长距离重力流输水管线水锤防护与优化研究OA

Long-distance gravity-flow water conveyance pipelines are prone to water hammer under complex terrain conditions and strong flow inertia,which seriously threatens pipeline safety and operational stability and may even cause pipe rupture or equipment failure.Taking a long-distance gravity-flow water conveyance project with large terrain undulations in northwest China as a case study,a hydraulic transient model based on the method of characteristics was established.The influence of downstream valve-closing time on pressure variation along the pipeline was analyzed,followed by structural parameter optimization of a bidirectional surge tank.Finally,a combined protection strategy integrating the optimized surge tank with a pressure relief valve was proposed.Results indicate that for long-distance pipelines with complex topography,extending the linear valve-closing time has no significant effect on extreme pressures along the pipeline.The effects of surge tank parameters on positive pressure follow the descending order:connecting pipe diameter>tank diameter>tank height.The optimized bidirectional surge tank combined with a pressure relief valve effectively controls transient pressures along the pipeline.The findings provide valuable guidance for water hammer protection in similar gravity-flow conveyance projects.