Datenpaket: Riblets in fully developed turbulent channel flow

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.

Neuer Forschungsdatensatz zu finden unter https://publikationen.bibliothek.kit.edu/1000152366

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.

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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