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Riblets in fully developed turbulent channel flow

Deyn, Lars Hendrik von; Gatti, Davide; Frohnapfel, Bettina

Abstract:
This database features high-precision pressure measurements in a wind tunnel facility used to determine the skin friction drag reduction of ribelts. Please refer to the README below for further information.

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Zugehörige Institution(en) am KIT Institut für Strömungsmechanik (ISTM)
Publikationstyp Forschungsdaten/Bilder
Jahr 2019
Erstellungszeitraum 22.01.2019
Identifikator DOI (KIT): 10.5445/IR/1000089978
KITopen-ID: 1000089978
Lizenz CC BY-NC-ND 4.0: Creative Commons Namensnennung – Nicht kommerziell – Keine Bearbeitungen 4.0 International
Liesmich

RIBLETS IN FULLY DEVELOPED TURBULENT CHANNEL FLOW

This database features high-precision pressure drop and flow rate measurements in an air channel flow facility with aspect ratio 1:12 which were taken to determine the skin friction drag reduction of riblets. In this facility the channel flow is fully turbulent for bulk Reynolds numbers above 5000. The dataset includes values for the smooth wall reference case and three geometrically different sets of riblets. Multiple flow rate measurement devices are used (see table1), namely an inlet nozzle and an orifice flow meter. The measurements were taken by Andreas Güttler, Lars von Deyn and Luigi Coppini.

table1:

type index diameter range in Reb
orifice 1 60[mm] 3000<Reb<13000
orifice 2 105[mm] 7000<Reb<38000
orifice 3 150[mm] 30000<Reb<89000
inlet nozzle 4 60[mm] 6000<Reb<24000

References:

A. Güttler. High accuracy determination of skin friction differences in an air
channel flow based on pressure drop measurements. PhD thesis, Karlsruhe Institute
of Technology, 2015.

DIN EN ISO 5167:Measurement of fluid flow by means of pressure differential devices
inserted in circular cross-section conduits running full, 2004.


Content:

  • reference results of smooth turbulent channel flow measured in the range of 5000<Reb<89000.

  • three geometrically different sets of ribelts measured in the range of 5000<Reb<89000.

      _____s_____
     /\         /\   |
    /  \       /  \  |h
___/    \_____/    \_|___

table2:

s[mu] h[mu] tip angle Reb_opt
set1 614 294 53.5 11400
set2 170 160 50 50000
set3 86 83 51 97000

lars.deyn@kit.edu

davide.gatti@kit.edu

bettina.frohnapfel@kit.edu

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