|
|
|
| Effects of surge anticipation valve on water hammer in pumping station |
| (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China) |
|
|
|
|
Abstract Effects of surge anticipation valve on water hammer process in a pumping station with high head were analyzed by means of the water hammer theory and method of characteristics, the optimized combinations of the related parameters of the valve were explored as well. The transient processes were analyzed under 13 opening and 10 closing modes for the surge anticipation valve. It was found that the surge anticipation valve can effectively suppress the highest pressure in the pumping station system; unfortunately it also can reduce the lowest pressure in the system in some circumstances. The opening time period, fully opening time period and closing time period are the three key parameters that affect the protective effect on water hammer pressure for a surge anticipation valve. There is an optimal combination among them to keep the highest pressure being at the lowest level and with a minimum drop in the lowest pressure. Also, it was found that the valve must be fully opened before the first pressure wave arrives under the accidental pumpstop condition. To avoid further declination in the lowest pressure caused by too much water leakage, it is suggested that the fully opening time period should maintain short. The highest pressure in the system declines with increasing closing time period; so a longer closing time period is more in favor of protective effect on water hammer pressure for an anticipation valve. The results may be useful to water hammer protection with surge anticipation valves in a newly built or existing pumping station with high head.
|
|
Received: 12 November 2012
Published: 31 May 2013
|
|
|
|
| ［1］刘志勇, 刘梅清. 空气阀水锤防护特性的主要影响参数分析及优化［J］. 农业机械学报, 2009, 40(6): 85-89.Liu Zhiyong, Liu Meiqing. Analysis and optimization of main influencing parameters for waterhammer prevention characteristic of air valves［J］. Transactions of the Chinese Society for Agricultural Machinery, 2009, 40(6):85-89.(in Chinese)［2］刘竹青, 毕慧丽, 王福军. 空气阀在有压输水管路中的水锤防护作用［J］. 排灌机械工程学报, 2011, 29(4):333-337.Liu Zhuqing, Bi Huili, Wang Fujun. Effect of air valves on water hammer protection in pressure pipelines［J］. Journal of Drainage and Irrigation Machinery Engineering, 2011, 29(4):333-337.(in Chinese)［3］王文全, 张立翔,闫妍, 等. 长距离输水系统停泵水锤的数值模拟［J］. 农业机械学报, 2010, 41(11): 63-66.Wang Wenquan, Zhang Lixiang, Yan Yan, et al. Numerical simulation of the water hammer caused by accidental pumpstop in long water supply systems［J］. Transactions of the Chinese Society for Agricultural Machinery, 2010,41(11):63-66.(in Chinese)［4］杨开林. 控制输水管道瞬态液柱分离的空气阀调压室［J］. 水利学报, 2011, 42(7): 805-811. Yang Kailin. Airvalve surge tank for controlling liquid column separation in water supply projects［J］. Journal of Hydraulic Engineering, 2011, 42(7):805-811.(in Chinese)［5］Kim SangHyun. Design of surge tank for water supply systems using the impulse response method with the GA algorithm［J］. Journal of Mechanical Science and Technology, 2010,24(2):629-636.［6］Stephenson D. Simple guide for design of air vessels for water hammer protection of pumping lines［J］. Journal of Hydraulic Engineering, 2002,128(8):792-797.［7］樊立虎. 长治市辛安引水二期工程水锤消除方法及原理［J］. 山西建筑, 2003,29(8):151-152.Fan Lihu. Method to arrest water hammer in the second stage of Xin′an diversion works in Changzhi［J］. Shanxi Architecture, 2003,29(8):151-152.(in Chinese)［8］Bentley. HAMMER V8i User′s Guide［M］. Pennsylvania: Bentley Systems Incorporated, 2008.［9］安荣云, 陈乙飞. 高扬程长距离输水管线停泵水锤分析与防护［C］／／全国给水排水技术信息网2009年年会论文集. 北京:［s.n.］, 2009:219-226.［10］Wylie E B, Streeter V L, Suo Lisheng. Fluid Transients in Systems［M］.Englewood Cliffs,NJ:Prentice Hall, 1993.［11］AWWA. Manual of Water Supply PracticesM51: AirRelease, Air／Vacuum, and Combination Air Valves ［M］. Denver: AWWA, 2001. |
|
|
|
