ZHOUDa-qing,CHENYa-nan,CHENHui-xiang,et al.Simulation of Two-phase Flow in Inflow Shaft of Deep Tunnel Drainage System Based on VOF Model[J].China Water & Wastewater,2023,39(19):132-138.
基于VOF模型的深隧系统入流竖井两相流模拟
- Title:
- Simulation of Two-phase Flow in Inflow Shaft of Deep Tunnel Drainage System Based on VOF Model
- Keywords:
- deep tunnel; inflow shaft; model test; VOF model; air-water two?phase flow
- 摘要:
- 以国内某深隧系统工程的入流竖井为研究对象，应用Realizable k-ε湍流模型对不同工况下竖井段入流全过程进行瞬态模拟计算，并结合物理模型试验，对比不同工况下竖井内流场特征及其消能性能。结果表明，数值模拟与模型试验结果吻合度较高，竖井均是在来流方向一侧的溢流量较大，且在该侧竖井底部的水流紊动较管口侧更剧烈；设计工况下竖井泄流过程中的液相下跌流速最大可达到10 m/s，排气井内气相平均上升速度为2.5 m/s，而排气井外侧的气流因受水流下跌的影响，速度较大，可达5 m/s；竖井内部仅在溢流堰和管道入口上方存在局部负压，且随着流量增大，负压区扩大，最大压差为154 kPa；竖井入流量在不超出工程设计流量时，消能率在73%以上，具有较好的消能效果，但在过载工况下，其消能效果有所降低。
- Abstract:
- This study simulated the entire inflow process in a shaft section of a domestic deep tunnel drainage system project under different working conditions by using the Realizable k-ε turbulence model, and compared the flow field characteristics and energy dissipation performance of the shaft under different working conditions combined with the physical model tests. The results of numerical simulation and model test were in good agreement. The overflow of the shaft was larger on the side of the incoming flow direction, and the turbulence of the water flow at the bottom of the shaft on this side was more intense than that on the inlet side of the pipe. Under the design conditions, the falling velocity of the liquid phase reached the maximum of 10 m/s in the process of shaft discharge, and the average rising velocity of the gas phase in the exhaust well was 2.5 m/s, while the airflow outside the exhaust well had a higher velocity of up to 5 m/s due to the influence of the falling current. Inside the shaft, local negative pressure was only detected above the overflow weir and the inlet of the pipeline, and the negative pressure area expanded with the increase of the flow rate, in which the maximum pressure difference was 154 kPa. When the shaft inflow did not exceed the engineering design flow rate, the energy dissipation rate was above 73%, indicating that a good energy dissipation performance was achieved. However, the energy dissipation performance was reduced under overload conditions.
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