Experimental Analysis of the Unsteady Turbulent Boundary Layer Flow with Separation on Turbine Blades

Dibelius, Günther; Ahlers, E.

doi:10.1007/978-3-663-13986-7_24

Cited by 1 publication

(2 citation statements)

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“…(i) Small dimensions of LDA measuring volume; this may be achieved by design of the LDA optical system either by using a transmitting lens of short focal length or by using a slot orifices in the receiving optics (also see [4]).…”

Section: Generalization Of Lda Measurement Volume Positioning Problem...mentioning

confidence: 99%

“…In the case of near-wall measurements the LDA MV positioning may be realized either by matching of refractive index [13] or with the aid of a very thin wire for near-wall positioning [4]. Even if the LDA MV dimensions are very small, there is a finite size of the measuring volume; thus spatial integration of the LDA signals affects turbulence measurements, especially near the wall, as shown by Durst et al [7].…”

Section: Generalization Of Lda Measurement Volume Positioning Problem...mentioning

confidence: 99%

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The influence of radial positioning accuracy on LDA velocity measurements in a valve gap

Weclas¹

1996

Meas. Sci. Technol.

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In this paper, the effect of radial positioning of the measurement plane on the measured velocity profiles in a stationary valve gap under unsteady flow conditions is discussed for three velocity components. As shown, positioning of the measurement plane significantly influences all measured velocity component distributions across the valve gap, as well as the temporal velocity behaviour, particularly in the upper part of the valve gap where a high radial gradient of velocity was observed. This effect relates to the azimuthal position of the measurement point around the valve axis. A generalization of the LDA measurement control volume positioning problem and practical considerations are also discussed in the paper. In the case of high-velocity gradients in areas remote from the wall, minimization of the LDA measuring control volume dimensions is not sufficient, and several well-defined positions of the measurement plane must be chosen. This choice has to take into account the object geometry, flow conditions and the methodology.

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Section: Generalization Of Lda Measurement Volume Positioning Problem...mentioning

confidence: 99%

Section: Generalization Of Lda Measurement Volume Positioning Problem...mentioning

confidence: 99%

The influence of radial positioning accuracy on LDA velocity measurements in a valve gap

Weclas¹

1996

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Experimental Analysis of the Unsteady Turbulent Boundary Layer Flow with Separation on Turbine Blades

Cited by 1 publication

References 2 publications

The influence of radial positioning accuracy on LDA velocity measurements in a valve gap

The influence of radial positioning accuracy on LDA velocity measurements in a valve gap

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