【摘要】 入流竖井是城市深隧调蓄系统与浅层排水系统衔接的关键部件,竖井内部流场直接影响竖井的消能、控声、排气功能,进而影响深隧系统的正常运转。为此,利用FLUENT软件中的RNG k-ε湍流模型,对跌落式入流竖井内部流场进行了数值模拟,计算了不同竖井体型和不同入口流速工况下竖井内部压力场、速度场的变化规律以及竖井的消能率。结果表明,入口流速的变化对下方渐缩管和消能管下侧的压力影响较大,低流速工况对消能管的压力较大、高流速工况对渐缩管的压力较大,入口流速的增加会导致消能管消能效果的下降;另外,适当增加消能管长度可有效提高消能效果和出水稳定性。更多还原

【Abstract】 The inflow shaft is a key component connecting the urban deep stormwater storage tunnel system with the shallow drainage system. The internal flow field of the shaft directly affects its energy dissipation,noise control and exhaust,which further affects the normal operation of the deep tunnel system. The RNG k-ε turbulence model in FLUENT software was thereby used to simulate the internal flow field of the drop-type inflow shaft,and the pressure field,velocity field and energy dissipation rate of the shaft were calculated under different shaft shape and inlet velocity. The results showed that the change of inlet velocity had a great influence on the pressure of the downward tapered tube and the downside of the energy dissipator. The pressure on the energy dissipator was higher under the condition of low velocity,while the pressure on the downward tapered tube was higher under high velocity. The increase of the inlet velocity would lead to the decrease of the energy dissipation effect. In addition,properly increasing the length of the energy dissipator could effectively improve the energy dissipation effect and the stability of the effluent.更多还原