caa a22 4500 465756670 CHVBK 20180323111849.0 cr unu---uuuuu 170327e19900701xx s 000 0 eng 10.1007/BF00418054 doi (NATIONALLICENCE)springer-10.1007/BF00418054 Time and spatial correlation measurements in the turbulent wake of a circular cylinder using Laser Doppler Anemometry [Elektronische Daten] [L. Absil, W. Steenbergen, D. Passchier] The present paper reports Laser Doppler Anemometry (LDA) measurements in the turbulent (R d =1300) wake of a circular cylinder (d=2 mm). On several typical locations in the wake, at cross-section x/d=125, temporal and lateral space velocity correlations have been measured. Temporal autocorrelation functions were determined from the randomly sampled LDA data by means of the "Slotting Technique”. The autocorrelation functions which were obtained were too low, the discrepancy giving an indication of the influence of noise in the measurements. The influence of noise generated by the photomultiplier tubes, which appeared to be the most important noise source, could be reduced by a cross-correlation technique. A partly new LDA system for two-point velocity correlation measurements was developed, consisting of an elongated measuring volume and a two-point detection system including a semireflecting mirror to divide the scattered light. The results of this investigation clearly demonstrate that LDA is a powerful tool for measuring time and spatial correlations and related properties of turbulence. Kluwer Academic Publishers, 1990 Absil L. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut Steenbergen W. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut Passchier D. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut Applied Scientific Research Kluwer Academic Publishers 47/3(1990-07-01), 247-271 0003-6994 47:3<247 1990 47 10494 https://doi.org/10.1007/BF00418054 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00418054 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Absil L. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut NATIONALLICENCE 700 1- Steenbergen W. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut NATIONALLICENCE 700 1- Passchier D. Low Speed Aerodynamics Laboratory, Department of Aerospace Engineering, Delft University of Technology, The Netherlands aut NATIONALLICENCE 773 0- Applied Scientific Research Kluwer Academic Publishers 47/3(1990-07-01), 247-271 0003-6994 47:3<247 1990 47 10494 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer