Experimental Analysis On The Air Distribution Of Powerhouse Of Hohhot Hydropower Station With 2D-PIV In Summer Conditions

Powerhouse of the hydropower station is a large space. There are many complicated heating facilities and equipment in the powerhouse, such as electricity generators, transformer etc. In order to make equipment and staffs to work normally, ventilation is used to make sure that the temperature, relative humidity and the concentration of harmful gases are in the permitted range. In this paper Hohhot hydropower station was taken for example and PIV (particle image velocimetry) was used for first time to study the air distribution of the powerhouse.In this paper the model size was 1/50 of the real scale and the complicated heating facilities was simplified in the model. PIV was used to study the air distribution in the model of the powerhouse.The air distribution of the four typical sections (Two cross-sections:one was below the inlet and another was on the top of heat source. Two longitudinal sections: one was on the top of heat source and another was in the center of the mode.) and occupant-zone temperature field were texted in experiment. In the paper different supply air conditions and heat release rates were discussed. Three air supply were discussed: v/v₀ =0.75,v/v₀=1 and v/v₀=1.25 (v₀ is designed air supply speed of model, v₀ =0.94 m/s)and the changes of the air distribution, air speed, occupant-zone air speed, occupant-zone air speed consistency and occupant-zone temperature were discussed with air supply increasing. We also carried out three heat release rates: Q/Q₀= 0.75, Q/Q₀=1 and Q/Q₀=1.25 (Q₀ is designed heat release rate of model, Q₀ = 7.12W)and the changes of the air distribution, air speed, occupant-zone air speed, occupant-zone air speed consistency and occupant-zone temperature were discussed with heat release rate increasing. The experimental findings are use0ful for optimizing the design of air distribution in powerhouse with complex heat sources.In addition, PIV technology has been applied to many fields, however it is difficult to master. In this paper there was some experience to share for users.