Abstract:In view of the phenomenon of "hydraulic" fluctuation and unstable flow generated by high-pressure pipe natural gas in the moment of valve opening and closing, a natural gas gate station in Hubei is taken as an example. Based on the known natural gas pipeline network and other related equipment parameters, the impact of this phenomenon on the safety of natural gas pipeline network is explored and verified. On the one hand, the mechanical equation is used to analyze the natural gas control body which produces the "hydraulic" fluctuation, and the maximum "hydraulic" disturbance pressure is derived to be about 0.093 MPa. On the other hand, the simulation software RealPipe-Gas is used to simulate the "hydraulic" fluctuation process. By comparing and analyzing the two results, it is determined that the disturbance pressure is between 0.06 MPa and 0.09 MPa. The method of variable control is used to simulate the influence of flow rate, pipe network pressure and pipe diameter on the fluctuation under different variable conditions, to analyze the influence of "hydraulic" fluctuation on the system, and to give corresponding measures to mitigate fluctuations.