INCORRECT WIND MEASUREMENT DUE TO ICING ON HEATED ULTRASONIC ANEMOMETER
In cold climates, ultrasonic anemometers sometimes measure extraordinary higher winds compared with the mean values during the respective periods of measurement. The problem is that these irregular readings are below the ultimate maximum wind speed, which cannot be eliminated from the series of record in some theoretical manner. Field measurements indicated that these cases occurred accompanied by precipitation and temperature below or just above freezing. In order to know what may cause the irregulars, icing wind tunnel tests were conducted. It turned out that ice accretion with a gap between the transducer surface of the ultrasonic anemometer and the inner surface of the ice deposit would be the cause of the incidence. The secondary icing, due to refreezing of the molten water generated by a heater installed in the transducer, may be another reason for incorrect measurement in snowy conditions as well.
Shigeo Kimura Hiroshi Morikawa Takeshi Sato Yoichi Yamagishi T,Tetsuya Kojima
Dept.of Mech.Eng.Kanagawa Inst.f Tech.1030 Shimo-Ogino Atsugi Kanagawa Japan 243-0292 Meteorological Research Institute for Technology 1-30-17 Hongo Bunkyo Tokyo Japan 113-0033 Nat.Res.Inst.for Earth Sci.& Disaster Prev.1400 Tokamachi Shinjo Yamagata Japan 996-0091
国际会议
The 14th International Workshop on Atmospheric Icing of Structures(第十四届结构物大气覆冰国际研讨会 IWAIS 2011)
重庆
英文
10
2011-05-08（万方平台首次上网日期，不代表论文的发表时间）