Model Installation Design And Study On Ventilation Experiment Of Lang Ya Shan Hydroelectric Power Station's Underground Houses

This paper make out 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 and checking the related large quantity technology references and engineering analysis firstly. Up to the present, the model experiment is still important means of air distribution study in underground houses. The arrange size of machine electricity equipments of LangYa Shan water power station which will soon built is very compact, and the craft form is also different from the formerly pump water station. So, air distribution study of water station has its particularity and application value. Design the model rightly is a premise of air distribution model test in LangYa Shan water power station. Establish experiment model according to the similarity theories. Adopt Archimedes number Ar as similarity standard, and determine every kind of similarity scale according to geometry scale 1/18 and other limit condition. Complete organization of model essence, simulation heat source system, design and arrangement of air supply and exhaust system according to every kind of similarity scale. Also complete the design of experiment examination system and experiment the device's test with model at the same time.Adopt arch crest as air supply system, arrangement vents symmetry, and select 5 kinds of vents to arrange the project, according to the experiment request and factory premises construction form. Take four typical models as jet section, and measure the air temperature and air velocity of the given section and workaround respectively, and make out the current of air distribution in house space. Because of different heat in every jet section, the distribution of temperature and velocity is also different, and intend to match the linear formula of its dimensionless temperature difference and dimensionless velocity respectively. Although the relation of dimensionless temperature difference, dimensionless velocity and dimensionless high is not simple as linear type, within the scope of our investigation to take, their relation can look as a kind of line form.The factors affecting the generator layer's current air distribution are mainly air supply's velocity, vents' diameter, the number of vents, etc., during adoption arch crest to supply air. The air rate of this model experiment is constant, if vents diameter andvents number are certain, the velocity of vents also immediately is determined. The air velocity of arch crest has little influence on mean velocity of workaround. The number of vents is significant to increase or decrease, which will affect the average velocity of workaround. Define the limited coefficient R of airflow; take the geometry parameter of houses, the size and number of vents. Dimensionless parameter R, and make out the general regulation of affecting the air distribution (temperature and velocity field) of workaround. When R increases, pick up the collision of supplying air,enhance the transferring of kinetic energy and distribution evenly, increased the wind velocity's even degree of workaround. When the varieties of R range from 0.63 to 1.08, it doesn't affect remarkably on even dimensionless temperature difference and velocity in workaround.