局部管材突变对水锤防护的影响分析

An Analysis of the Effects of Great Material Change of Part Pipes in Long-distance Pipelines on Water Hammer Prevention

某电厂取水工程为长距离低压供水系统,为减少管道投资,除管线中间一段低凹高压管段采用钢管外,大部分管线采用低压的玻璃钢夹砂钢管。因玻璃钢夹砂钢管与钢管两种管材的弹性模量相差较大,故在管线中形成了局部管材突变。发生水锤时正反水锤波都将在管材突变处被反射,加剧了水锤波动。文中通过数值计算分析了这种局部管材突变对水锤防护的影响。

The water intake project of a power plant is a long-distance and low-pressure water supply project. To save investment in pipes, the GFRP sand inclusion steel pipes with low pressure are adopted almost in the whole pipeline except that in a part of the pipeline in low elevation the steel pipes with high water pressure are adopted. As there is a great difference between the elastic modulus of the GRP sand inclusion steel pipes and that of the steel pipes, the pipe material changes greatly in a part of the pipeline. In case of a water hammer, whether the forward waves or the back waves will be reflected at the place where the two kinds of pipes are combined, thus the water hammer will be exacerbated. An analysis of the effects of great material change of some pipes on water hammer prevention is made by a numerical calculation.