Experimental investigations of the vortex flow on delta wings at high incidence

AIAA Journal ◽  
1992 ◽  
Vol 30 (4) ◽  
pp. 1027-1032 ◽  
Author(s):  
W. H. Stahl ◽  
M. Mahmood ◽  
A. Asghar
Keyword(s):  
Vortex Flow ◽  
Experimental Investigations ◽  
Delta Wings ◽  
High Incidence

scholarly journals Application of Deswirl Device in Cyclone Dust Separator

2017 ◽  
Vol 20 (3&4) ◽  
pp. 203-216 ◽  
Author(s):  
M. Z. Abdullah ◽  
Z. Husain ◽  
S. M. Fraser
Keyword(s):  
Vortex Flow ◽  
Flow Instability ◽  
Laser Doppler Anemometry ◽  
Experimental Investigations ◽  
Reduced Pressure ◽  
Constant Flow Rate ◽  
Visualization Experiment ◽  
Vortex Finder ◽  
Dust Separator ◽  
Main Components

The experimental investigations of the vortex flow inside the vortex finder (outlet duct) of the cyclone dust separator have been carried out.  Preliminary study from the visualization experiment has been performed and discovered vortex instability inside the conventional vortex finder.  In order to minimize the instabilities, the streamlined entry shape was inserted at the vortex finder entrance and the results showed remarkable improvement of the vortex flow instability inside the vortex finder.  The velocity measurements of two main components of velocity were performed using a laser-Doppler anemometry at the cyclone vortex finder outlet.  The experiments were conducted at a constant flow rate of 0.0246m3/s with the vortex finder diameter of 64mm and with several types of entrance configuration in order to improve the cyclone performance and to reduce the losses.  The use of deswirl devices inside the vortex finder significantly reduced pressure drop and energy losses.

Non-planar aerodynamics of delta wings at high incidence

2001 ◽  
Author(s):  
T. Lui ◽  
X. Huang ◽  
E. Hanff
Keyword(s):  
Delta Wings ◽  
High Incidence

Passive Wingtip Vortex Control by Using Tip-Mounted Half Delta Wings in Ground Effect

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Anan Lu ◽  
Tim Lee
Keyword(s):  
Vortex Flow ◽  
Ground Effect ◽  
Tip Vortex ◽  
Secondary Vortex ◽  
Flow Properties ◽  
Delta Wings ◽  
Vortex Control ◽  
Physical Mechanisms ◽  
Induced Drag ◽  
Wingtip Vortex

Abstract The ground effect on the wingtip vortex generated by a rectangular semiwing equipped with tip-mounted regular and reverse half delta wings was investigated experimentally. The passive tip vortex control always led to a reduced lift-induced drag as the ground was approached. In close ground proximity, the presence of the corotating ground vortex (GV) added vorticity to the tip vortex while the counter-rotating secondary vortex (SV) negated its vorticity level. The interaction of the GV and SV with the tip vortex and their impact on the lift-induced drag were discussed. Physical mechanisms responsible for the change in the vortex flow properties in ground effect were also provided.

Vortex flow over delta and double-delta wings

1983 ◽  
Vol 20 (9) ◽  
pp. 825-832 ◽  
Author(s):  
H. W. M. Hoeijmakers ◽  
W. Vaatstra ◽  
N. G. Verhaagen
Keyword(s):  
Vortex Flow ◽  
Delta Wings

On the vortex flow over delta and double-delta wings

1982 ◽  
Author(s):  
H. HOEIJMAKERS ◽  
W. VAATSTRA ◽  
N. VERHAAGEN
Keyword(s):  
Vortex Flow ◽  
Delta Wings

Experimental Investigations of the Surface Groove Effect in Taylor-Couette-Poiseuille Flow

2020 ◽  
Author(s):  
Lamia Gaied ◽  
Fethi Aloui ◽  
Marc Lippert ◽  
Emna Berrich
Keyword(s):  
Couette Flow ◽  
Vortex Flow ◽  
Axial Flow ◽  
Vortex Structures ◽  
Base Flow ◽  
Taylor Vortex ◽  
Experimental Investigations ◽  
Surface Groove ◽  
Taylor Couette ◽  
The Impact

Abstract In this paper, we investigate the effects of an imposed axial flow on hydrodynamic instabilities’ Couette-Taylor flow in the case where the wall of the inner cylinder of the system is grouved. Without imposed axial flow, the basic flow of a fluid between two coaxial cylinders known by Couette flow, which is characterized by several temporal and spatial symmetries. The increase in the rotation causes the breaking of these symmetries. In both cases where the surface of the inner cylinder is smooth and grooved, five different flow regimes can be determined: Taylor vortex flow (TVF), wavy vortex flow (WVF), and Modulated Wavy vortex flow (MWVF). Each time the flow passes from one hydrodynamic regime to another until it enters a state of turbulence, which is characterized by the destruction of all the symmetries that existed at the beginning. In addition, when an axial flow is imposed on a Taylor-Couette flow, new helical vortex structures are observed in both cases (with and without surface groove). The influence of surface structures (grooves) on the shear stress of the wall is discussed with and without axial base flow. A spatio-temporal description of several flow models was obtained using firstly, a visualization’s qualitative study using kalliroscope particles. Secondly, a quantitative study by polarography using simple probes have been used to characterize the impact of vortex structures on the Couette-Taylor flows without and with an axial flow on the transfer.

Experimental study of vortex flow control on double-delta wings using fillets

1996 ◽  
Vol 33 (4) ◽  
pp. 743-751 ◽  
Author(s):  
Sheshagiri K. Hebbar ◽  
Max F. Platzer ◽  
Abdullah M. Alkhozam
Keyword(s):  
Experimental Study ◽  
Flow Control ◽  
Vortex Flow ◽  
Delta Wings
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