A rapidly scanning laser Doppler anemometer

Chehroudi, B.

doi:10.1088/0022-3735/17/2/014

Cited by 18 publications

(6 citation statements)

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“…The correlation remains high for a longer time for the streamwise location of 396.2 cm, which is far downstream of detachment. This last result is consistent with the fact that the frequency of the energy-containing eddies decreases in a downstream direction (Chehroudi 1983).…”

Section: Discussionsupporting

confidence: 89%

“…Results from hot-wire anemometer spectra measurements (Chehroudi 1983) show that the non-dimensional parameter U,/S(nmax) is approximately constant ( x4.71) for these streamwise locations. Hence nmax is the frequency corresponding to the maximum of the plots of 10 log [nF(n)] versus frequency n at y / S x 0.5.…”

Section: Discussionmentioning

confidence: 89%

“…A TSI Model 1980 counter-type LDA signal processor is used. For more information concerning the design of this scanning LDA and signal acquisition and processing see Chehroudi & Simpson (1984) and Chehroudi (1983).…”

Section: Rapidly Scanning Laser-doppler Anemometermentioning

confidence: 99%

“…Although a DOP aerosol seeder (Simpson et al 1981a) and a polylatex-sphere solid-particle seeder (H. L. Seegmiller 1982 private communication, NASA-Ames Research Center) were tried, the following seeding method gave the best results. The solid-particle seeder built at SMU (Chehroudi 1983) is similar in design to the Opto-Elektronische Instrumente (Karlsruhe, Germany) Model 101 solid-particle seeder, which uses talcum powder having particles greater than 1 pm. The talcum powder is pushed up inside a cylinder by an aluminium piston, and is scraped by a wire wheel at the opposite end of the cylinder.…”

Section: Rapidly Scanning Laser-doppler Anemometermentioning

confidence: 99%

“…If large-scaled eddies are largely responsible for the events in the backflow region, then more detailed information such as instantaneous velocity profiles and/or correlation measurements could be used to investigate this matter. A new rapidly scanning laser-Doppler anemometer (SLDA) developed by Chehroudi & Simpson (1984) is capable of measuring mean-velocity profiles, r.m.8. velocity fluctuations and the downstream-upstream intermittency factor ypu at scanning frequencies up to The work reported here provides new information concerning the flow structures in the separated region using this scanning LDA.…”

Section: Introductionmentioning

confidence: 99%

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Space–time results for a separating turbulent boundary layer using a rapidly scanning laser anemometer

Chehroudi

1985

J. Fluid Mech.

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A rapidly scanning one-velocity-component directionally sensitive fringe-type laser-Doppler anemometer which scans the measurement volume perpendicular to the optical axis of the transmitting optics was used to investigate the flow structure of the steady freestream separated turbulent boundary layer of Simpson, Chew & Shivaprasad (1981a). Space–time correlations were obtained for the first time in a separated turbulent boundary layer and showed that the integral lengthscale Ly for the large eddies grows in size towards detachment, although the ratio of this lengthscale to the boundary-layer thickness remains constant. Results also indicate local dependence of the backflow on the middle and outer regions of the boundary layer at a given instant in time.

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Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 89%