基于动态仿真和数值模拟的向家坝地下洞室群施工通风方案优化

通风散烟贯穿于地下洞室群开挖施工全过程.金沙江向家坝右岸地下厂房系统结构复杂、规模庞大、通风散烟难度大,为避免采用传统的通风设计方法造成资源浪费、通风效果差等问题,提出了融入系统仿真和数值模拟的通风方案优化模式.该模式不仅能在考虑风量需求的时变性和动态性的基础上合理布置通风系统,还能模拟不同通风方式下的通风流场形态,便于掌控实际通风效果.研究表明该方法能定量分析自然通风效果、风机不同位置的影响等关键问题,为通风方案的优化设计提供理论依据和技术支持.

Optimization of Construction Ventilation Scheme for Large-scale Underground Cavern Group of Xiangjiaba Hydropower Station Based on Numerical Simulation

The ventilation of Xiangjiaba underground powerhouse is very difficult, and the traditional ventilation design maybe result in poor effect and resource waste. In order to resolve these problems, the optimization model of ventilation scheme was proposed based on dynamic simulation and numerical simulation. By this model, the variability and the dynamic characteristic of needed wind quantity can be considered and the flow field can be simulated. The results showed that this method can provide the theoretic proof and technical support for the ventilation design.