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研究生:莊禮盛
研究生(外文):Chuang, Li Sheng
論文名稱:抑制蝴蝶閥所引起的侵蝕現象
論文名稱(外文):The Mitigation of Erosion Phenomena for Butterfly Valves
指導教授:邱政勳, 周榮華
指導教授(外文):Jeng-Shing Chiou, Jung-Hua Chou
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:1998
畢業學年度:86
語文別:中文
論文頁數:97
中文關鍵詞:蝴蝶閥侵蝕流場觀察空蝕
外文關鍵詞:butterfly valveerosionflow-visualizationcavitation
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在管路系統中,蝴蝶閥除了被用來當作流路開關使用外,更經常扮
演著控制流量與節流的角色;由於蝴蝶閥的價格便宜、尺寸範圍廣、阻力
小、重量輕等優點,因此廣泛使用於工業界。 蝴蝶閥在長期使用後,
蝴蝶閥以及下游管路常會造成侵蝕現象,也是廣大使用者所期待改進的問
題。本篇論文以3英吋管徑的水洞作實驗,利用流場觀察、壓力以及振動
的量測來了解侵蝕現象產生的原因。根據實驗結果顯示,在閥盤開啟角
度20-40度時所產生的侵蝕將最大,如果長期在此種角度工作,將減少管
道的壽命。 本篇論文使用五種不同閥盤模型進行實驗,結果顯示模型
五在開啟角度小時,在閥體本身及下游管路所產生的振動很小,此結果表
示在閥盤後方靠近孔口側貼上適當的緩衝物可以改善侵蝕現象。

In a piping system, butterfly valves are often used as a
flow controller to either modulate the flow throttling range or
control the flow's on/off positions. Because butterfly valves
are usually light-weighted and low cost, they have a wide range
in size selection and possess a small flow resistance,
therefore, they are widely accepted in many industrial
applications. After a certain period of service, a
butterfly valve and its downstream pipe wall may be damaged by
erosion. The elimination or mitigation of this kind of erosion
problem is actually the most important issue for a valve user.
An experiment setup is used in this study to investigate the
erosion problem. The water tunnel is 3 inches in diameter and
the pipes are made by transparent PE for the ease of flow
visualization and photograph purpose. At certain key positions,
the pressure and flow vibration level are also measured to
support the observation of possible erosion phenomena. The
results indicate the most serious erosion problem may occur when
the valve open angle is between 20-40 degrees. In this
paper, five different valve disks are used to perform the tests,
the results shows the model 5 have the smallest vibration level
both on the valve stick and its downstream pipe wall under the
critical valve opening angle. These results implies that a
suitable buffer attached on the back side of disk surface near
the orifice side could mitigate the erosion phenomena.

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