Journal ArticleDOI
Nearfield Evolution of a Longitudinal Vortex Generated by an Inclined Jet in a Turbulent Boundary Layer
Xin Zhang,M.W. Collins +1 more
TLDR
In this article, the near-field evolution of a longitudinal vortex embedded in a turbulent boundary layer was examined in a wind-tunnel test, and the effects of the control parameters on the strength and location of the vortex were examined.Abstract:
The nearfield evolution of a longitudinal vortex embedded in a turbulent boundary layer was examined in a wind-tunnel test. The vortex was produced by an inclined round jet, the diameter of the jet being 0.4δ 0.99 . Flow properties were measured at a freestream velocity of 20 m/s using a laser Doppler anemometer. Control parameters are jet skew and pitch angles, and speed ratio. It was observed that a single vortex is generated at x = 10D. The effects of the control parameters on the strength and location of the vortex were examined. For an embedded vortex and favorable velocity distribution, the test results suggested a skew angle of 60 deg, a pitch angle of α = 30 deg, and speed ratios of γ = 1.0. The study provided insight into the flow physics and a databaseread more
Citations
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Journal ArticleDOI
An inclined rectangular jet in a turbulent boundary layer-vortex flow
TL;DR: In this article, a model test study was performed on streamwise vortices generated by a rectangular jet in an otherwise flat-plate turbulent boundary layer, and the effects of skew angle and streamwise development of vortex were investigated and the mean flow properties were presented.
Journal ArticleDOI
Development of a Steady Vortex Generator Jet in a Turbulent Boundary Layer
Gregory S. Rixon,Hamid Johari +1 more
TL;DR: In this article, the development of a vortex generator jet within a turbulent boundary layer was studied by the particle image velocimetry method, and the velocity field in planes normal to the freestream was measured at four stations downstream of the jet exit.
Journal ArticleDOI
The evolution of co-rotating vortices in a canonical boundary layer with inclined jets
TL;DR: In this paper, the evolution of co-rotating streamwise vortices in a canonical flat plate turbulent boundary layer (thickness of the boundary layer δ0.99 = 25 cm) is studied.
Journal ArticleDOI
Turbulence Measurements of a Longitudinal Vortex Generated by an Inclined Jet in a Turbulent Boundary Layer
TL;DR: In this article, a longitudinal vortex in a flat-plate turbulent boundary layer was examined in a wind tunnel experiment using laser Doppler Anemometry, which was characterized by embedded vortices, induced high turbulent kinetic energy peak, local areas of high primary shear stress, and negative shear stresses.
Journal ArticleDOI
Vortex Structure Produced by a Laterally Inclined Supersonic Jet in Transonic Crossflow
TL;DR: In this article, a supersonic jet exhausting into a transonic crossflow from a laterally inclined scarfed nozzle installed flush in a flat plate was measured at a single crossplane in the far field for varied jet-to-freestream dynamic pressure ratio J and nozzle inclination angles of 0,15,30, and 45 deg.
References
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Journal ArticleDOI
Describing the Uncertainties in Experimental Results
TL;DR: The material presented in this paper covers the method of describing the uncertainties in an engineering experiment and the necessary background material, as well as a technique for numerically executing uncertainty analyses when computerized data interpretation is involved.
Journal ArticleDOI
Vortex Generator Jets—Means for Flow Separation Control
TL;DR: In this paper, a vortex generator-jet (VGJ) method was proposed to eliminate stalled regions in turbulent boundary layers by employing spanwise arrays of small, skewed, and pitched jets from holes in the surface.
Journal ArticleDOI
Streamwise vortex production by pitched and skewed jets in a turbulent boundary layer
TL;DR: Weak longitudinal vortices produced by the interaction of simple, round wall jets with a two-dimensional flow comprising a turbulent boundary layer were studied experimentally as discussed by the authors, where the jets were pitched up at 45 degrees and skewed relative to the freestream as they entered from the wall.
Journal ArticleDOI
Discrete-jet film cooling: a comparison of computational results with experiments
J. H. Leylek,R. D. Zerkle +1 more
TL;DR: In this paper, a three-dimensional elliptic Navier-Stokes solution with high-order turbuence modeling is presented for film cooling using a new model enabling simultaneous solution offully coupled flow in plenum, film-hole, and cross-stream regions.
Journal ArticleDOI
Heat Transfer Effects of a Longitudinal Vortex Embedded in a Turbulent Boundary Layer
P. A. Eibeck,John K. Eaton +1 more
TL;DR: In this paper, the heat transfer effects of an isolated longitudinal vortex embedded in a turbulent boundary layer were examined experimentally for vortex circulations ranging from GAMMA/U/sub infinity/delta/sub 99/ = 0.12 to 0.86.