Velocimetry Signals and Data Reduction in Simulation and Practice

The paper first gives an overview on the state of the art of the Laser-Two-Focus (L2F)-Velocimetry. New developments of the laser velocimetry especially concerning turbomachinery applications are also discussed. The main part of the paper describes two new L2F-concepts based on optical fibers for 2D-and 3D-velocity component measurements. A multicolour 2Dsystem with selectable beam separation is presented which enables a considerable measuring time reduction particularly in flows of high turbulence intensities. A new 3D-L2F method is introduced which is based on an axial displacement between start and stop beam centers. The effect of main geometrical parameters on the system's sensitivity have been studied theoretically using two methods of modelling the measuring procedure. The theoretical results are discussed and compared with recent experimental data.

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Photon-Correlation Laser Velocimetry in Reciprocating-Engine Research

Fansler

1988

Photon Correlation Techniques and Applications

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Following a detailed review of practical aspects of photon-correlation laser-Doppler velocimetry, automotive applications are surveyed with emphasis on broad experimental and interpretive concerns common to unsteady flows and confined environments. Such situations typically permit only limited optical access and thereby place a premium on efficient operation with weak (single-photon) signals in the presence of considerable noise. Fast, robust data-acquisition and -reduction techniques that minimize user intervention are described. The survey of automotive applications concentrates on turbulent in-cylinder flow fields and combustion, but briefly includes wind-tunnel and soot-sizing measurements.

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Velocimetry Signals and Data Reduction in Simulation and Practice

Cited by 5 publications

References 25 publications

Coherent Light Scattering by Particles Moving in Two Crossed Light Beams

Coherent Light Scattering by Particles Moving in Two Crossed Light Beams

A new multicolour laser two focus velocimeter for 3-dimensional flow analysis

Photon-Correlation Laser Velocimetry in Reciprocating-Engine Research

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