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Acoustic excitation of isothermal and heated air jets

Bogusławski A., Żabierek D.

Turbulence : international journal

2002

Vol. 8-9

175-188

The paper presents some preliminary studies of the homogeneous and non-isothermal jet response to external acoustic forcing. The experiment shows a complexity of the flow phenomena under sound excitation. It reveals that the natural flow instabilities can be amplified by external forcing but also that flow oscillations can be entirely driven by external forcing provided that high enough forcing level is applied. An interesting shift of the jet response frequency for isothermal jet caused by external forcing was noted. Some visualisation studies of the homogeneous jet strongly forced in order to generate "side jets" were briefly discussed.

Structure of the velocity field in a jet dominated by absolute instability

Frania T., Bogusławski A.

Turbulence : international journal

2000

Vol. 6-7

187-198

The paper is devoted to the problem of the absolute instability. An axi-symmetric hot air jet discharging into cold ambient air was investigated experimentally using the Laser Doppler Anemometer.

Contemporary state of research in the field of absolute instability performed in Institute of Thermal Machinery

Bogusławski A., Drobniak S.

Turbulence : international journal

1998

Vol. 4

55-66

The paper presents a brief introduction to the problem of absolute instability both from theoretical and experimental point of view. Then the experimental set-up prepared at the Institute of Thermal Machinery to study hot air jet stability is described together with a preliminary program of the experimental work concerning important questions formulated on the basis of the previous experimental investigations.