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摘要 ：建立了发电机层1∶20通风模型，选用双排和3排共57个圆形送风口、6种送风口组合方案，28，56，112 m3/h 3种风量，4种热源强度，共27种试验工况，试验研究了大空间上送下排机械送排风气流组织分布规律。对主厂房发电机层温度、速度采用量纲一化方法处理，基于不均匀系数和能量利用系数综合评价，推荐采用双排对称圆形风口送风方案。 关键词 ：机械通风，水电站，气流组织，送风口，不均匀系数，能量利用系数 Mechanical ventilation model test with heat sources for main large plant dynamo floor in Hohhot Pumped?storage Underground Hydropower Station By Li Angui★, Zhang Jianfei, Tang Huailin and Wang Jianming Abstract ：Establishing 1∶20 reduced?scale model with heat sources, experimentally investigates the air distribution in large space with mechanical ventilation of up?supply and down?exhaust under 27 kinds of conditions including six inlet combination schemes with double rows and three rows inlets all in total 57 circular air inlets, three different supply air rates of 28 m3/h, 56 m3/h and 112 m3/h, and four sorts of heat source intensity. Adopts the dimensionless temperature and velocity. Based on non?uniform coefficient and energy efficiency coefficient principles, recommends the scheme of double rows of symmetrical circular air inlets. Keywords ：mechanical ventilation, hydropower station, air distribution, air inlet, non?uniform coefficient, energy efficiency coefficient ★Xian University of Architecture and Technology, Xian, China