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This article is cited in 20 scientific papers (total in 20 papers)
Short Communications
Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel
S. A. Isaevab, M. S. Gritckevichb, A. I. Leont'evc, I. A. Popova, A. G. Sudakovb a Kazan National Research Technical University named after A. N. Tupolev
b Saint-Petersburg State University of Civil Aviation
c Bauman Moscow State Technical University
Abstract:
In a long, plane-parallel channel with single-row, inclined, oval-trench dimples on the wall, a periodic section with a relative length of $8$ (the distance between centers of neighboring dimples), a width of $9$, a height of $1$, and a centrally located, inclined, oval-trench dimple with a length of $7.05$, a width of $1.05$, a depth of $0.25$, and with variation in the inclination angle from $1^{\circ}$ to $89^{\circ}$ is considered. An anomalous intensification of a separated turbulent air flow in an inclined dimple at the Reynolds number of $10^4$ is discovered. At an inclination angle of $60^{\circ}$, the maximum absolute value of negative friction in the middle longitudinal cross-section exceeds the friction in a plane-parallel channel by more than $2.5$ times. The cause of this phenomenon is related to the formation of a high pressure drop between the closely located zones of stagnation and low pressure in the semispherical inlet segment of the dimple.
Received: 07.11.2018 Revised: 13.12.2018 Accepted: 25.12.2018
Citation:
S. A. Isaev, M. S. Gritckevich, A. I. Leont'ev, I. A. Popov, A. G. Sudakov, “Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel”, TVT, 57:5 (2019), 797–800; High Temperature, 57:5 (2019), 771–774
Linking options:
https://www.mathnet.ru/eng/tvt11132 https://www.mathnet.ru/eng/tvt/v57/i5/p797
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