特高压户内直流场局部送风冷却效果研究

Study on cooling effect of local air supply in UHV indoor DC field

为解决特高压户内直流场散热设备集中,普通整室混合通风方式无法有效降低设备局部位置处温度过高问题,本文提出了在集中发热设备周围采用喷口的局部冷却方式来达到降温的目的。利用CFD软件模拟送风喷口在不同送风角度、温度和速度的情况下,平波电抗器周围的气流环境情况。模拟结果显示:针对重点散热设备进行局部冷却通风的方式可有效缓解直流场内热力分布不均匀,重点散热部位温度过高问题。喷口角度会改变平波电抗器的内外气流组织量,恰当的送风角度能最大程度同时带走散热设备内外热量。改变送风温度,射流扩散趋势大体相同,重点发热设备周围的气流速度呈现整体提升状态。送风温度参数变化对气流组织的影响并不明显,但对温度场的影响至关重要。

The paper proposes the adoption of a local cooling method,which involves spraying cold air at a fixed point around the power equipment in UHV indoor DC field to address the issue of concentrated heat dissipation and ineffective temperature reduction using common whole-room mixed ventilation methods.CFD is used to simulate the air flow environment around the flat wave reactor at different air supply angles,temperatures and speeds.The results show that:Local cooling and ventilation for key heat dissipation equipment can effectively alleviate the problem of uneven heat distribution in DC field and high temperature in key heat dissipation parts.The angle of the nozzle affects the distribution ratio of the air supply of the flat wave reactor.Choosing the appropriate angle can take away the heat generated by equipment.When the air supply temperature is changed,the jet diffusion trend is roughly the same,and the air velocity around the flat wave reactor is increased as a whole.Changing the air supply temperature has no obvious effect on the airflow distribution,but it plays a decisive role in the change of the temperature field.