改进型旁通管关键参数选择与瞬变压力控制

发布时间：2018-11-14 18:36

【摘要】：为了消除或减小水锤压力对泵输水系统的影响,提出了一种新的水锤防护设备——改进型旁通管,并对其瞬变控制效果进行数值模拟研究,研究结果表明:当水泵事故停泵后,泵后止回阀快速关闭防止水流倒流,同时改进型旁通管按照预设的启闭程序动作,可以达到泄放系统高压消除水锤的目的.文中以特征线方法为基础对改进型旁通管边界条件数学模型进行完善.其次以完善后的边界条件数学模型为基础,对某泵站输水系统事故停泵的水力过渡过程进行数值模拟计算.最后通过6个方案对影响改进型旁通管控制瞬变压力效果的关键参数(改进型旁通管的直径d,长度l和改进型旁通管中液控阀的启闭时间t1,t2,t3,t4)进行敏感性分析研究.研究结果表明:选择合适参数的改进型旁通管能够将输水系统中的瞬变压力控制在合理范围.
[Abstract]:In order to eliminate or reduce the influence of water hammer pressure on pump water conveyance system, a new water hammer protection equipment, improved bypass pipe, is proposed, and its transient control effect is numerically simulated. At the same time, the improved bypass pipe is operated according to the preset opening and closing procedure, which can achieve the purpose of eliminating the water hammer by high pressure in the discharge system. In this paper, the improved mathematical model of Bypass boundary conditions is improved based on the characteristic line method. Secondly, based on the improved mathematical model of boundary conditions, the hydraulic transient process of an accident pump stop in a pumping station is numerically simulated. Finally, the key parameters affecting the transient pressure effect of the improved Bypass tube (diameter, length l of the improved Bypass tube and the opening and closing time of the hydraulic valve in the improved Bypass pipe, t _ 1t _ 2 / t _ 3) are obtained by six schemes. T 4) sensitivity analysis was carried out. The results show that the modified bypass pipe with suitable parameters can control the transient pressure in the water conveyance system within a reasonable range.
【作者单位】：西安理工大学西北旱区生态水利工程国家重点实验室;西安理工大学教育部西北水资源与环境生态重点实验室;
【基金】：国家自然科学基金资助项目(51479160,41471451)
【分类号】：TV675

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