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JOURNALS // Teplofizika vysokikh temperatur // Archive

TVT, 2019 Volume 57, Issue 5, Pages 797–800 (Mi tvt11132)

This article is cited in 24 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.

UDC: 532.517:4

Received: 07.11.2018
Revised: 13.12.2018
Accepted: 25.12.2018

DOI: 10.1134/S0040364419040082


 English version:
High Temperature, 2019, 57:5, 771–774

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© Steklov Math. Inst. of RAS, 2025