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頁籤選單縮合
題 名 | 渠流阻塞之流況分析 |
---|---|
作 者 | 施清吉; | 書刊名 | 農業工程學報 |
卷 期 | 34:2 1988.06[民77.06] |
頁 次 | 頁1-17 |
分類號 | 443.1 |
關鍵詞 | 阻塞; 流況; 渠流; |
語 文 | 中文(Chinese) |
英文摘要 | Flow states of a subcritical flow in an open channel due to increasing degress of a hump of channel bottom or a width constriction will undergo three different successive categories: first the upstream and the discharge will remain unchanged, then the upstream flow will gradually be influenced with a continuously decrease in discharge, and finally the flow is completely choked. In a transition of upward step or side contraction, the onset of the subcritical flow being changed to the critical flow is a prerequisite to choking. After choking, discharges through a transition are subject to the following five equations: the continuity and the momentum equations for a moving surge, the continuity and the energy equations applied to a transition, and the critical flow after the transition. The shape of solution field of the above five simultaneous equations depends upon the types of transitions. A transition of hump in a open channel flow will result in a shape of solution formed by two triangles which join together with a common apex in the middle; while it consists with only an inverse traingles for a transition of width constriction. Part to boundaries of the solution field are two constant Froude lines; i.e., the upstream Froude numbers equal to 1 and 0. Except for completely choking, both the head loss coefficient of nonuniform flow and the discharge affect positions and shifts of constant Froude lines, especially for high values of head loss coefficient and discharge. In this situation part of solution field will shift across the limiting boundary, and becomes meaningless, as the solution in this part represents either a downward step or a side expansion. |
本系統中英文摘要資訊取自各篇刊載內容。