An investigation of LDV velocity bias correction techniques for high-speed separated flows

• Published in: Experiments in fluids Vol. 15; no. 4-5; pp. 354 - 363
• Main Authors: HERRIN, J. L, DUTTON, J. C
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01-09-1993; Berlin
• Subjects: Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Physics; Turbulence; Medium speed; Flow separation; Bias; Doppler laser anemometer; Error correction; Experimental study; Anemometry
• ISSN: 0723-4864; 1432-1114
• DOI: 10.1007/BF00223413

An experimental study of the effects of velocity bias in single realization laser Doppler velocimetry measurements in a highspeed, separated flow environment is reported. The objective of the study is to determine a post-facto correction method which reduces velocity bias after individual realization data have been obtained. Data are presented for five velocity bias correction schemes: inverse velocity magnitude weighting, interarrival time weighting, sample and hold weighting, residence time weighting, and the velocity-data rate correlation method. These data were compared to a reference measurement (saturable detector sampling scheme); the results show that the interarrival time weighting method compares favorably with the reference measurement under the present conditions. (Author)