本研究利用圓柱體渦流溢放機制開發一款適用於偵測環境風況之渦流風速感測器(Vortex Anemometer)，其外型結構簡單，製造成本低廉，且無轉動部件，妥善率極高，具有良好之風向適應性與風速預測一致性。論文主架構分成三個部分，分別針對數值模擬、風洞實驗與現場量測進行分析與討論，逐步建立渦流式風速計之技術發展與性能驗證。HHT為本風速計研究開發與資料處理之核心，為防止雜訊問題以及本質模態函數於瞬時頻率計算上之偏差，使風速運算系統失效，吾人透過訊號濾波、資料分段以及統計方法(Data Binning)相關技術強化風速計效能。當風場風速值大於10m/s、濾波器選定 Δf=40 Hz、資料以每四秒為ㄧ筆、輸出頻率設定為5Hz，本風速運算系統將處於理想以及可靠之運作狀態，風速量測不確定度普遍低於2%，伴隨著風速量值之提高，其誤差可望低於1%。透過此新型風速計之研製，可望為風速量測技術開創一個新的選擇。

Flow over a bluff body has been studied extensively for the past century and the well-known Kármán vortex street phenomena is widely used in practice. This thesis presents the principle and description of the new, entirely static device for measurement of wind speed using the vortex shedding phenomena behind a circular cylinder, furthermore an anemometer which can catch the instantaneous wind speed and acclimate to the wind direction variations excellently. In this research the development of wind sensor based on vortex shedding phenomena from a circular cylinder can break into three parts including CFD numerical simulation, wind tunnel experiment, and on-site measurement respectively. A simple wind speed signal analysis algorithm based on the Hilbert-Huang transform (HHT) is first presented. However due to empirical difficulties from turbulence effects in wind tunnel experiments and wind gust fluctuations during on-site measurement, a new modified wind speed signal analysis algorithm is developed to deal with signal noises issues. By using band-pass filtering process and data binning average process, the vortex anemometer can result the wind speed with an accuracy below 1% if the coming flow wind speed is more than 10 m/sec in this research. This vortex anemometer has the advantages of long-term stability, well repeatability, low maintenance costs, and absence of moving parts; moreover an excellent accuracy with high dynamic frequency response which provides a new revolution and choice of measuring the wind speed in turbulent flow.

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