Aerodynamic investigation of a rotating ribroughened channel by means of time-resolved piv

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Particle image velocimetry (PIV) is used to study the turbulent flow over the ribroughened wall of a cooling channel model in rotation. The aspect ratio is 0.9, the blockage ratio is 0.1 and the rib pitch-to-height ratio is 10. The flow direction is outward, with a Reynolds number of 1.5.104 and a rotation number of 0.3 in both rotational direction. The PIV system rotates with the channel, allowing to measure directly the relative flow velocity with high spatial and temporal resolution. Coriolis forces affect the stability of the shear layers: clockwise (counter-clockwise) rotation inhibits (enhances) the turbulent motion, influencing velocity, vorticity and turbulence intensity of the flow. The time-resolved measurements show the effect of rotation on the shear layer instability and on the consequent formation of spanwise vortices, as well as on the time trace of the reattachment point. Turbulent energy spectra suggest that all temporal scales are affected by rotation.

Original languageEnglish (US)
Title of host publication9th European Conference on Turbomachinery
Subtitle of host publicationFluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
EditorsM. Sen, M. Manna, T. Arts, G. Bois
PublisherIstanbul Technical University
Pages411-421
Number of pages11
ISBN (Electronic)9789755613901
StatePublished - Jan 1 2011
Externally publishedYes
Event9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Istanbul, Turkey
Duration: Mar 21 2011Mar 25 2011

Publication series

Name9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011 - Conference Proceedings
Volume1
ISSN (Print)2410-4833

Other

Other9th European Conference on Turbomachinery: Fluid Dynamics and Thermodynamics, ETC 2011
CountryTurkey
CityIstanbul
Period3/21/113/25/11

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