Partially filled pipe flows are commonly observed in urban hydraulics, sewers and road crossings. The occurrence of a compression wave in the confined space may result from flash flooding, transient operation or accidental blockage, inducing explosive conditions. In this study, the propagation of a compression wave was studied in a relatively large laboratory flume of semi-circular cross-section. The unsteady flow properties were recorded to understand how the circular cross-sectional shape impacted the surging water propagation. Both free-surface and velocity data indicated a marked impact of the compression wave passage, with large instantaneous fluctuations comparable to and sometimes larger than observations of compression waves in rectangular channels.

中文翻译：

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半圆形通道中的压缩波

在城市水力学、下水道和道路交叉口中通常观察到部分填充的管道流动。在密闭空间中出现压缩波可能是由于闪洪、瞬态操作或意外堵塞导致的爆炸情况。在这项研究中，压缩波的传播是在一个相对较大的半圆形横截面的实验室水槽中研究的。记录非定常流动特性以了解圆形横截面形状如何影响汹涌的水传播。自由表面和速度数据都表明了压缩波通道的显着影响，其瞬时波动与矩形通道中压缩波的观测值相当，有时甚至更大。