Taking a large-scale water supply project in Gansu as the research background,the water supply pipeline of the pumping station has obvious undulations,high head and large flow rate.After the pump was shut down in an accident,the negative pressure in the pipeline was se-vere,and it cannot be eliminated by adding an air valve.Based on the characteristic line method and HAMMER software,a simulation analysis of the hydraulic transition process of the pump sta-tion during emergency pump shutdown was conducted using a combination of two-stage closed hy-draulic control eccentric hemisphere valve and air chamber.In addition,the influence of the main parameters of the air chamber on the hydraulic transition process was analyzed.The calculation re-sults show that the negative pressure in the pipeline is significantly solved after setting up the air chamber;The larger the volume of the air chamber,the higher the head loss ratio,and the smaller the diameter of the water tank inlet,the better the water hammer protection effect;The air cham-ber plays an important role in the water hammer protection process by replenishing and absorbing water from the pipeline for the first time;The time for the air chamber to replenish water to the pipeline for the first time under different parameters is almost the same.
关键词
空气罐/水锤防护/水头损失比率/预设压力/供水工程
Key words
Air chamber/Water hammer protection/Loss coefficient/Preset pressure/Water supply engineering
维普
万方数据