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Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN:
1-56700-135-1 (Print)

JET CONTROL BY COUNTERFLOW

Michel Favre-Marinet
Laboratoire des Ecoulements Geophysiques et Industriels Institut de Mecanique de Grenoble INPG, UJF, CNRS, BP. 53X, 38041 Grenoble, France

Andrzej Boguslawski
Institute of Thermal Machinery, Technical University of Czestochowa, Poland

Abstract

The expansion of axisymmetric jets and their initial turbulence level are considerably enhanced by using a suction collar of sufficient length around the nozzle and by producing a counterflow near the jet exit. Visualizations and velocity-fluctuations spectra show that the near-field of the jet is the seat of low-frequency large-size ejections. The observed phenomena seem to be due to a large positive pressure gradient and to recirculation generated by the suction in the collar chamber.