Treatment of L2F anemometer measurement volume distortions created by curved windows for turbomachinery applications

Ottavy, Xavier; Trébinjac, Isabelle; Vouillarmet, André

doi:10.1088/0957-0233/9/9/021

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…7 Schematic diagram of an L2F system problem with L2F applications in turbomachinery, however, is the distortion of the focused beam pair through access windows. Ottavy et al [191] have therefore proposed an analytical method to determine the geometric characteristics required for a corrective optic. Subsequent application of the corrective optic designs were reported to have removed any signi®cant window effects when taking measurements from a ECL4 transonic compressor.…”

Section: Laser Two-focus Anemometrymentioning

confidence: 99%

The application of laser measurement techniques to aerospace flows

Lawson

2004

Proceedings of the Institution of Mechanical Engineers, Part G:

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Laser measurement techniques are becoming more commonly applied to many areas of thermo¯uids and heat transfer. An area of their application, which presents highly challenging requirements, is in the measurement of aerospace¯ows. In this case the experimentalist may encounter high mass¯owrates, high-speed¯ows and in some cases high temperatures, and the measurements may also have to be taken with restricted optical access. Such types of¯ow have already been measured using established laser techniques such as particle image velocimetry, laser Doppler anemometry, laser-induced¯uorescence and liquid crystal thermography. Other more recent techniques which have seen application include Doppler global velocimetry and molecular tagging velocimetry for velocity measurement and thermographic phosphor thermometry for surface temperature measurement. This paper reviews the most recent advances in laser techniques and their application to aerospace environments.

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Section: Laser Two-focus Anemometrymentioning

confidence: 99%

The application of laser measurement techniques to aerospace flows

Lawson

2004

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…The details of the method are given in [6]. This calculation is restricted to the configuration where the axis of the cone light is perpendicular to the windows (angles with the local vectors normal to the shroud window 4)~ and 7t8 , and the corrective window ~2c and ~c, set to zero).…”

Section: Analytical Study Of the Focus Errormentioning

confidence: 99%

L2F anemometry measurements of the inter-row flow field within a transonic axial compressor provided with curved windows

Ottavy¹,

Trébinjac²,

Vouillarmet³

1999

J. of Therm. Sci.

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L2F A n e m o m e t r y M e a s u r e m e n t s of t h e I n t e r -R o w Flow Field W i t h i n a T r a n s o n i c A x i a l C o m p r e s s o r P r o v i d e d w i t h C u r v e d W i n d o w s Xavier Ottavy Isabelle Tr@binjac Andr@ V o u i l l a r m eWhen measurements are performed in high speed, small-scale compressors, the use of curved glass windows is required in order to avoid any mismatch between the measurement window and the casing. However, the glass curvature leads to optical distortions, which hinder acceptable measurements and can even prevent the acquisition of any data. Thus, an original optical assembly, which consists in inserting a simple and inexpensive corrective window between the frontal lens of the anemometer and the shroud window, is proposed. The way of determining the geometric characteristics and the position of this corrective window, which restores very acceptable loci, is presented in the paper. The reliability of this corrective optical assembly is highlighted by comparative measurements in a test case. Using such an optical setting, L2F measurements were realised along a section, downstream of the inlet guide vane (IGV) of a transonic compressor stage. The spatial resolution leads to a good description of the interaction of the wake with the oblique shock emanating from the leading edge of the rotor. A phenomenological study of the wake/shock interaction with a change of frame is realised using the streamwise equation of the transport of vorticity.

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Flow Measurement Techniques in Turbomachinery

Uzol¹,

Katz²

2007

Springer Handbook of Experimental Fluid Mechanics

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Treatment of L2F anemometer measurement volume distortions created by curved windows for turbomachinery applications

Cited by 5 publications

References 7 publications

The application of laser measurement techniques to aerospace flows

The application of laser measurement techniques to aerospace flows

L2F anemometry measurements of the inter-row flow field within a transonic axial compressor provided with curved windows

Flow Measurement Techniques in Turbomachinery

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