综合管廊内输水管道泄漏扩散的数值模拟研究

Numerical Simulation of Leakage Diffusion in Water Pipelines In Integrated Pipe Gallery

为了评估管廊内输水泄漏扩散范围并防止综合管廊内输水管道泄漏造成积水,运用计算流体动力学软件Fluent在不同泄漏孔尺寸和不同泄漏初速度下,对综合管廊内输水管道泄漏进行了数值模拟,分析了水泄漏后的压力场、速度场及流线随时间的变化规律,从而阐述管道泄漏扩散的特点.结果表明,小孔泄漏时,压力两侧低,中心高,速度下层高、上层低;大孔泄漏时,扩散作用比较强,分层现象不明显,流速分布相对紊乱;泄漏孔速度越大,在空间内扩散越剧烈,范围越广.

For evaluating diffusion range of water leakage and prevent water accumulationcaused by the leakage of the water pipeline in the integrated gallery,computational fluid dynamics software Fluent was chosen,numerical simulation was carried out on leakage of water pipeline in the integrated gallery under different leakage port sizes and initial velocities.The rule of streamline variation,pressure and velocity field and with time is analyzed,and characteristics of pipeline leakage and diffusion are expounded.The results show that both sides of the pressure are low,center is high,velocity is lower and upper layer is lower when the small hole is leaking.When big hole leakage occurs,the diffusion effect is stronger,layering phenomenon is not obvious,and velocity distribution is relatively disorder.The greater the speed of the leak hole,the greater the diffusion in space,the wider the scope.