2014
DOI: 10.1175/jtech-d-13-00010.1
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Two-Dimensional Rotorcraft Downwash Flow Field Measurements by Lidar-Based Wind Scanners with Agile Beam Steering

Abstract: A major risk to helicopters is the unexpected encounter of degraded visual environments in close-to-ground operations, where a loss of visibility often is caused by clouds of dust (brownout) or snow (whiteout) stirred up by intense downwash. The understanding of the phenomenon is limited, and there is a need for instruments that can measure flow fields on scales larger than a few meters with good resolution. This paper reports on the use of synchronized continuous-wave Doppler lidars for rotorcraft downwash fl… Show more

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Cited by 31 publications
(19 citation statements)
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“…Among the project deliverables, the methodology for WindScanner-based field experiments (which we report in the present paper) was developed based on the previous extensive work done under the WindScanner.dk project (see Vasiljević et al, 2016a;Sjöholm et al, 2014). The methodology was brought in to be tested and was further improved in a campaign held in Kassel (Germany) during the summer of 2014 (Pauscher et al, 2016;Vasiljević et al, 2016a).…”
Section: Perdigão-2015 Implementation Of Methodologymentioning
confidence: 99%
See 1 more Smart Citation
“…Among the project deliverables, the methodology for WindScanner-based field experiments (which we report in the present paper) was developed based on the previous extensive work done under the WindScanner.dk project (see Vasiljević et al, 2016a;Sjöholm et al, 2014). The methodology was brought in to be tested and was further improved in a campaign held in Kassel (Germany) during the summer of 2014 (Pauscher et al, 2016;Vasiljević et al, 2016a).…”
Section: Perdigão-2015 Implementation Of Methodologymentioning
confidence: 99%
“…A more detailed description of the long-range WindScanner system is provided in Vasiljević (2014b) and Vasiljević et al (2016a), while Mikkelsen et al (2011) and Sjöholm et al (2014) include additional details on the short-range WindScanner system.…”
Section: Windscanner Systemsmentioning
confidence: 99%
“…Therefore a radial wind speed may be displaced by (1.7 ms × 7 m)/(0.1 s) = 0.119 m when measuring a 7-m tall profile during 0.1 s. It is confirmed by investigating the position of the wake top during consecutive up and down sweeps that the estimate of the height uncertainty due to synchronization uncertainty is indeed conservative. A more detailed description of the WindScanner measurement technique is found in Sjöholm et al (2014).…”
Section: The Experimentsmentioning
confidence: 99%
“…Beyond the range of 50 m, independent of the lidar type, the effects of measurement volume become significant, and this limits the lidar applicability for the assessment of smallscale turbulence. Single lidars only measure the projection of the wind velocity on the laser propagation path (i.e., radial velocity), which in fact requires assumption of the horizontal homogeneity of the flow to reconstruct the wind speed (Browning and Wexler, 1968;Strauch et al, 1987). This bounds the usability of single lidars to offshore sites (Peña et al, 2008) and sites with simple topography onshore .…”
Section: Introductionmentioning
confidence: 99%