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.
Simulation of Two-phase Flow in Inflow Shaft of Deep Tunnel Drainage System Based on VOF Model
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第19期
Page:
132-138
Column:
Date of publication:
2023-10-01
- Keywords:
- deep tunnel; inflow shaft; model test; VOF model; air-water two?phase flow
- 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.
Last Update:
2023-10-01