基于CFD的水电站地下厂房热湿环境模拟研究

Numerical Simulation on the Thermal and Humid Environment of Underground Powerhouse of Hydropower Station Based on CFD

为准确模拟水电站地下厂房通风情况并解决潮湿问题,提出在自然、机械通风情况下基于CFD的热湿环境模拟方法。对某水电站水轮机层进行三维建模、选取RNG k-ε模型进行热湿环境模拟,通过计算温湿度、空气分布特性指数以及能量效率系数等参数,对通风效果进行评价和对比。结果表明,该地下厂房在自然通风时气流分布不均匀且湿度过大,布置除湿机时气流分布均匀且能显著改善湿度指标。综合考虑,除湿机采用交叉布局方式更加具备节能优势。

In order to accurately simulate the ventilation of underground powerhouse of hydropower station and solve the problem of humidity, a thermal and humid environment simulation method based on CFD is proposed for the underground powerhouse under natural and mechanical ventilation conditions. Taking the turbine floor of a power station as the research object, the RNG k-ε model is selected to simulate the thermal and humid environment, and the ventilation effect is evaluated and compared by calculating the temperature and humidity, air distribution characteristic index and energy efficiency coefficient. The results show that the air distribution is uneven and the humidity is too high under natural ventilation, but the air flow can be evenly distributed and the humidity index can be significantly improved when the dehumidifiers are distributed. In terms of energy consumption analysis, the cross layout of dehumidifiers has a better energy-saving advantage.