抽蓄电站压水气系统排气压水工况下气罐热力学特征与形状优化模拟研究

Numerical Study on Thermodynamic Change of Internal Airflow Influenced by Different Air Tank Shapes in Pump-storage Power Station Air Supply System

以抽蓄机组的压水气系统作为研究对象,开展包含自然对流和壁面传热因素的全通道非稳态三维数值模拟,重点研究排气压水工况下,压水气系统储气罐内部压缩空气的流动分布特征和热力学变化过程。结合数值模拟结果,分析了储气罐出口处流动特征与温度剧烈变化的联系,以及自然对流对气罐热力学进程的改变方式;并进一步探讨了改变储气罐形状及气罐出口管路布置方式对改变储气罐热力学性能的具体影响。为压水气系统压缩空气储气罐热力学性能的优化设计提供了参考。

This paper elaborates the research of the air supply system of the pumped storage power station with the transient full-channel simulation, which considered the influence from internal air convection and external wall heat transfer. This research focuses on the air flow development and the thermodynamic change inside the air tank when it releases air into the supply system. Combined with numerical simulation, the relation between the flow characteristics and the severe temperature drop near the air tank exit was analyzed, and the thermal process change caused by the internal air convection was also discussed. In order to improve the thermal performance of the air tank in air supply system, some structural optimization on tank shape and tube connection were discussed, which can provide some reference for the design of air supply system.