Flow structure near the trailing edge of a plate

1985 ◽  
Vol 26 (3) ◽  
pp. 386-390 ◽  
Author(s):  
V. V. Bogolepov
Keyword(s):  
Flow Structure ◽  
Trailing Edge

Flow Structure and Turbulence in the Tip Region of a Turbomachine Rotor Blade

2007 ◽  
Author(s):  
Francesco Soranna ◽  
Yi-Chih Chow ◽  
Oguz Uzol ◽  
Joseph Katz
Keyword(s):  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Flow Structure ◽  
Turbulent Diffusion ◽  
Rotor Blade ◽  
Trailing Edge ◽  
Left Hand ◽  
Tip Leakage ◽  
The Subject ◽  
Turbulence Production

The flow structure and turbulence in the tip region of a rotor blade operating downstream of a row of Inlet Guide Vanes (IGVs) are investigated experimentally in a refractive index matched facility that provides unobstructed view of the entire flow field. Stereo-PIV measurements are performed in closely spaced radial planes near the blade tip in a region extending from (slightly upstream of) the blade trailing edge to about 40% of the chord downstream of it. The data enable calculations of all the components of the phase-averaged velocity and vorticity vectors, as well as the strain rate, Reynolds stress, and turbulent diffusion tensors. Each rotor blade is confined between two tip-leakage vortices, a right hand vortex (RHV), generated by the subject blade and propagating along its right hand side, and a left hand vortex (LHV), generated by the previous blade in the same row and propagating along the left hand side of the subject blade. In addition, a trailing edge vortex (TEV) lays underneath the LHV and is subject to intense shearing/deformation by the LHV. RHV-induced radial gradients of radial phase-averaged velocity cause negative turbulence production, P, along the RHV-axis, and formation of a region of low P in the gap between the RHV and the blade suction surface. Trends of turbulent kinetic energy k and P within the RHV do not agree due to the effects of advection by the phase-averaged flow. To the left of the blade, shearing of the TEV by the LHV enhances turbulence production in the region between the two vortices and the rotor wake. Trends of turbulent kinetic energy and its production rate are in good agreement and peaks of k and P occur at the same location. As the TEV migrates away from the LHV, shearing effects become weaker and the dominant contributors to production are terms containing vortex-induced radial gradients of axial and radial velocities. Turbulent diffusion is a minor contributor to the evolution of turbulent kinetic energy in the tip region. It is also shown that the tip-leakage flow/vortex deteriorates the rotor blade performance, causing a ∼66% increase in shaft power input (per unit mass flow-rate) in the tip region in comparison with midspan.

Modification of Flow Structure and Sound Source by Hybrid Porous-serrated Trailing Edge

2020 ◽  
Vol 17 (3) ◽  
pp. 539-552
Author(s):  
Hanru Liu ◽  
Nanshu Chen ◽  
Yangang Wang ◽  
Zhijie Hu
Keyword(s):  
Flow Structure ◽  
Sound Source ◽  
Trailing Edge

Effects of Trailing-Edge Attachment on the Flow Structure over a Generic Delta Wing

2017 ◽  
Vol 30 (5) ◽  
pp. 06017003
Author(s):  
C. Canpolat ◽  
S. Yayla ◽  
B. Sahin ◽  
H. Akilli
Keyword(s):  
Flow Structure ◽  
Delta Wing ◽  
Trailing Edge

Control of Flow Structure on Delta Wing with Steady Trailing-Edge Blow

AIAA Journal ◽  
2006 ◽  
Vol 44 (3) ◽  
pp. 493-501 ◽  
Author(s):  
M. M. Yavuz ◽  
D. Rockwell
Keyword(s):  
Flow Structure ◽  
Delta Wing ◽  
Trailing Edge ◽  
Control Of Flow

Vortex Flow Behind an Unsteady Airfoil in Pitching and Heaving Motions and Dynamic Thrust

2006 ◽  
Author(s):  
Masaki Fuchiwaki ◽  
Kazuhiro Tanaka
Keyword(s):  
Reynolds Number ◽  
Flow Structure ◽  
Vortex Flow ◽  
Low Reynolds Number ◽  
Vortex Street ◽  
Water Tunnel ◽  
Trailing Edge ◽  
Pitching Airfoil ◽  
Thrust Efficiency ◽  
Maximum Thrust

The detailed vortex flow structure behind a combination airfoil at a low Reynolds number region was measured by PIV. Moreover, the dynamic thrust acting on a combination airfoil was measured by a six-axes sensor in water tunnel. The combination airfoil can form clear thrust producing vortex street behind airfoil even at low non-dimensional trailing edge velocity and non-dimensional heaving velocity. Especially, it is possible to form the thrust producing vortex street with high vorticity at φ = π/2 and π. The jet velocity behind combination airfoil at φ = π/2 and π becomes over 2.0. The averaged dynamic thrust acting on a combination airfoil increases as the non-dimensional trailing edge velocity and non-dimensional heaving velocity increases, same as case in pitching and heaving airfoils. Moreover, the averaged dynamic thrust acting on combination airfoil at φ = π/2 and π is much larger than that on pitching and heaving airfoils. However, the maximum thrust efficiency of a combination airfoil at φ = π/2 was approximately 0.42 and was slightly higher than that on a pitching airfoil.

Flow Structure on Diamond and Lambda Planforms: Trailing-Edge Region

AIAA Journal ◽  
2005 ◽  
Vol 43 (7) ◽  
pp. 1490-1500 ◽  
Author(s):  
B. Yaniktepe ◽  
D. Rockwell
Keyword(s):  
Flow Structure ◽  
Edge Region ◽  
Trailing Edge
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