Analyse On Flow Characteristic Of Key Basic Unit In Ventilation Network Of The Underground Excavation Cluster Of Hydropower Station

The hydropower station has occupied the very important position in improving Chinese energy sources construction, and with the increase of the size of the hydropower plant, its ventilation and air conditioning systems will be more complex. Network simulation that regards the underground excavation cluster of hydropower station as a multiplayer network which is make up of all levels basic network cell studies flow distribution and momentum matching. Some basic network cells need be researched deeply and wholly during establishing network model.This paper studies some basic network cells during establishing ventilation and air conditioning systems network model of the underground excavation cluster of hydropower station by the way of CFD numerical simulation combined with model experiment.The paper analyses CFD commercial soft in-depth, puts forward some problems when CFD commercial softs are used in he underground excavation cluster of hydropower station and corresponding resolvent.Ventilation at one end of vault is accustomed used in main workshop of underground hydropower station, the flux uniformity of the outlet influences how the basic network cell model---- blast vault should be established in network simulation. The paper studies the the flux uniformity of the outlet when ventilates at one end of vault in the main workshop of Xiluodu underground hydropower station via the method of numerical simulation CFD, puts forward means which can achieve symmetrical ventilation, validates the CFD results credibility by the way of model experiment afterward. Brings forward the basic network cell model of symmetrical blast vault and asymmetric blast vault.Then studies and analyses airflow in vault of main voltage switchyard hall of Xiluodu hydropower station which is far cry and large numbers of airflow conflux, brings forward concept of"virtual embranchment"and corresponding basic network cell model, regresses calculate expressions of flux uniformity coefficient and impedance of"virtual embranchment"of vault of main voltage switchyard hall of Xiluodu hydropower station. Then puts forward means of solving flux and impedance disproportion of conflux airflow.There are no usable impedance calculate expressions in main electrical wire hall...