Ventilation Model Tests With Airflow Organization Optimization On HuHeHaoTe Hydropower Station Underground Main Building: (Closed Holes And Installed Rrelay Fan)

The installed capacity of the huhehaote pumped-storage powerhouse was 120 million kW (four units).The various similar scale was determined according to Archimedes similarity criterion as 1/20 geometric scale and other restrictive conditions. The supply and exhaust system heat source and structure design is established according to various similar scale models. This paper is about ventilation model tests with airflow organization optimization on HuHeHaoTe hydropower station. Hanging objects holes of generator floor and bus floor are closed, and relay fans are installed in hollow wall. In this condition, air distribution of generator floor, and bus floor and hydroturbine floor is tested, and the results are compared with results that hanging objects holes are opened and relay fans are not installed. The results indicate that the former optimized the air distribution in main factory.The whole experiment contain three stages:The first stage: three air flowrate (56m~3/h,112m~3/h,168m~3/h), five cases of different air inlet, definite heat release rate, temperature and air distribution of occupant zone was tested. The results indicate the best vent case is the case 5 (double even symmetrical fixed). Corresponding parameters for the prototype: the supply air flowrate for 10×10~4 m~3 / h, tuyere for 12 (unit 1 # and 2 # 6 units), tuyere diameter for 500mm, the velocity for 11.88 m/s, the velocity of occupant zone for 0.59 m/s. In bus floor and hydroturbine floor, air distribution that hanging objects holes are closed and relay fans are installed is superior to air distribution that hanging objects holes are opened and relay fans are installed. In generator floor, The situation is the opposite. The second stage: In best tuyere case, test codiontions are selected as follw: air flowrate for 112m~3/h., heat release rate was 75 %, 100 %, 125 % of prototype. supply air temperature is 23℃, 26℃, 29℃. In these conditions, in the best air diffuser test under the plan, the area, selected for the original model change heat intensity of heat intensity of and air temperature for 23℃, 26℃, 29℃, The results showed that the variation of air temperature and heat intensity have a little influence on temperature field of generator floor.The third stage: In best tuyere case, test codiontions are selected as follw: three air flow rate (56m~3/h,112m~3/h,168m~3/h). Three typical sections of the generator floor are selected as test sections, and then air velocity and temperature in vertical direction are measured in vertical direction. The temperature and velocity distribution was tested in order to study air distribution of generator floor.This paper may be useful in ventilation design of huhehaote hydropower and similar engineering.