多孔式指向性地表風速計之開發與風洞實驗應用

DEVELOPMENT AND WIND TUNNEL EXPERIMENTAL APPLICATION OF MULTI-HOLE TYPE DIRECTIONAL IRWIN WIND SENSOR

10.6652/JoCICHE.201912_31(8).0002

鍾政洋(Cheng-Yang Chung)；周晉成(Chin-Cheng Chou)；鍾光民(Kung-Ming Chung)

風洞實驗 ； 指向性地表風速計 ； 行人環境風場 ； wind tunnel experiment ； directional Irwin wind sensor ； pedestrian-level wind

中國土木水利工程學刊

31卷8期（2019 / 12 / 01）

693 - 701

繁體中文

地表風速計（Irwin wind sensor）已被廣泛應用於行人環境風場之評估，其量測之平均與擾動壓差可經由率定關係求得該處之平均與擾動風速，並配合氣象統計資料進行分析，已為評估行人風場之優秀工具。而原始形式之地表風速計並不考慮風向角之量測，而在特定情況下，若欲了解測點處風向之變化，則勢必需要改變量測方式以獲得風向角資訊。本研究擬提出一具可同時量測行人環境內風速與風向能力之新型指向性地表風速計，藉由在原始地表風速計特定距離周圍鑽設數個壓力量測孔位，並量測其壓力分佈與風向角變化之關係，率定出回歸函數，並與參考風速與風向角進行驗證比對。本研究選取均勻流況進行指向性地表風速計之函數率定分析，檢視其適用性，並對三種表面壓力孔位之試驗資料進行系統化分析，建議出各參數下之壓力分佈與風向角變化之率定函數，以作為後續相關研究或檢測業務之參考。

The Irwin wind sensor has been widely used for measuring mean and fluctuating wind speed near the ground surface for evaluation of pedestrian-level wind condition. Because of its simple design, the Irwin wind sensor is not capable to extracting the wind direction information from the pressure difference between sensor top and ground level in wind tunnel experiment. A new-type directional Irwin wind sensor (DIWS) for measuring pedestrian-level wind speeds and wind direction simultaneously in wind tunnel is described. Similar to the Irwin wind sensor, it is axisymmetric and a series of holes (four, five and six holes) connected to pressure tubes have been set just on the probe surface in specific distance to the central tube. The calibration of wind speed refers to Irwin wind sensor literature, and the determination of wind direction needs to be calibrated by comparing mean pressure differences between all the surface tubes and the central tube at each wind direction (0° to 360°, interval of 10°). In uniform flow condition, by performing wind tunnel experiments with the directional Irwin wind sensor in three series of holes cases, the performance of the sensor will be investigated. The calibration formulae for all the parameter cases can be adopted as a database for further relative research and commercial test facilities.

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