Thermal scale model experiment of main transformer room ventilation in a hydropower station with two dimensional particle image velocimetry

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.