燃气管网动态仿真的研究及应用

研究和了解燃气在管道中的流动，是进行燃气管网系统优化和提高管网输运系统安全性的前提和基础。以流体力学三大守恒方程为基础，建立了等温和非等温条件下的燃气管网稳态和动态仿真理论模型。以有限差分法为基础，得到了上述模型的求解方法，并加入了耗散项，提高了求解方法的稳定性。通过增加初始点和延长出口点的方法，简化了模型的求解。通过在北京六环天然气管网中的初步应用，分别得到了与实际值综合相对误差为1.21％和2.62％的压力和流量仿真值，从而验证了模型及求解方法的可靠性。

RESEARCHES AND APPLICATION ON DYNAMIC SIMULATION OF GAS PIPELINE NETWORK

Researches and studies on the gas flow situation in pipeline are the prelude and foundation for gas pipeline network optimization and the improvement of the security performance of gas transmission system. The theoretical dynamic simulation models for stationary flow and transient flow under the isothermal and non-isothermal condition are set up based on the three conservation equations. The solving method of the aforesaid model is acquired on the basis of finite difference method. The stability of the solving method is improved by adding dissipative term and is simplified by increasing original point and prolonging exit point. The preliminary application in the natural gas pipeline network looped Beijing's sixth ring road showed that the relative errors of pressure and flow rate between real value and simulative value were 1.21% and 2.62% respectively, which verified the dependability of the dynamic model and solving method.