空气阀的水锤防护性能及其在联合防护中的应用  

Performance of Air Valve in Water Hammer Control and Application in Combined Control

作　　者：郑兴兴 张健[1] 何喻[1] 苗帝[1] 

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2014年第2期167-170,63,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51079050)

摘　　要：输水工程中空气阀通过进排气来控制管道内的压力,管道内出现复杂的气液两相流过渡过程,其最大进气量和排气完毕后的弥合水锤限制了空气阀在水锤防护中的应用。通过对空气阀动作过程的分析,确定空气阀设置点的初始压力、最大降压量及空气阀的排气速度对其防护性能影响最大。在特征线法基础上用工程算例对不同位置的空气阀的进排气情况进行了对比分析,证实空气阀可以作为水锤防护的辅助措施和其他防护措施联合使用,承担一定的消减水锤的任务,并通过将空气阀布置在管道的后部来提高空气阀在水锤防护中的可靠性。In water conveyance project, air valve control the pressure of pipeline by intaking or exhausting the air, and the gas liquid two phase transition process is rather complex. The maximum air inflow in the pipe and the pressure rise after air exhaust limit the use of air valve in water hammer control. By analyzing the intake and exhaust physical process of air valve, it obtains that the initial pressure, maximum pressure drop after pump power off and the exhaust speed affect the performance of air valve. Based on the characteristic method, through analyzing the effect and process of air valve in different positions with project examples, it confirms that the air valve can be used as a auxiliary water hammer control measure with other measures. At the same time, the air valve can be settled at the posterior of the pipeline to improve the reliability of the air valve in water hammer control.

关 键 词：输水工程 水锤防护 进气量 弥合压力 空气阀设置 联合防护 

分 类 号：TV134[水利工程—水力学及河流动力学]