Density changes and turbulence production in the expansion or compression of a turbulent flow at supersonic speed

1978 ◽  
pp. 385-395 ◽  
Author(s):  
J. P. Dussauge ◽  
J. Gaviglio ◽  
A. Favre
Keyword(s):  
Turbulent Flow ◽  
Supersonic Speed ◽  
Turbulence Production

Unsteady Flow Interaction Caused by Stator Secondary Vortices in a Turbine Rotor

1987 ◽  
Vol 109 (2) ◽  
pp. 251-256 ◽  
Author(s):  
A. Binder ◽  
W. Forster ◽  
K. Mach ◽  
H. Rogge
Keyword(s):  
Unsteady Flow ◽  
Turbulent Flow ◽  
Turbine Rotor ◽  
Turbulence Energy ◽  
Sudden Increase ◽  
Passage Vortex ◽  
Air Turbine ◽  
Time Distance ◽  
Turbulence Production ◽  
Secondary Vortices

Nonintrusive measurements near and within the rotor of a cold-air turbine showed a sudden increase of turbulence energy when the wake portion of the incoming fluid entered the rotor. It has been suggested that this was due to the cutting of the passage vortices and trailing-edge shed vortices which emerge from the stator row. Since these secondary vortices are located very close to the stator wakes, it was very difficult to distinguish between the effects of shed vortex and passage vortex cutting on turbulence intensification. In the present paper, a method is shown which, with the help of time–distance diagrams, made it possible to attribute the turbulence increase to the breakdown of the secondary vortices. Further, the time–distance diagrams made it possible to locate the origin of turbulence production and follow the spreading of the highly turbulent flow regions through the rotor channel.

scholarly journals Unsteady Flow Interaction Caused by Stator Secondary Vortices in a Turbine Rotor

1986 ◽  
Author(s):  
A. Binder ◽  
W. Förster ◽  
K. Mach ◽  
H. Rogge
Keyword(s):  
Unsteady Flow ◽  
Turbulent Flow ◽  
Turbine Rotor ◽  
Turbulence Energy ◽  
Sudden Increase ◽  
Passage Vortex ◽  
Air Turbine ◽  
Time Distance ◽  
Turbulence Production ◽  
Secondary Vortices

Nonintrusive measurements near and within the rotor of a cold-air turbine showed a sudden increase of turbulence energy when the wake portion of the incoming fluid entered the rotor. It has been suggested that this was due to the cutting of the passage vortices and trailing-edge shed vortices which emerge from the stator row. Since these secondary vortices are located very close to the stator wakes, it was very difficult to distinguish between the effects of shed vortex and passage vortex cutting on turbulence intensification. In the present paper, a method is shown which, with the help of time-distance diagrams, made it possible to attribute the turbulence increase to the breakdown of the secondary vortices. Further, the time-distance diagrams made it possible to locate the origin of the turbulence production and follow the spreading of the highly turbulent flow regions through the rotor channel.

Directional Surface Roughness Influence on Turbulent Flow Structure

2019 ◽  
Author(s):  
Zambri Harun ◽  
Ashraf A. Abbas ◽  
Bagus Nugroho
Keyword(s):  
Surface Roughness ◽  
Turbulent Flow ◽  
Surface Pattern ◽  
Flow Structures ◽  
Mean Velocity ◽  
Turbulent Flow Structure ◽  
Series Of Experiments ◽  
The Mean ◽  
Turbulence Production ◽  
Current Report

Abstract A series of experiments have been conducted to investigate turbulent flow structures when it is exposed to a highly directional riblet-type surfaces roughness (converging-diverging/herringbone pattern) at a relatively low Reynolds number (Reτ). These experiments show that even at a low Reτ, the surface pattern is able to modify the turbulent boundary layer. Over the diverging region, we observe a decrease in drag penalty, while over the converging region there is an increase of drag penalty, which is indicated by the shift in the mean velocity profiles. The surface roughness also influences the turbulence production, indicated by the elevated turbulence intensities profiles for both the converging and diverging regions. The result seems to deviate from early investigations that show an increase in turbulence intensities above the converging region and a lowered turbulence intensities above the diverging region. The discrepancy may be caused by the lower Reτ Ret in the current report. Other important statistics such as skewness and flatness are also reported.

Vorticity and turbulence production in pattern recognized turbulent flow structures

1977 ◽  
Vol 20 (10) ◽  
pp. S225 ◽  
Author(s):  
Helmut Eckelmann ◽  
Stavros G. Nychas ◽  
Robert S. Brodkey ◽  
James M. Wallace
Keyword(s):  
Turbulent Flow ◽  
Flow Structures ◽  
Turbulence Production

An Introduction to Turbulent Flow

2000 ◽  
Author(s):  
Jean Mathieu ◽  
Julian Scott
Keyword(s):  
Turbulent Flow

Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction

2021 ◽  
Vol 147 (3) ◽  
pp. 04020100
Author(s):  
Nasser Heydari ◽  
Panayiotis Diplas ◽  
J. Nathan Kutz ◽  
Soheil Sadeghi Eshkevari
Keyword(s):  
Turbulent Flow ◽  
Modal Analysis ◽  
Longitudinal Structure

LIMITATIONS OF THE STOCHASTIC APPROACH IN TWO-PHASE TURBULENT FLOW CALCULATIONS

1996 ◽  
Vol 6 (2) ◽  
pp. 211-225 ◽  
Author(s):  
Keh-Chin Chang ◽  
Wen-Jing Wu ◽  
Muh-Rong Wang
Keyword(s):  
Turbulent Flow ◽  
Stochastic Approach ◽  
Two Phase
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