Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering

Mikael Sjöholm, Nikolas Angelou, Per Hansen, Kasper Hjorth Hansen, Torben Mikkelsen, Steinar Haga, Jon Arne Silgjerd, Neil Starsmore

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

390 Downloads (Pure)

Abstract

A ground-based remote sensing short-range WindScanner with agile beam steering based on a modified ZephIR continuous-wave wind lidar (LIght Detection And Ranging) and a double prism
arrangement has recently been developed at the Department of Wind Energy at the DTU Risø campus. The WindScanner measures the line-of-sight component of the wind and by rapid steering of the
line-of-sight and the focus position, all locations within a cone with a full top angle of 120 can be reached from about 8 meters out to some hundred meters depending on the range resolution needed.
By using three such WindScanners, all three components of the wind can be retrieved. Here, the first mean 2D turbulent wind fields measured in a horizontal and a vertical plane below a hovering search and rescue helicopter are presented. The line-of-sights of two synchronized WindScanners were scanned within the plane of interest. Since both line-of-sights always were inside the plane scanned, the influence of the wind component perpendicular to the plane was avoided. The results indicate that the flow field below a helicopter can be characterized remotely, which can support helicopter optimization regarding, for example, minimizing the risk to aircraft and personnel when operating in a search and rescue role. The results from the application of the short-range WindScanner technology to the complex and turbulent helicopter downwash demonstrates the possibilities also within less demanding flows encountered within complex terrain and wind energy related research for which the WindScanner technology primarily has been developed.
Original languageEnglish
Title of host publicationExtended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing
PublisherSteering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing
Publication date2012
Pages267-270
Publication statusPublished - 2012
Event16th International Symposium for the Advancement of Boundary-Layer Remote Sensing - Boulder, United States
Duration: 5 Jun 20128 Jun 2012
Conference number: 16
https://www.esrl.noaa.gov/psd/events/2012/isars/

Conference

Conference16th International Symposium for the Advancement of Boundary-Layer Remote Sensing
Number16
CountryUnited States
CityBoulder
Period05/06/201208/06/2012
Internet address

Cite this

Sjöholm, M., Angelou, N., Hansen, P., Hansen, K. H., Mikkelsen, T., Haga, S., ... Starsmore, N. (2012). Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering. In Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing (pp. 267-270). Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing.
Sjöholm, Mikael ; Angelou, Nikolas ; Hansen, Per ; Hansen, Kasper Hjorth ; Mikkelsen, Torben ; Haga, Steinar ; Silgjerd, Jon Arne ; Starsmore, Neil . / Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering. Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing. Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing, 2012. pp. 267-270
@inproceedings{6f6b734704cb4e189157c3318c635e0d,
title = "Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering",
abstract = "A ground-based remote sensing short-range WindScanner with agile beam steering based on a modified ZephIR continuous-wave wind lidar (LIght Detection And Ranging) and a double prism arrangement has recently been developed at the Department of Wind Energy at the DTU Ris{\o} campus. The WindScanner measures the line-of-sight component of the wind and by rapid steering of the line-of-sight and the focus position, all locations within a cone with a full top angle of 120 can be reached from about 8 meters out to some hundred meters depending on the range resolution needed. By using three such WindScanners, all three components of the wind can be retrieved. Here, the first mean 2D turbulent wind fields measured in a horizontal and a vertical plane below a hovering search and rescue helicopter are presented. The line-of-sights of two synchronized WindScanners were scanned within the plane of interest. Since both line-of-sights always were inside the plane scanned, the influence of the wind component perpendicular to the plane was avoided. The results indicate that the flow field below a helicopter can be characterized remotely, which can support helicopter optimization regarding, for example, minimizing the risk to aircraft and personnel when operating in a search and rescue role. The results from the application of the short-range WindScanner technology to the complex and turbulent helicopter downwash demonstrates the possibilities also within less demanding flows encountered within complex terrain and wind energy related research for which the WindScanner technology primarily has been developed.",
author = "Mikael Sj{\"o}holm and Nikolas Angelou and Per Hansen and Hansen, {Kasper Hjorth} and Torben Mikkelsen and Steinar Haga and Silgjerd, {Jon Arne} and Neil Starsmore",
year = "2012",
language = "English",
pages = "267--270",
booktitle = "Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing",
publisher = "Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing",

}

Sjöholm, M, Angelou, N, Hansen, P, Hansen, KH, Mikkelsen, T, Haga, S, Silgjerd, JA & Starsmore, N 2012, Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering. in Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing. Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing, pp. 267-270, 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing, Boulder, United States, 05/06/2012.

Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering. / Sjöholm, Mikael; Angelou, Nikolas; Hansen, Per; Hansen, Kasper Hjorth; Mikkelsen, Torben; Haga, Steinar; Silgjerd, Jon Arne ; Starsmore, Neil .

Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing. Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing, 2012. p. 267-270.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering

AU - Sjöholm, Mikael

AU - Angelou, Nikolas

AU - Hansen, Per

AU - Hansen, Kasper Hjorth

AU - Mikkelsen, Torben

AU - Haga, Steinar

AU - Silgjerd, Jon Arne

AU - Starsmore, Neil

PY - 2012

Y1 - 2012

N2 - A ground-based remote sensing short-range WindScanner with agile beam steering based on a modified ZephIR continuous-wave wind lidar (LIght Detection And Ranging) and a double prism arrangement has recently been developed at the Department of Wind Energy at the DTU Risø campus. The WindScanner measures the line-of-sight component of the wind and by rapid steering of the line-of-sight and the focus position, all locations within a cone with a full top angle of 120 can be reached from about 8 meters out to some hundred meters depending on the range resolution needed. By using three such WindScanners, all three components of the wind can be retrieved. Here, the first mean 2D turbulent wind fields measured in a horizontal and a vertical plane below a hovering search and rescue helicopter are presented. The line-of-sights of two synchronized WindScanners were scanned within the plane of interest. Since both line-of-sights always were inside the plane scanned, the influence of the wind component perpendicular to the plane was avoided. The results indicate that the flow field below a helicopter can be characterized remotely, which can support helicopter optimization regarding, for example, minimizing the risk to aircraft and personnel when operating in a search and rescue role. The results from the application of the short-range WindScanner technology to the complex and turbulent helicopter downwash demonstrates the possibilities also within less demanding flows encountered within complex terrain and wind energy related research for which the WindScanner technology primarily has been developed.

AB - A ground-based remote sensing short-range WindScanner with agile beam steering based on a modified ZephIR continuous-wave wind lidar (LIght Detection And Ranging) and a double prism arrangement has recently been developed at the Department of Wind Energy at the DTU Risø campus. The WindScanner measures the line-of-sight component of the wind and by rapid steering of the line-of-sight and the focus position, all locations within a cone with a full top angle of 120 can be reached from about 8 meters out to some hundred meters depending on the range resolution needed. By using three such WindScanners, all three components of the wind can be retrieved. Here, the first mean 2D turbulent wind fields measured in a horizontal and a vertical plane below a hovering search and rescue helicopter are presented. The line-of-sights of two synchronized WindScanners were scanned within the plane of interest. Since both line-of-sights always were inside the plane scanned, the influence of the wind component perpendicular to the plane was avoided. The results indicate that the flow field below a helicopter can be characterized remotely, which can support helicopter optimization regarding, for example, minimizing the risk to aircraft and personnel when operating in a search and rescue role. The results from the application of the short-range WindScanner technology to the complex and turbulent helicopter downwash demonstrates the possibilities also within less demanding flows encountered within complex terrain and wind energy related research for which the WindScanner technology primarily has been developed.

M3 - Article in proceedings

SP - 267

EP - 270

BT - Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing

PB - Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing

ER -

Sjöholm M, Angelou N, Hansen P, Hansen KH, Mikkelsen T, Haga S et al. Helicopter downwash measured by continuous-wave Doppler lidars with agile beam steering. In Extended Abstracts of Presentations from the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing. Steering Committee of the 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing. 2012. p. 267-270