水力旋流漏斗排砂器的基本原理是將渾水引入漏斗槽內做旋流運動，利用重力及離心力的雙重作用，使水砂分離。高桶式旋流排砂器的漏斗槽具有較高的桶身，使引入的渾水在漏斗槽中有較長的停留時間，以利於排除較細的泥砂。本研究在排砂漏斗槽內安裝環狀懸板，以實驗方式探討懸板配置位置及數量對排砂漏斗排砂效率之影響。研究試驗在直徑 為48公分及高度 為115公分的旋流排砂器進行實驗，實驗水深 為95.7公分。懸板的寬度 為12公分，在高度方面的配置分為底部、中間以及頂部三種，數量配置由一片到三片，其中兩片180度半環狀懸板設置於中間與頂部，250度角懸板則設置於底部。
本研究之清、渾水觀測試驗以及渾水排砂試驗，在固定入流量 為 以及漏斗底孔直徑 為6 的條件下進行，並分別針對不同的懸板配置位置與數量來探討其對流場特性與排砂效率之影響。研究試驗分成清水與渾水試驗兩大部分。於清水試驗中再分為排砂底孔流量的量測、無懸板時清水渦流的特性及懸板對清水渦流特性的影響。在渾水試驗中則分為清渾水交界面特性觀測、無懸板時渾水渦流之特性、懸板對清渾水交界面及渦流特性的影響、懸板對底孔排砂效率之影響。從清水觀測試驗中，在無懸板的條件下，當水體開始溢流後十分鐘，空氣柱長度約48公分，而於設置三懸板的條件下，空氣柱長度僅有2至3公分，此說明設置懸板後明顯減少空氣柱之長度。另外，在有設置上懸板的條件下，表面水流環狀流動主要侷限在自渦流中心起算0.5R至0.6R處(R為漏斗槽半徑)。渾水觀測試驗中，其表面流速較清水條件下慢，而在渦流的變化方面，水體開始溢流後，渾水渦流會消失，清水則否，此現象的原因可能為渾水的黏滯性大於清水所致。排砂試驗方面，於無懸板及設置上、中、下單一懸板條件下，其平均排砂濃度效率 分別為96.07 %、97.70 %、95.95 %以及96.55 %，此說明懸板設置位置對排砂濃度效率的影響，上優於下且下優於中。於雙懸板與三懸板條件下，其平均排砂濃度效率則皆有98 %以上。

According to the basic theorem of hydraulic, muddy water flows into the vortex chamber through tangential inlet, and then muddy water moves as a vortex flow inside the chamber. So water and sediment will be separated due to the gravity and centrifugal force. Deep-type vortex chamber has a higher body of hopper, so muddy water has a longer residence time in the chamber in order to exclude the fine sediment. The ring-type suspended deflectors are set inside the vortex chamber, and the sediment removal efficiency of vortex chamber in experimental methods is discussed by different setting and numbers of suspended deflector. Experimental study is proceeding in the vortex chamber having diameter of 48 cm, height of 115 cm, and experiment water depth of 95.7 cm. There are three suspended deflectors, and the width of them is 12 cm. Each deflector could be installed at the relative position of top, middle, or bottom, numbers of setting is from 1 to 3 flats. The top and middle deflectors are 180 degrees half-ring-type suspended deflectors, and the bottom one is 250 degrees deflector.
In the condition of inflow discharge = and the bottom flushing orifice =6 , with different sets and numbers of suspended deflectors, how deflectors influence on the flow characteristic in the chamber and sediment removal efficiency is discussed, the clear and muddy water observation test and sediment removal efficiency test are also presented in this study. There are two major parts in this research, one is for clear water, and the other one is for muddy water. For clear water experiment, we measure underflow discharge and observe vortex flow characteristic with and without suspended deflectors. For the muddy water experiment, the observation of the interface between clear and muddy water due to the deflector was conducted. The interaction between vortex flow and deflectors was observed, and its effect on sediment removal efficiency is also discussed.
In the observation of clear water, under the condition without installing deflector and after the water overflowing 10 minutes, the air core was 48 cm length, while under the condition with three deflectors, the air core left only 2~3 cm. It is demonstrated that installed deflectors could reduce the length of air core significantly. Besides, under the condition with top deflector, the water surface moving as a vortex flow was restricted at the region from the center of chamber outward to 0.5R~0.6R (R is the radius of chamber). From the observation of muddy water, it is found that the surface velocity is more slowly compared with the condition of clear water. When muddy water started overflowing for a while, the muddy water vortex would disappear but it does not for clear water. This phenomenon might be due to the viscosity of muddy water greater than clear water. In the experiment of sediment removal, when the condition without deflector and with one deflector at the top, middle, or bottom, the average sediment concentration removal efficiency, , are 96.07%, 97.70%, 95.95%, and 96.55%, respectively. It is demonstrated that the effect degree of position of deflector on sediment concentration removal efficiency is as follows, the top one is better than bottom one and the bottom one is better than middle one. For the condition with two and three deflectors, their average sediment concentration removal efficiency is more than 98%.

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