximum amplification of the excitation frequency a Strouhal number of 1.0 is found.
 Publication:

2nd Symposium on Turbulent Shear Flows
 Pub Date:
 1979
 Bibcode:
 1979stsf.proc....8F
 Keywords:

 Flow Visualization;
 Nozzle Flow;
 Shear Flow;
 Turbulent Jets;
 Two Dimensional Jets;
 Convective Flow;
 Flow Characteristics;
 Flow Distortion;
 Frequency Response;
 Vlasov Equations;
 Vortices;
 Fluid Mechanics and Heat Transfer