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.
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.
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