输水管道系统气体特性与水流冲击截留气团研究  

Research on gas properties and current rush to interception air-mass in delivery pipeline system

作　　者：郑源[1] 索丽生[1] 张健[1] 刘德有[1] 

机构地区：[1]河海大学水利水电工程学院,江苏南京210098

出　　处：《水科学进展》2005年第6期858-863,共6页Advances in Water Science

基　　金：国家自然科学基金资助项目(50179008);教育部博士基金资助项目(20010294006)~~

摘　　要：通过试验与理论相结合的方法,对输水管道系统气体特性与水流冲击截留气团进行了研究.研究表明,决定气团主要性质的气体多方指数n在输水管道系统发生水力过渡过程时存在较为显著的变化,并非单一常数,从而提出了相应的四过程:即压缩子过程1、膨胀子过程2、膨胀子过程3和压缩子过程4.在压缩子过程4与膨胀子过程2中,气体多方指数n取值为1.4～1.6;而在压缩子过程1与膨胀子过程3中,气体多方指数n取1.15.气体多方指数n的取值对压力水流冲击截留气团的结果有一定影响,n值越小,水流冲击截留气团的压力越大;反之越小.According to the experimentation and the theory, research on gas properties and current rush to interception airmass in the delivery pipeline system are made . The studies indicated that the gas thermal insulation coefficient determining primary properties of the air-mass changes apparently instead of a single constant when hydraulic transition process happens . So four appropriate processes are given,namely sub-process 1 of compressing, sub-process 2 of inflating, sub-process 3 of infiating, and sub-process 4 of compressing. In the sub-process 2 of inflating and sub-process 4 of compressing, the gas thermal insulation coefficient is 1.4 ～ 1.6, and is 1.15 in other two processes. The value of gas thermal insulation coefficient has definitely influence on the result of the analytic root of current rush to interception air-mass in the delivery pipeline system. The more small gas thermal insulation coefficient is, the more great the press of current rush to interception air-mass is, and and vice versa.

关 键 词：输水管道系统 气体多方指数 水流冲击截留气团 试验研究 

分 类 号：TV134.1[水利工程—水力学及河流动力学]