A Separated and Reattached Flow on a Blunt Flat Plate

1976 ◽  
Vol 98 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Terukazu Ota ◽  
Masaaki Itasaka
Keyword(s):  
Flat Plate ◽  
Finite Thickness ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Reattachment Length ◽  
Reattachment Point ◽  
Separated And Reattached Flow ◽  
Velocity Pressure ◽  
Blunt Leading Edge ◽  
Made In

Velocity, pressure, and turbulence measurements were made in the separated, reattached, and redeveloped regions of a two-dimensional incompressible flow over a flat plate with finite thickness and blunt leading edge. Flow characteristics, such as the reattachment length and the flow pattern in the separated region, were determined. The boundary layer characteristics of the flow downstream of the reattachment point are presented through various experimental results.

Heat Transfer in the Separated and Reattached Flow on a Blunt Flat Plate

1974 ◽  
Vol 96 (4) ◽  
pp. 459-462 ◽  
Author(s):  
Terukazu Ota ◽  
Nobuhiko Kon
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Flat Plate ◽  
Leading Edge ◽  
Two Dimensional ◽  
Separated And Reattached Flow ◽  
The Heat Transfer Coefficient ◽  
Blunt Leading Edge ◽  
Made In

Heat transfer measurements are made in the separated, reattached, and redeveloped regions of the two-dimensional air flow on a flat plate with blunt leading edge. The flow reattachment occurs at about four plate thicknesses downstream from the leading edge and the heat transfer coefficient becomes maximum at that point and this is independent of the Reynolds number which ranged from 2720 to 17900 in this investigation. The heat transfer coefficient is found to increase sharply near the leading edge. The development of flow is shown through the measurements of the velocity and temperature in the separated, reattached, and redeveloped regions.

Turbulence Measurements in a Separated and Reattached Flow Over a Blunt Flat Plate

1978 ◽  
Vol 100 (2) ◽  
pp. 224-228 ◽  
Author(s):  
Terukazu Ota ◽  
Masashi Narita
Keyword(s):  
Kinetic Energy ◽  
Flat Plate ◽  
Turbulent Kinetic Energy ◽  
Finite Thickness ◽  
Leading Edge ◽  
Turbulent Shear ◽  
Turbulence Measurements ◽  
Turbulent Shear Stress ◽  
Separated And Reattached Flow ◽  
Blunt Leading Edge

Turbulence measurements were made in the separated, reattached, and redeveloped regions of a two-dimensional incompressible air flow over a flat plate with finite thickness and blunt leading edge. In the boundary layer downstream of the reattachment point, Prandtl’s mixing length and turbulent kinetic energy length scale are estimated, and the correlation between the turbulent shear stress and the turbulent kinetic energy is described.

An Axisymmetric Separated and Reattached Flow on a Longitudinal Blunt Circular Cylinder

1975 ◽  
Vol 42 (2) ◽  
pp. 311-315 ◽  
Author(s):  
T. Ota
Keyword(s):  
Circular Cylinder ◽  
Flow Pattern ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Experimental Results ◽  
Reattachment Length ◽  
Low Speed ◽  
Separated And Reattached Flow ◽  
Blunt Leading Edge

Low-speed experiments are made for an axisymmetric separated, reattached, and redeveloped flow over a longitudinal circular cylinder with blunt leading edge. The flow characteristics such as the reattachment length and the flow pattern in the separated region are measured. The redevelopment of the flow downstream of reattachment is also investigated through various experimental results.

Turbulent Transfer of Momentum and Heat in a Separated and Reattached Flow over a Blunt Flat Plate

1980 ◽  
Vol 102 (4) ◽  
pp. 749-754 ◽  
Author(s):  
Terukazu Ota ◽  
Nobuhiko Kon
Keyword(s):  
Heat Flux ◽  
Shear Stress ◽  
Flat Plate ◽  
Finite Thickness ◽  
Leading Edge ◽  
Turbulent Heat Flux ◽  
Turbulent Shear ◽  
Turbulent Heat ◽  
Turbulent Shear Stress ◽  
Separated And Reattached Flow

Turbulent shear stress and heat flux were measured with a hot-wire anemometer in the separated, reattached, and redeveloped regions of a two-dimensional incompressible air flow over a flat plate of finite thickness having blunt leading edge. The characteristic features of the turbulent heat flux are found to be nearly equal to those of the turbulent shear stress in the separated and reattached flow regions. However, in the turbulent boundary layer downstream from the reattachment point, the development of turbulent heat flux appears to be much quicker than that of turbulent shear stress. Eddy diffusivities of momentum and heat are evaluated and then the turbulent Prandtl number is estimated in the thermal layer downstream of reattachment. These results are compared with the available previous data.

Effect of Leading Edge Geometry on Boundary Layer Transition-An Experimental Approach

2014 ◽  
Vol 590 ◽  
pp. 53-57 ◽  
Author(s):  
Dinesh Bhatia ◽  
Guang Jun Yang ◽  
Jing Sun ◽  
Jian Wang
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Boundary Layer Thickness ◽  
Experimental Approach ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Boundary Layer Transition ◽  
Layer Transition ◽  
Edge Geometry ◽  
Displacement Thickness

Boundary layers are affected by a number of different factors. Transition of the boundary layer is very sensitive to changes in geometry, velocity and turbulence levels. An understanding of the flow characteristics over a flat plate subjected to changes in geometry, velocity and turbulence is essential to try and understand boundary layer transition. Experiments were conducted in Low Turbulence wind tunnel (LTWT) at Northwestern Polytechnical University (NWPU), China to understand the effects due to changes in geometric profiles on boundary layer transition. The leading edge of the flat plate was changed and several different configurations ranging from Aspect Ratio (AR) 1 to 12 were used. Turbulence level was kept constant at 0.02% and the velocity was kept at default value of 30 m/s. The results indicated that as the AR increases, boundary layer thickness reduces at the same location along the plate. The displacement thickness shows that the fluctuations increase with an increase with AR which denotes the effect of leading edge on turbulence spot’s production. For AR≥4, an increase in AR led to an elongation of the transition zone and a delay in transition onset. Nomenclature

scholarly journals Measurements on Fully Wetted and Ventilated Ring Wing Hydrofoils

1967 ◽  
Vol 89 (3) ◽  
pp. 445-455 ◽  
Author(s):  
A. J. Acosta ◽  
T. Kiceniuk ◽  
E. R. Bate
Keyword(s):  
Pressure Distribution ◽  
Flat Plate ◽  
Cone Angle ◽  
Leading Edge ◽  
Water Tunnel ◽  
Force Measurements ◽  
Lift Curve ◽  
Made In ◽  
Visual Observations

Force measurements and visual observations were made in a water tunnel on fully wetted and ventilated flows past a family of conical ring wings having a flat plate section geometry. The diameter chord ratio was varied from one to three, at a fixed total included cone angle of 12 deg. The fully wetted flows all exhibited separation from the leading edge except for the largest diameter-chord ratio, a result which has been attributed to excessive cone angle. The effect of ventilation is to reduce markedly the lift curve slope. Pressure distribution measurements were also made under ventilating conditions for one member of this series. The effect of ventilation over only a portion of the circumference of the ring was also briefly investigated; large cross forces were developed by such ventilation.

PLASMA FLOW CHARACTERISTICS INSIDE THE SUPERSONIC D.C. PLASMA TORCH

2005 ◽  
Vol 14 (02) ◽  
pp. 225-238 ◽  
Author(s):  
X. Q. YUAN ◽  
T. Z. ZHAO ◽  
W. K. GUO ◽  
P. XU
Keyword(s):  
Plasma Flow ◽  
Plasma Torch ◽  
Energy Transport ◽  
Flow Characteristics ◽  
Viscous Effects ◽  
Supersonic Plasma ◽  
Arc Current ◽  
Velocity Pressure ◽  
Laminar State ◽  
Made In

A magnetohydrodynamic (MHD) model, which describes supersonic plasma flow inside the torch, is presented in this paper. It is a two-dimensional model but includes the K -epsilon model of turbulence, the gas viscous effects and compressible effects. The PHOENICS software is used for solving the governing equations, i.e. the conservation equations of mass, momentum, and energy together with the equations describing the K -epsilon model of turbulence. The calculated arc voltages and gas inflow rates are consistent with the experimental results when arc current and the working gas are the same as experiment. The plasma flow characteristics inside the supersonic plasma torch are analyzed in detail. Temperature, velocity, pressure and Mach number contours are presented to show the flow characteristics. Comparisons between turbulent and laminar models are made in detail also, and the results show the turbulent enhanced momentum and energy transport inside the supersonic plasma torch has little effect on the whole discharge area. The plasma flow inside the supersonic torch is mainly in the laminar state.

scholarly journals Hypersonic boundary layer receptivity on flat plate with blunt leading edge due to acoustic disturbance

2021 ◽  
Vol 1786 (1) ◽  
pp. 012037
Author(s):  
Yifeng Zhang ◽  
Jianqiang Chen ◽  
Xianxu Yuan ◽  
Xi Chen ◽  
Xinghao Xiang
Keyword(s):  
Boundary Layer ◽  
Flat Plate ◽  
Leading Edge ◽  
Hypersonic Boundary Layer ◽  
Acoustic Disturbance ◽  
Blunt Leading Edge
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