【作者】 马超；

【导师】 杨玉思；

【作者基本信息】 长安大学 ， 市政工程， 2010， 硕士

【摘要】 随着经济的迅速发展和人口不断增长,以及水资源分布不均加之气候变化,区域性缺水非常严重。以往小范围内的调水已难以满足一些地区的用水需求,迫切需要修建一些长距离的调水工程解决区域水资源分配不均匀的问题,从而实现水资源的优化配置。长距离有压输水管道中的水力过渡过程比较复杂,事故停泵时,如果没有合理的水锤防护措施,这类输水系统很可能发生破坏性很大的水锤事故。通过计算机模拟事故停泵时系统的水力过渡过程,准确预测水锤升压为选择经济有效的水锤防护措施提供依据。目前,水泵处水力过渡过程主要取决于水泵机组的惯性方程,水泵机组转动惯量是描述水力过渡过程中水泵运转工况的重要参数,但是目前机电产品的改进换代较快,在工程中如何选择合适转动惯量的水泵或者如何加装多大的飞轮,对长距离输水工程具有指导性意义。本文结合苏丹港长距离输水工程及平岗输水工程实例,用C++语言编写计算机程序进行停泵水锤计算分析。主要分析了加大水泵机组转动惯量或增装飞轮对停泵水锤计算结果的影响。通过本文分析研究表明,在高扬程的输水工程采用转动惯量大的水泵机组或增装惯性飞轮时,水泵出口处水锤升压、降压减小；水泵机组反转数降低；水泵处流量为负的时刻出现延后；水泵机组(最大)反转数出现的时刻,延后；输水工程中有水柱分离以及断流再弥合水锤出现的潜在危险时,采用转动惯量大的水泵机组或增装惯性飞轮,对水锤防护的效果尤其明显。对于平坦管道,无明显效果。更多还原

【Abstract】 With the rapid economic development and population growth, and uneven distribution of water resources coupled with climate change, regional water shortage is very serious.,Water transfer within a small area in the past have been difficult to meet the demand for water in some areas,,Urgent need to build a number of long-distance water transfer project to solve the problem of regional water resources uneven distribution,,In order to achieve the optimal allocation of water resources.Long distance pressure pipeline in the transition process is relatively complicated hydraulic,When pumping accidents,,If there is no reasonable water hammer protection, Distribution system is likely to occur such devastating incidents of water hammer., Computer simulation of the accident by stopping the hydraulic pump when the system transition process,,Predict water hammer boost for the selection of cost-effective to provide evidence of water hammer protection.。Currently,,Pump for hydraulic transition process depends on water pump inertia equation,。Pump inertia is to describe the operation of the hydraulic pump during the transition condition of the important parameters,However, the improvement and updating of existing machinery and electronic products faster,In the project to choose a suitable moment of inertia of the pump or how much of the flywheel installed,Long-distance water diversion project on the guiding significance.In this paper, examples of Port Sudan Water Transfer Project,Using C++ language computer program for calculating Water hammer analysis,Mainly analyzes the moment of inertia the pump stops pumping of rotational inertia on the results of calculation of water hammer.This analysis shows that Lift the water diversion project in the high moment of inertia using high-volume water pump, or by loading when the inertia flywheel,The outlet of the water hammer pump boost, buck reduced;Pump reversal reduce;The time of Service flow pumps appear negative is delayed;The time of Water Pump (maximum) number of emerging reversal is delayed;When Water supply project in the water column separation and drying and then to bridge the potential danger of water hammer occurs, By inertia or by volume of the pump unit mounted flywheel;The effects of water hammer is particularly evident。For the flat channel is no significant effect.更多还原