侯建国,郭亚洁,阎庆绂.有气阀的长距离输水管道流动特性分析与应用[J].水利学报,2002,33(1):0086-0092 |
有气阀的长距离输水管道流动特性分析与应用 |
Analysis on the flow characteristics of long distance pipeline equipped with ventilation valve |
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DOI: |
中文关键词: 气阀 输水管道 特性 计算 |
英文关键词: ventilation valve water conveyer system flow characteristics unsteady flow |
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中文摘要: |
长距离输水管道为了补(排)气需要安装气阀,气阀工作时在阀附近的管道内会形成空穴,并且以气阀为中心,上下游管系、空穴和气阀组成一个局部的小系统,形成管系水流特性、空穴参数和过阀气流特性的连续同步变化,并使管内出现振荡流动。本文通过计算实例对过阀气流参数按等熵流动过程计算,空穴参数按等温过程计算,上、下游管系内的水流特性则按非定常流动计算,其计算结果基本符合实际情况。由此得到的过阀气流的质量流量,可用于选择气阀的过流面积,而管系内水流的振荡流动特性,可供管道系统设计、气阀布设安装时参考。 |
英文摘要: |
Air valve is necessary for long distance pipeline. The flow in the vicinity of valve within the pipe is very complicated. Cavity may occur and oscillating flow may happen. A method is proposed to analysis the characteristics of this kind of transient flow. The assumptions of constant entropy and constant temperature are adopted. The unsteady flow in the pipeline system can be calculated. An example is given for demonstration. |
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