Study Of Heat Transfer Performance In Dam Tunnel And Network Nodes Simple Analysis Of Ventilation Tunnel In Jing Hong Hydropower Station

With economy development and people living standard improvement, energy consumption rapidly is increased, fossil energy sources are faced with increasingly serious crisis and challenge, badly influencing economic development and society advancement. For the sake of lessening energy crisis, all countries vigorously advocate and energetically explore new energy source and reproducible energy sources, implementing containable development energy source policy.Hydropower stations belong to renewable energy sources.during 50 years old, more than 50000 hydropower plants have been constructed, including 230 large-scale and medium-sized ones, in addition, some oversize ones are being built or planed. However, hydropower plant ventilation is becoming an obstacle to hydropower plant development. For energy saving and lowering energy consuming, usually make use of tail-race tunnel or dam tunnel to deal with air, then air-condition or ventilation. But, the progress is quite complicated relating to heat and mass transfer and dynamic characteristic.In this thesis, mainly reseach air heat transfer characteristic in dam tunnel. First, construct physical and mathematic model of dam tunnel dealing with air, analyze the process complicacy and carry through hypothesis and simplification necessity. Second, utilize CFD technique to simulate heat transfer process of all kinds of cases in dam tunnel. Third, deduce the mathematical expressions of dam tunnel's heat transfer, a MATLAB program is proposed to calculate analytical solution of all kinds of cases. Fourth, analyze detailedly influencing effect of some factors, such as outdoor air temperature, airflow velocity, tunnel length, runnel cross area. Fifth, analyze and compare simulative, analytic and actual solution, draw a conclusion on heat transfer performance and dehumidification function of dam tunnel, elaborate the general heat transfer law. In short, apply availably heat transfer performance of dam tunnel, not only be good at energy saving and environmental protection, but also initial investment and operation cost, taking on prosperous prospect.Finally, search ventilation of dam tunnel with network nodes analysis method in Jinghong hydropower plant. Put forward elementary concept and principle on nodes > embranchment impedance > ventilation network nodes chart. Put up hypothesis and simplification on ventilation tunnel and draw ventilation network nodes chart in Jinghong hydropower plant. Gain calculation formula of ventilation dam embranchment impedance. Iintroduce basic calculation idea of ventilation network nodes analysis method and numerical solution on circuit wind flux method.