Influence of the Amplitude of the Introduced Stationary Perturbation on its Non-Modal Growth in a Laminar Flooded Jet
L. R. Gareev, O. O. Ivanov, V. V. Vedeneev, D. A. Ashurov
Institute of Mechanics of the Lomonosov Moscow State University, Moscow, Russia
Keywords: non-modal growth of disturbances, flooded jet, laminar-turbulent transition
Abstract
The influence of the amplitude of deflectors introduced into a laminar jet flow on the coefficient of linear change in the radial component of a stationary disturbance is investigated. The method for introducing disturbances and the method for measuring them are described. It is shown that a decrease in the amplitude of the deflectors does not lead to a change in the flow pattern, does not prevent the occurrence of an algebraic growth mechanism, and causes a proportional decrease in the radial component of the stationary velocity disturbance. The transition to the turbulent regime occurs after reaching a certain value of the radial expansion, which does not depend on the initial amplitude of the introduced disturbance.
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