An Experimental Study Of Unsteady Vortex / Turbulent Boundary Layer Interactions
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Date
2011-09
Authors
Haji Serakawi, Abdul Rashid
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The main aim of the present study is to investigate the performance of an oscillating
sub boundary layer vortex generator (SBVG) through experimental approach. The
current research work will focus on the interaction between turbulent boundary layer
and SBVG. The vortex generator height, ℎ is approximately equal to 20% of the
boundary layer thickness, . The work is divided into two parts i.e. steady (passive)
SBVG and oscillating (active) SBVG. The steady vortex was created by the static
SBVG with angle of incidence, of 18° with different vortex generator chord
length, height, and spacing between vortex generators. In order to create unsteady
vortex, the SBVG was oscillated at a number of frequencies. The oscillating SBVG
was oscillated between range of −18° and 18° angle of incidence. This motion was
executed at reduced frequencies, of 0.03, 0.08 and 0.16. The static SBVGs show
that the AR plays an important role for TBL thinning and flow separation recovery.
The lowest reduced frequency of the oscillating SBVGs show a good development of
unsteady vortices. In addition, the oscillating SBVG employment is proven to be
effective in removing the flow separation.
Description
Keywords
An experimental study of unsteady vortex , turbulent boundary layer interactions