本文之首要目的在於校驗內政部建研所之低速循環式環境風洞(Environment Wind Tunnel)，該風洞設有兩測試區，第一測試區截面積為4m×2.6m，長度為36.5m，校驗後流速最高可達36m/s；第二測試區之截面積6m×2.6m，長21m，流速最高為22m/s。流場品質方面主要針對第一測試區進行校驗，經由初步測試並與相關文獻比較後，大致上得到令人滿意的流場品質：入口截面之速度均勻度在低中高三組流速下平均約0.37%，截面中心之紊流強度則低於0.3%，空風洞之邊界層厚度在入口處(x=2m)約60mm。速度20m/s時氣流偏向角α角(pitch angle)與β角
(yaw angle)分別落在±0.415度及±0.97度之範圍。另外，在入口速度為30m/s時，風洞之全壓損失為576.8pa，能量比為0.939。
本文另一目的為研究二維圓柱體之空氣動力流場特性，以建立本風洞實驗室所需之實驗量測能量，實驗所設定之雷諾數範圍在176000~548000之間，屬於邊界層轉換區之範圍。所得阻力係數從1.23降低至0.39，此範圍內雷諾數愈大阻力係數愈低，結果與文獻相符合。並利用表面壓力量測結果進一步探討臨界雷諾數下，二維圓柱體之平均分離點與非定常分離特性。

The main purpose of the study is to calibrate the ABRI wind tunnel that is of closed circuit type with two rectangular test sections. The first test section is 36.5m long and it has a cross section area of 4m×2.6m with maximum speed is approximately 36m/s, the second test section is 20m long and it has a cross section area of 6m×2.6m with maximum speed about 22m/s. The calibration performed included the structural vibration, temperature stability, flow uniformity, turbulent intensity, flow angularity and boundary layer thickness at the inlet of first test section. The results obtained show the flow quality meets design requirements. For instance, at three different velocities measured the mean flow uniformity is less than 0.37%, turbulent intensity is less than 0.35%, boundary layer thickness about 60mm thick at the inlet cross section. At 20m/s, the pitch angle α falls within ±0.415 in degree and yaw angle β falls within ±0.97 in degree. At 30m/s, the total pressure loss and energy ratio are 576.8pa and 0.939, respectively.
The other purpose of this work is to study the aerodynamic flow around a 2-D circular cylinder. For Reynolds numbers 176000 increased to 548000, the drag coefficient were reduced form 1.23 to 0.39 The drag coefficients found show a good agreement with the results reported in the literature. The pressure measurement results allow one to further investigate the time-mean separation point and the characteristic of unsteadiness of flow separation on the 2-D circular cylinder.

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