Thermal Model Experimental Reaserch On Ventilation Of Bus Corridor And Main Transformer Room Of Hohhot Hydropower Station With 2D-PIV

Ventilation of Hydropower Station's underground caverns is Ventilation of underground large space.In this paper,based on similarity theory,Archimedes number Ar used for similar standards number,1:50 models are established.Particle image velocimetry technique is applied to model experimental reaserch of bus corridor and main transformer room of Hohhot Pumped Storage Power Station.There is a total of nine test conditions that contain three kinds of supply air flow rate(0.75Go,Go,1.25 Go)and heat release rate of heat source(0.75Q₀,Q₀,1.25Q₀).All main work and research show as follow:1.It is studied about variation disciplines of the flow field of bus corridor with variation of air flow rate and heat release rate of heat source;The experimental results show that when Archimedes number Ar_Q increasing,airflow distance attached with the floor of bus corridor is increasing,so that indoor comfort zone have more larger aera..2.In nine kinds of test conditions,the air average velocity of occupant zone is between 0.1-0.2m/s;It is found that with the increasement of air flow rate and heat release rate of heat source,the air average velocity and uniformity of the air velocity of occupant zone is increasing;Temperature of bus corridor increase gradually from inlet to outlet,temperature gradient vary from 2 to 5℃.Decrescence of supply air flow rate is helpful to improve the uniformity of temperature distribution;Variation of heat release rate of heat source has a little influence on the air average temperature and uniformity of the air temperature of occupant zone.Case 5 has the biggest energy utilization coefficientsηin all cases,so it is the mos teconomical, 3.In main transformer room,relative to the influence of heat release rate of heat source,supply air flow rate has greater influence on the whole flow field of the airflow velocity distribution;The average air velocity at inlet side is between 0.1-0.5m/s,The average air velocity at outlet side is between 0.1-0.5m/s;supply air flow rate and heat release rate of heat source has a little influence on the air average velocity of the main transformer room occupant zone;and the change of drying-rate of the size of of greater influence,The room was the main transformer high the average working space for two parts:the exponential inlet side of,speed in the working plan about 0.1-0.5 m/s between change,Air inlet side inlet side average speed is low,the scheme work at about 0.05-0.15 winds change between m/s.Temperature vary from 2.5℃-3.5℃,exhaust temperature were less than 26℃.4.In GIS room,The average air velocity at inlet side is between 0.05-0.2m/s,The average air velocity at outlet side is between 0.07-0.4m/s;Temperature vary from 2.5℃-3.5℃.Relative to the influence of heat release rate of heat source,supply air flow rate has greater influence on temperature occupant zone of GIS room.5.Pipe-floor's supply air flow from inlet to outlet directly,the entire flow field does not have a clear vortex.the largest flow rate of occupant zone appear just above the heat source;At height of occupant zone,the maximum air velocity appear at the middle 1/3 width of the cross section,the minimum air velocity appear at the inlet side 1/3 width,air velocity of outlet is between them;average air velocity of occupant zone is between 0.05-0.2m/s;In all experiment,temperature gradient is less than 1℃.