排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (2): 112-117    DOI: 10.3969/j.issn.1674-8530.18.0061
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液控蝶阀联动的混流泵机组启动过程数值模拟
周大庆, 姜胜文, 陈会向
河海大学能源与电气学院,江苏 南京211100
Numerical simulation of startup process of mixed flow pump unit combined with hydraulic control butterfly valve action
ZHOU Daqing, JIANG Shengwen, CHEN Huixiang
School of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 211100, China
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摘要 为准确预测混流泵机组启动过程的瞬态特性,建立了具有液控蝶阀的某立式混流泵站全过流系统的三维几何模型,运用滑移网格法实现蝶阀的开启规律,结合三维非定常流动过渡过程研究手段,完成对混流泵机组启动过程数值计算,获得了机组启动过程外特性参数和若干测点静压值随时间的变化规律以及不同时刻内部流场瞬变特性.计算结果表明,机组启动过程最大反转转速为正向额定转速的0.16倍,水泵出口最高压力为额定值的1.26倍,均未超过允许值;机组处于泵工况转速趋于稳定时,泵段内水流流态和压力梯度变化受蝶阀开度影响明显,小开度时,泵段内压力梯度较大,最大压差为45.6 m,为额定扬程的1.62倍;高压水以射流的方式通过蝶阀从而在其出水侧产生回流,导致蝶阀两侧压差剧烈波动诱发阀体振动.
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周大庆
姜胜文
陈会向
关键词液控蝶阀   混流泵机组   启动过程   三维数值模拟   蝶阀开度     
Abstract: The startup transient characteristics of a mixed flow pump with a hydraulic controlled butterfly was predicted using the unsteady numerical approach based on the method of sliding grid to realize the opening rule of butterfly valve after the establishment of the whole flow system geometrical model of the pump station. Then the external characteristics of the pump unit and static pressure at monitoring points against time as well as the internal flow transient changes were obtained. Numerical results show that the maximum reverse speed of the starting process of the unit is 0.16 times the rated speed, and the highest pressure in the pump outlet is 1.26 times the rated value, and neither of them exceeds the permissible value. When the unit speed shows a stable tendency, the flow characteristics and the pressure gradient change in the pump are mainly affected by the butterfly valve opening. While at the small opening , the pressure gradient in the pump is larger, and the maximum differential pressure reaches 456 m(1.62 times the rated lift). The high pressure water flows through the butterfly valve in the form of the jet and generates a backflow on the outlet side, which results in a drastic fluctuation of the differential pressure on both sides of the butterfly valve and easily induces the vibration of the valve body.
Key wordshydraulic control butterfly valve   mixed flow pump unit   startup process   threedimensional unsteady numerical simulation   butterfly valve opening   
收稿日期: 2018-03-30;
基金资助:国家自然科学基金重点项目(51339005)
引用本文:   
周大庆,姜胜文,陈会向. 液控蝶阀联动的混流泵机组启动过程数值模拟[J]. 排灌机械工程学报, 2019, 37(2): 112-117.
ZHOU Da-Qing,JIANG Sheng-Wen,CHEN Hui-Xiang. Numerical simulation of startup process of mixed flow pump unit combined with hydraulic control butterfly valve action[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(2): 112-117.
 
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