Inverted siphon with multiple channels different in size
An inverted siphon and multi-channel technology, applied in construction, hydraulic engineering equipment, underwater structures, etc., can solve problems such as easy to cause aerated water flow, large difference in inverted siphon water head loss, and lower water level at the inlet of the inverted siphon
Inactive Publication Date: 2018-09-28
POWER CHINA KUNMING ENG CORP LTD
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Problems solved by technology
When the flow rate of water delivery is large, the inverted siphon often adopts the form of multi-channels, and when the inverted siphon is long, the head loss of the inverted siphon varies greatly under different flow rates, and the head loss and the water level at the outlet of the inverted siphon vary with the flow rate. Less and lower, resulting in lower water level at the inlet of the inverted siphon
This will cause the water level at the inlet of the inverted siphon to be lower than the top elevation of the inlet of the inverted siphon when the flow rate is small, which may easily cause aerated water flow, and the aerated water flow is not good for the safe and stable operation of the inverted siphon. Generally, an inverted siphon is required No matter what kind of flow conditions the inlet and outlet operate, a certain submerged water depth is guaranteed
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[0027] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0028] Such as figure 1 As shown, the multi-channel different-sized inverted siphon with 4 channels, the inlet section is connected to the upstream tunnel, and the outlet section is connected to the downstream tunnel. The inverted siphon is composed of 4 channels, and the water flow of the inverted siphon is 100m 3 / s, the length is about 9500m, the circular steel pipe is used for water delivery, the roughness of the steel pipe is 0.012, and the local head loss coefficient of the pipeline is 2.65 (the equivalent is the local head loss coefficient based on the pipeline speed head, including the inlet and outlet of the inverted siphon The local water head loss coefficient of the pool and the connection section, and assuming that the pipe size is different, the local head loss coefficient remains unchanged), in order to ensure that the water lev...
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The invention relates to the structural style of an inverted siphon in a water conveying system, in particular to an inverted siphon with multiple channels different in size. According to the technical scheme, the inverted siphon with the multiple channels different in size is characterized in that the inverted siphon is formed by at least two inverted siphon channels side by side, and the sizes of the at least two inverted siphon channels are different. In the inverted siphon with the multiple channels different in size, the section shape of each channel can be in forms such as a round shape,a rectangular shape, a gate opening shape and a horseshoe shape. The inverted siphon with the multiple channels different in size is suitable for long distance, the condition that an inlet has enoughsubmergence depth under various running flows of the inverted siphon can be met, and the water flow of the inlet of the inverted siphon can be stable easily and can be easily brought into an invertedsiphon pipe without being mixed with air.
Description
technical field [0001] The invention relates to an inverted siphon structure in a water delivery system, in particular to an inverted siphon structure with multiple channels and different sizes. Background technique [0002] In long-distance water diversion projects, water is often transported through various structural combinations such as tunnels, hidden culverts, inverted siphons, and aqueducts. When the flow rate of water delivery is large, the inverted siphon often adopts the form of multi-channels, and when the inverted siphon is long, the head loss of the inverted siphon varies greatly under different flow rates, and the head loss and the water level at the outlet of the inverted siphon vary with the flow rate. Less and lower, resulting in lower water level at the inlet of the inverted siphon. This will cause the water level at the inlet of the inverted siphon to be lower than the top elevation of the inlet of the inverted siphon when the flow rate is small, which ma...
Claims
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IPC IPC(8): E02B1/00
CPCE02D29/08
Inventor 王超朱国金杨小龙
Owner POWER CHINA KUNMING ENG CORP LTD