Journal ArticleDOI
An inclined rectangular jet in a turbulent boundary layer-vortex flow
Reads0
Chats0
TLDR
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.Abstract:
A model test study was performed on streamwise vortices generated by a rectangular jet in an otherwise flat-plate turbulent boundary layer The study was conducted in a low speed wind tunnel The rectangular jet had a cross-section size of 28 mm by 55 mm The oncoming boundary layer had a 995 percent thickness of 25 mm The freestream speed of the oncoming flow was 20 m/s Measurements were performed with a three-element LDA system The effects of skew angle and streamwise development of vortex were investigated and the mean flow properties are presented The study showed that the rectangular jet was able to produce a streamwise vortex of higher strength than that of a round jet, while at the same time keeping the same size and shape as that of a round jet A 63% increase in the maximum vorticity was found The 45∘ skew angle was identified as the optimal skew angle for vortex productionread more
Citations
More filters
Journal ArticleDOI
Aerodynamics of a Single Element Wing in Ground Effect
Jonathan Zerihan,Xin Zhang +1 more
TL;DR: In this article, the effect of ground proximity and flap setting has been quantified in terms of aerodynamic performance and off-surface flowfield characteristics of a cambered, double-element, high-lift wing operating in ground effect.
Journal ArticleDOI
Control of a decelerating boundary layer. Part 3: Optimization of round jets vortex generators
Gilles Godard,Michel Stanislas +1 more
TL;DR: Godard et al. as mentioned in this paper compared three different types of vortex generators: passive devices, slotted and round jets, and showed that the optimized jet devices give performances comparable to standard passive vortex generators in terms of skin friction.
Journal ArticleDOI
Vortical structures over rectangular cavities at low speed
Graham Ashcroft,Xin Zhang +1 more
TL;DR: In this article, the authors focus on the time-mean and instantaneous development of the turbulent flow structures in the cavity shear layer and investigate the effects of geometry (length-to-depth ratio) and flow speed on these structures.
Journal ArticleDOI
Dielectric-barrier-discharge vortex generators: characterisation and optimisation for flow separation control
Timothy Jukes,Kwing-So Choi +1 more
TL;DR: In this paper, the authors investigated the use of dielectric-barrier-discharge plasma actuators as vortex generators for flow separation control applications, and they found that the vortex generators were successful in reducing the separation region, even at plasma-to-free-stream velocity ratios of less than 10%.
Journal ArticleDOI
Aerodynamics of a double element wing in ground effect
Xin Zhang,Jonathan Zerihan +1 more
TL;DR: In this paper, the effect of ground proximity and flap setting was quantified in terms of aerodynamic performance and off-surface flowfield characteristics of a cambered double-element, high-lift wing operating in ground effect.
References
More filters
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
Control of low-speed turbulent separated flow using jet vortex generators
TL;DR: In this paper, a parametric study has been performed with jet vortex generators to determine their effectiveness in controlling flow separation associated with low-speed turbulent flow over a two-dimensional rearward-facing ramp.
Journal ArticleDOI
Longitudinal vortex control: techniques and applications
TL;DR: In this paper, the authors present vortex control applications and extant techniques for the control of longitudinal vortices produced by bodies, leading edges, tips, and intersections, as well as their interaction with shock waves and surfaces.
Journal ArticleDOI
Measurements of a longitudinal vortex generated by a rectangular jet in a turbulent boundary layer
Xin Zhang,M.W. Collins +1 more
TL;DR: In this article, the mean flow field created by the interaction between a two-dimensional flat plate turbulent boundary layer on a flat plate and an inclined jet was measured with a three-component laser Doppler anemometer system in a low speed wind tunnel.