Laser-Two-Focus Velocimetry

This paper first reviews various publications about L2F-velocimetry with emphasis upon the important new advances of this technique. The manner of statistical data analysis of turbulent flows, including the simplified version which enables a time-saving measuring procedure, is described in some deta...

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Bibliographic Details
Main Author: Schodl,R
Format: Report
Language:English
Subjects:
ACCURACY
Component Reports
DIAMETERS
Fluid Mechanics
FOCUSING
LASER BEAMS
Laser two focus velocimetry
LASER VELOCIMETERS
Laser velocimetry
RATIOS
SEPARATION
SIGNAL PROCESSING
STATISTICAL ANALYSIS
STATISTICAL DATA
THREE DIMENSIONAL
TURBOCHARGERS
TURBULENT FLOW
WEST GERMANY
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Summary:This paper first reviews various publications about L2F-velocimetry with emphasis upon the important new advances of this technique. The manner of statistical data analysis of turbulent flows, including the simplified version which enables a time-saving measuring procedure, is described in some detail. The influence of beam diameter beam separation ratio on the measuring accuracy and on the measuring time is treated. The capability of the L2F-system at close-to-wall measurements could be further improved. Results of measurements in a very small flow channel and in a small turbocharger compressor rotor are presented. The 3-D version of the L2F-system was successfully operated recently. The principle, the optical set-up and the signal processing are described and some first results are presented. A comparison between laser doppler- and velocimeters gives answers about such signal properties as amplitude and rate, the smallest detectable particles and about the measuring time needed, based on the probe volume dimensions. This article is from 'Advanced Instrumentation for Aero Engine Components: Conference Proceedings of the Propulsion and Energetics Panel Symposium (67th) Held in Philadelphia, Pennsylvania on 19-23 May 1986,' AD-A182 954, p7-1-7-31.