elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Experimental investigation of adverse pressure gradient turbulent boundary layers by means of large-scale PIV

Reuther, Nathan J. and Schanz, Daniel and Scharnowski, Sven and Hain, R. and Schröder, Andreas and Kähler, Christian (2015) Experimental investigation of adverse pressure gradient turbulent boundary layers by means of large-scale PIV. 11th International Symposium on Particle Image Velocimetry - PIV15 -, 14. - 16. Sept. 2015, Santa Barbara, CA, USA.

Full text not available from this repository.

Official URL: http://www.piv2015.org/

Abstract

With an ever increasing need for drag and in turn emission reduction, flow control concepts aiming the manipulation of turbulent boundary layers are focused more strongly. Over the last decades, attempts in finding active and passive flow control methods were examined in detail. However, investigations show that efficient turbulent boundary layer flow control concepts require a deep understanding of the dynamics within a turbulent boundary layer. Thus, this paper presents an experimental study using multiple large-scale PIV systems combined with long range micro PIV, with the purpose of shedding more light into the field of turbulent boundary layers. Therefore, a new experiment was designed to investigate turbulent boundary layers over a run length of almost 2.3 m for a wide range of Reynolds numbers and pressure gradients. Statistical averaged quantities of flows subjected to zero, favorable and adverse pressure gradient are presented. In terms of mean velocity profiles, experimental results show that the law of the wall still holds even in low Reynolds number flows subjected to adverse pressure gradients and moreover support Perry and Schofield’s hypothesis of an u ~ sqrt(y) region. A second outer layer peak was observed in streamwise turbulent intensity profiles when subjecting the flow to an adverse pressure gradient similar to the one reported for high Reynolds number ZPG turbulent boundary layers. This peak might be associated with the superstructures which are additionally characterized in this paper by means of two-point correlations.

Item URL in elib:https://elib.dlr.de/98184/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental investigation of adverse pressure gradient turbulent boundary layers by means of large-scale PIV
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reuther, Nathan J.njneetes (at) ucalgary.caUNSPECIFIED
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Scharnowski, SvenUni BW MünchenUNSPECIFIED
Hain, R.Uni BW MünchenUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.deUNSPECIFIED
Kähler, ChristianUniBw MünchenUNSPECIFIED
Date:2015
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-8
Series Name:Conference Proceedings on USB-Stick
Status:Published
Keywords:adverse pressure gradient, turbulent boundary layers, large-scale PIV, superstructures
Event Title:11th International Symposium on Particle Image Velocimetry - PIV15 -
Event Location:Santa Barbara, CA, USA
Event Type:international Conference
Event Dates:14. - 16. Sept. 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Micknaus, Ilka
Deposited On:09 Oct 2015 10:05
Last Modified:09 Oct 2015 10:05

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.