EXPERIMENTAL STUDY ON MEASUREMENT OF TURBULENCE IN WIND TUNNEL : Measurement with Thermistor-Anemometer Having High Response

DOI Web Site Web Site Web Site

Bibliographic Information

Other Title
  • 風洞実験における風速変動量の測定に関する研究 : 高応答特性を有するサーミスタ風速計を用いた場合
  • フウドウ ジッケン ニ オケル フウソク ヘンドウリョウ ノ ソクテイ ニカン

Search this article

Abstract

Measurement of the air flow around the building simulated in the wind tunnel is a major problem for wind tunnel techniques. In this paper, a report is made on a trial anemometer which can measure the air flow suitable for assessing wind environment and the validity of such an anemometer. In the first step of the investigation, the thermistor-anemometer was improved so that it will possess high response and its response was examined by placing it in the pulse wind which fluctuates only in the main flow direction together with a hot-wire anemometer. In the next step, difference between the results of measurement of the air flow around the building by using the thermistor-anemometer and that by using the conventional hot-wire anemometer was examined in the wind tunnel, simulating the air flow around the building by using an urban model. Through the tests the following results were obtained. 1) The response of thermistor-anemometer can be indicated by reduction in variation, and its reductionis 20% at 10Hz, 41% at 20Hz and 56% at 30Hz. 2) If the reduction is corrected in connection with power spectral density, it is possible to analize quantitatively turbulence up to 40Hz. 3) The directional characteristic is smaller than that of the hot-wire anemometer (I-type probe), and so it is possible to measure the magnitude of the total velocity more correctly in the turbulent air flow near the ground level. 4) Mean wind velocity near the ground level measured by the thermistor-anemometer is higher than that measured by the hot-wire anemometer (I-type probe). The magnitude of the fluctuation component measured by the thermistor-anemometer is greatly different from that measured by the hot-wire anemometer at some flow points near the building.

Journal

Details 詳細情報について

Report a problem

Back to top