Automated two-component laser doppler anemometer for measuring turbulence parameters in a gas stratification wind tunnel

1996 ◽  
Vol 39 (6) ◽  
pp. 636-644
Author(s):  
V. I. Smirnov
Keyword(s):  
Wind Tunnel ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Two Component ◽  
Turbulence Parameters

Simple directionally sensitive two-component laser Doppler anemometer

1980 ◽  
Vol 19 (8) ◽  
pp. 1221 ◽  
Author(s):  
O. J. Deters ◽  
M. H. Friedman
Keyword(s):  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Two Component

Laser-Doppler Measurements of Velocities Just Downstream of a Collapsible Tube During Flow-Induced Oscillations

2001 ◽  
Vol 123 (5) ◽  
pp. 493-499 ◽  
Author(s):  
C. D. Bertram ◽  
G. Diaz de Tuesta ◽  
A. H. Nugent
Keyword(s):  
Cross Section ◽  
Fiber Optic ◽  
Reverse Flow ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Axial Component ◽  
Collapsible Tube ◽  
Two Component ◽  
Flow Through ◽  
The Cross

The flow field less than one diameter downstream of the end of a collapsible tube executing self-excited oscillations was examined using a two-component fiber-optic laser-Doppler anemometer. The time-averaged Reynolds number of the flow was 11,000. With the tube oscillating periodically, results obtained during many cycles of oscillation were combined to yield surface plots of the axial component over the cross section at 16 phases of the cycle. By combining measurements obtained with the laser probe in two different orientations, secondary flow vectors over the cross section were likewise constructed for 16 phases. The measurements showed strongly phasic turbulence intensity, with the phase of high intensity coinciding with the time of maximal tube collapse. Reverse flow occurred during much of the cycle, at places in the cross section that agree with our previous observations of laminar and turbulent steady flow through a rigid simulated collapsed tube.

scholarly journals Novel method for the realization of small differential pressures between 1 Pa and 1 kPa

2019 ◽  
Author(s):  
Christian Sander ◽  
Falko Harich ◽  
Martin Förderer ◽  
Eugen Sander
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Measurement Uncertainty ◽  
Pressure Difference ◽  
Total Pressure ◽  
Static Pressure ◽  
Laser Doppler Anemometer ◽  
Laser Doppler ◽  
Air Velocity ◽  
Novel Method

This paper reports a novel method for the realization of small differential pressures in the range of 1 Pa and 1 kPa by using a precision wind tunnel with Laser Doppler Anemometer (LDA) and a Prandtl tube. The LDA system measures the wind speed of the precisely controlled wind tunnel and provides traceability to SI. A Prandtl tube immersed into the wind tunnel, relates the well-controlled airflow speed to the pressure difference of total pressure and static pressure at the point of measurement. Experiments have been performed in the range between 0.5 and 60 m/s air velocity corresponding to about 150 mPa and 2.2 kPa. The measurement uncertainty of the generated differential pressures between 1 Pa and 1 kPa are calculated to be around 0.8% (k = 2).

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