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摘要： 在试验研究中考察了送风速度和热源发热量对工作区气流组织的影响。试验结果显示，主变室的热源发热量从107 kW增大到178 kW时，气流流场变化不大；送风速度从1.8 m/s增大到3.3 m/s时，气流流场存在较大变化。表明对于有集中热源且采用下送上回气流组织的房间，机械力较热浮升力对气流流场有更大的主导作用。 关键词 ：二维粒子图像测速技术 模型试验 送风速度 热源发热量 Thermal scale model experiment of main transformer room ventilation in a hydropower station with two dimensional particle image velocimetry By Li Angui★，Bao Xin，Qin Erwei and Wang Guodong Abstract Investigates the influence of supply air velocity and heat release rate on air distribution in working area. The results show that the heat release rate exerts a little influence on indoor air distribution and working-area air velocity when it increases from 107 kW to 178 kW, and that the supply air velocity has a remarkable effect on the air distribution when it increases from 1.8 m/s to 3.3 m/s. It indicates that mechanical force has larger effect than thermal buoyancy force in a plant with centralized heat source and down-supply and up-return air distribution. Keywords 2DPIV, model test, supply air velocity, heat release rate ★ Xian University of Architecture and Technology, Xian, China