Abstract: According to the theory of selfexcited oscillation pulsed jet and the wall friction reduction, vibration,diameter changes pipe and natural gas increasing device flow was simulated and analyzed. The results show that, when natural gas flow through increasing device,the pressure fluctuate in collision, radial circulation cause wall there radial vibration. Compared with ordinary diameter changes pipe,the pressure has significantly reduced then entrance exit. Turbulent kinetic energy vary considerably. In the same conditions, the pressure is reduced and pipe gas transmission is increased significantly.

Key words: Natural gas,    ,  Natural gas increasing device, n ,  Numerical simulation

摘要： 根据自激振荡脉冲射流理论与壁面振动减阻理论,对变径管及天然气增输器管道内天然气流动情况进行了数值模拟及分析。结果表明,天然气流经增输器时,在碰撞壁处压力波动较大,存在径向环流,引起壁面的径向振动;与普通变径管相比,增输器出口处的压强与入口相比有明显的降低,湍动能变化较大。在相同工况条件下, 经增输器后压力降低,管道输气量显著增加。

关键词: 天然气 , 增输器 , 数值模拟