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EXPERIMENTAL STUDY OF THE NON-MODAL PERTURBATION GROWTH MECHANISM IN A LAMINAR SUBMERGED JET
- Authors: Ashurov D.A.1, Vedeneev V.V.1, Gareev L.R.1, Ivanov O.O.1
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Affiliations:
- Institute of Mechanics, Lomonosov Moscow State University
- Issue: Vol 509, No 1 (2023)
- Pages: 28-38
- Section: МЕХАНИКА
- URL: https://journals.rcsi.science/2686-7400/article/view/135909
- DOI: https://doi.org/10.31857/S2686740023010029
- EDN: https://elibrary.ru/OXONJF
- ID: 135909
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Abstract
It is known that in wall-bounded flows, along with the growth of instability modes, the non-modal (algebraic) mechanism of linear growth plays an important role. In open flows, including submerged jets, the non-modal growth mechanism is theoretically studied only in the last decade; this mechanism has not yet been identified in experiments. In the present work, experiments on excitation of a non-modal “lift-up” growth mechanism are conducted. Special wavy structures (deflectors) are introduced into a laminar submerged jet of circular cross section, which excites a roller-like transverse movement. The data obtained unambiguously identify the non-modal “lift-up” growth of introduced disturbances. The development of perturbations in the experiment qualitatively corresponds to the theoretically calculated optimal perturbations. The features of the transition to turbulence caused by non-modal growth are considered.
About the authors
D. A. Ashurov
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: ashurovda@my.msu.ru
Russia, Moscow
V. V. Vedeneev
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: vasily@vedeneev.ru
Russia, Moscow
L. R. Gareev
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: gareev.lr@yandex.ru
Russia, Moscow
O. O. Ivanov
Institute of Mechanics, Lomonosov Moscow State University
Author for correspondence.
Email: ivanov@imec.msu.ru
Russia, Moscow
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