Study On Air Distribution Thermal Properties Of The LangYa-Mountain Hydropower Station's Underground Powerhouses

The arrange size of machine electricity equipments of LangYa Shan water power station which will be soon built is very compact, and the craft form is also different from formerly pump water station. So, it's of particularity and application value to study the air distribution of the station. According to the air ventilation and air conditioning's model experiment of the thermal environment's peculiarity in the underground powerhouses of the LangYa-Mountain hydropower station, this paper presents the research on the distribution of temperature and velocity in the main underground working units.Based on the history, status, development trend and existent problem of ventilation and air condition technology application in underground water power at home and abroad by indexing, this paper summarized the related large quantity technology references and engineering analysis firstly. Up to the present, the model experiment is still of important means on air distribution study in underground houses.With theory analysis, similarity principle and similarity three-laws of hydromechanics, the paper applies methods of law analysis and equation analysis to give an assumptive condition of simulation and original mold's geometry scale, with which to deduce parameters' simulation scale, and builds theory foundation for experiments of model. According to thermal state similitude model experiment of the LangYa mountain hydropower station, we adopt different velocity of air ventilation and exclude air proportion of upriver and downriver , this paper contrast the air distribution of the dynamo floor on each method , and educe the best projects of arch crest supply air that adapt to LangYa mountain hydropower station's dynamo floor : G= 17.4×10~4m~3/h,22 vents,d=600mm, the scale of volume 1:3,t0=16.9℃. It's also thought that improved any side of volume can reduce its temperature.When study on the air supply of LangYa mountain hydropower station's underground dynamo floor by CFD software, it proved that CFD software is correct when compare with model experiment .When arrange the number of 5 kinds of vents, it concluded that the number of vents 14 to 22, it can't change velocity, in 36 to 40 can lead to reduction of velocity .when vent in 14 to 36, the parameter Kt doesn't change, when the number is as large as 36, Kt reduces. If change volume, when the volume is small, temperature reduces as volume .When the volume...