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

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.

 Funding Agency Grant Number Russian Foundation for Basic Research 17-08-0014818-01-00210 Russian Science Foundation 19-19-00259 This work was supported by the Russian Foundation for Basic Research, project nos. 17-08-00148 and 18-01-00210 -- validation, and the Russian Science Foundation, project no. 19-19-00259 -- justification for the discovery.

Author to whom correspondence should be addressed

DOI: https://doi.org/10.1134/S0040364419040082

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

UDC: 532.517:4
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

Citation in format AMSBIB
\Bibitem{IsaGriLeo19} \by S.~A.~Isaev, M.~S.~Gritckevich, A.~I.~Leont'ev, I.~A.~Popov, A.~G.~Sudakov \paper Anomalous intensification of a turbulent separated flow in inclined, single-row, oval-trench dimples on the wall of a narrow channel \jour TVT \yr 2019 \vol 57 \issue 5 \pages 797--800 \mathnet{http://mi.mathnet.ru/tvt11132} \crossref{https://doi.org/10.1134/S0040364419040082} \elib{http://elibrary.ru/item.asp?id=39324236} \transl \jour High Temperature \yr 2019 \vol 57 \issue 5 \pages 771--774 \crossref{https://doi.org/10.1134/S0018151X19040084} \scopus{http://www.scopus.com/record/display.url?origin=inward&eid=2-s2.0-85076548500}