竖井风塔外结构优化及阻力特性研究

Study on the Structure Optimization and Resistance Characteristics of Shaft Tower

依托实际隧道工程,基于数值模拟软件Fluent,采用RNG k-ε湍流模型,对不同竖井外结构下的通风流场、阻力特性进行模拟研究。研究表明:风塔外结构阻力系数越大,所形成的抽吸效应越明显,竖井出流量越大;采用凸台状风塔外结构时,竖井出流量最大,竖井自然通风节能效果最佳;相同风塔结构,外环境风速大于竖井出流速度时,外环境风速不再对竖井出流起到积极作用。

Relying on the actual tunnel engineering,based on the numerical simulation software FLUENT,the RNG k-εturbulence model is used to simulate the flow field and resistance characteristics of different external structure of shaft.The results show that the larger the resistance coefficient of the outer structure of the tower is,the more obvious the chimney effect is and the larger the flow rate of the shaft is.When the external structure of the convex tower is adopted,the shaft outflow is the largest and the natural ventilation energy-saving effect is the best.With the same wind tower structure,when the external environment wind speed is greater than the shaft outflow speed,the external environment wind speed no longer has a positive effect on the shaft outflow.