Anemometry in icing conditions

Lasse Makkonen (Corresponding Author), Pertti Lehtonen, Lauri Helle

    Research output: Contribution to journalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    The accuracy of wind measurements in icing conditions is discussed, and wind tunnel calibrations as well as field comparisons are presented for three heated anemometers that use different measuring principles. It is pointed out that ice-free anemometer calibrations, including those provided by manufacturers, are affected by the blockage effect in wind tunnels that are too small. Some anemometers that measure correctly in a wind tunnel give erroneous results in the field. Overall, measuring mean wind speeds and peak values in icing conditions with the accuracy of about 5% seems possible with the present technology, both with rotational and sonic anemometers, but in the most severe environments only some internally heated rotational anemometers are reliable. Wind measurements in icing conditions without due consideration of anemometer selection, specific instrument problems, calibration inaccuracies, mean vertical velocity component, and anti-icing of the supporting structures may result in very big errors.
    Original languageEnglish
    Pages (from-to)1457-1469
    Number of pages13
    JournalJournal of Atmospheric and Oceanic Technology
    Volume18
    Issue number9
    DOIs
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed

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    anemometer
    Anemometers
    wind tunnel
    Wind tunnels
    wind measurement
    Calibration
    calibration
    Ice
    wind velocity
    ice

    Cite this

    Makkonen, Lasse ; Lehtonen, Pertti ; Helle, Lauri. / Anemometry in icing conditions. In: Journal of Atmospheric and Oceanic Technology. 2001 ; Vol. 18, No. 9. pp. 1457-1469.
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    abstract = "The accuracy of wind measurements in icing conditions is discussed, and wind tunnel calibrations as well as field comparisons are presented for three heated anemometers that use different measuring principles. It is pointed out that ice-free anemometer calibrations, including those provided by manufacturers, are affected by the blockage effect in wind tunnels that are too small. Some anemometers that measure correctly in a wind tunnel give erroneous results in the field. Overall, measuring mean wind speeds and peak values in icing conditions with the accuracy of about 5{\%} seems possible with the present technology, both with rotational and sonic anemometers, but in the most severe environments only some internally heated rotational anemometers are reliable. Wind measurements in icing conditions without due consideration of anemometer selection, specific instrument problems, calibration inaccuracies, mean vertical velocity component, and anti-icing of the supporting structures may result in very big errors.",
    author = "Lasse Makkonen and Pertti Lehtonen and Lauri Helle",
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    language = "English",
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    Anemometry in icing conditions. / Makkonen, Lasse (Corresponding Author); Lehtonen, Pertti; Helle, Lauri.

    In: Journal of Atmospheric and Oceanic Technology, Vol. 18, No. 9, 2001, p. 1457-1469.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Anemometry in icing conditions

    AU - Makkonen, Lasse

    AU - Lehtonen, Pertti

    AU - Helle, Lauri

    PY - 2001

    Y1 - 2001

    N2 - The accuracy of wind measurements in icing conditions is discussed, and wind tunnel calibrations as well as field comparisons are presented for three heated anemometers that use different measuring principles. It is pointed out that ice-free anemometer calibrations, including those provided by manufacturers, are affected by the blockage effect in wind tunnels that are too small. Some anemometers that measure correctly in a wind tunnel give erroneous results in the field. Overall, measuring mean wind speeds and peak values in icing conditions with the accuracy of about 5% seems possible with the present technology, both with rotational and sonic anemometers, but in the most severe environments only some internally heated rotational anemometers are reliable. Wind measurements in icing conditions without due consideration of anemometer selection, specific instrument problems, calibration inaccuracies, mean vertical velocity component, and anti-icing of the supporting structures may result in very big errors.

    AB - The accuracy of wind measurements in icing conditions is discussed, and wind tunnel calibrations as well as field comparisons are presented for three heated anemometers that use different measuring principles. It is pointed out that ice-free anemometer calibrations, including those provided by manufacturers, are affected by the blockage effect in wind tunnels that are too small. Some anemometers that measure correctly in a wind tunnel give erroneous results in the field. Overall, measuring mean wind speeds and peak values in icing conditions with the accuracy of about 5% seems possible with the present technology, both with rotational and sonic anemometers, but in the most severe environments only some internally heated rotational anemometers are reliable. Wind measurements in icing conditions without due consideration of anemometer selection, specific instrument problems, calibration inaccuracies, mean vertical velocity component, and anti-icing of the supporting structures may result in very big errors.

    U2 - 10.1175/1520-0426(2001)018<1457:AIIC>2.0.CO;2

    DO - 10.1175/1520-0426(2001)018<1457:AIIC>2.0.CO;2

    M3 - Article

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    SP - 1457

    EP - 1469

    JO - Journal of Atmospheric and Oceanic Technology

    JF - Journal of Atmospheric and Oceanic Technology

    SN - 0739-0572

    IS - 9

    ER -