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In view of the short water hammer control distance of a single air valve in long-distance and low lift water delivery projects, which can not effectively suppress the vacuum in the pipe, a new water hammer control scheme of combined protection of air-valve surge tank and air valve was proposed. Taking a practical project as an example, a comparative analysis of the hydraulic transient process was carried out for the air valve protection and the combined protection scheme of air-valve surge tank and air valve. The results show that the water column separation occurs in the main pipe when the air valve is used for protection, and a large impact water hammer is caused by the rapid exhaust. The combined protection scheme of air-valve surge tank and air valve can not only effectively suppress the vacuum in the main pipe, but also effectively alleviate the impact water hammer caused by exhaust. It is an economic and effective water hammer protection scheme, and can provide a reference for the water hammer protection of other long-distance and low-lift water delivery projects.

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针对长距离低扬程输水工程中单个空气阀的水锤控制距离较短无法有效抑制管内真空等问题，提出了空气阀调压室与空气阀联合防护的新型水锤控制方案，并以某长距离低扬程输水工程为例，对单纯采用空气阀防护以及空气阀调压室与空气阀的联合防护方案开展了水力过渡过程数值模拟与对比分析。结果表明，单纯采用空气阀防护时主管内发生了液柱分离，且因排气过快引发了较大的冲击水锤；而采用空气阀调压室与空气阀联合防护方案不仅能够有效抑制主管内的真空，还可有效缓解排气时引发的冲击水锤，是一种经济且有效的水锤防护措施，可为其他长距离低扬程输水工程的水锤防护提供借鉴。

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吴震（1976-），男，高级工程师，研究方向为水工水力学，E-mail：wuzhen7607@163.com

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吴震（1976-），男，高级工程师，研究方向为水工水力学，E-mail：wuzhen7607@163.com

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