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随着长距离跨流域调水工程的逐渐增多,输水管道的安全问题也日益突出,其中水锤对长距离输水管道的危害很大,因而长距离输水工程中管线安全防护的研究变得刻不容缓,而重力流作为一种高效节能的输水方式,其安全性也应受到高度关注。选用合适的水锤防护措施和合适的关阀方式,是优化工程设计、保障长距离输配水管线的安全运行的重要前提,具有重要的理论意义和实用价值。以国内某长距离输水工程为例,分别对是否采用空气阀、以及不同关阀方式和关阀时间的组合方式下的长距离管道输水工程的关阀水锤进行计算和分析,得到了管道沿程的最大水头和最小水头线。通过对比发现,在空气阀水锤防护措施下,并采用两阶段关阀方式,可以缩短关阀时间的同时还降低管路最大压力和最小压力,保障输水管线的安全运行。
With the gradual increase of long-distance inter-basin water diversion project, the safety of water pipelines has become increasingly prominent, of which the water hammer is very harmful to long-distance water pipelines. Therefore, the research on pipeline safety protection in long-distance water diversion projects It is imperative that the gravity flow be an efficient and energy-saving method of water conveyance, and its safety should also be highly concerned. The selection of suitable water hammer protection measures and the appropriate valve closing method are important preconditions for optimizing the engineering design and ensuring the safe operation of long-distance transmission and distribution water pipelines, which has important theoretical significance and practical value. Taking a domestic long-distance water conveyance project as an example, we calculated and analyzed whether to adopt the air valve and the valve closing water hammer of the long-distance pipeline water diversion project under the combination of different valve closing methods and valve closing time. Pipeline along the largest head and the smallest head line. The comparison shows that in the air valve water hammer protection measures, and the use of two-stage valve closure, valve closing time can be shortened while reducing the maximum pressure and minimum pressure pipeline to ensure the safe operation of water pipelines.