Study On Thermal Properties Of The LongTan Underground Hydropower Station

In the last several decades, be affected by the energy crisis, the water electric power source depends on the cleanliness and its rebirth, which makes many nations of world build hydropower station on a large scale .To make sure the hydroelectric station function normally, we must guarantee that there is a suitable thermal environment in the factory. For LongTan hydroelectric station which is a so large groundwater electric station, because of its complicated structure of underground holes, keeping and controlling the good thermal environment is not easy, so asking for help from the ventilated model to experiment the rationality of designation of ventilation. At the same time, conclusions gained can provide worthy reference for other water power station. We know the actuality of studying thermal environment of hydroelectric station, which mainly concentrates in the main workshop, but study such complicated holes have not yet lead, so study the thermal environment characteristics of whole factory seems greatly important.From the cultural heritage, the theory analysis, to complete three steps of analog test which includes natural ventilation, the mechanical ventilation and arch air-sending of main workshop, this thesis deeply analyse and study the air-flow distribution of two large ventilation system, temperarure distribution law of underground workshop,and temperarure, air velocity distribution law of generator layer of main workshop. Bases on theory analysis, this thesis asks for help from the similarity principle of hydromechanics, applys methods of law analysis and equation analysis, and has the assumptive condition of simulation and original mold's geometry scale, to deduce parameters'simulation scale, which builds theory foundation for experiments of model Natural ventilation experiment gets result with the variety of the number of running units and outdoor temperature to deduce the condition of prototype. It studies both distribution and variety regulation of temperature and ventilation, thereout deduce natural ventilation condition in spring of Longtan underground power station. The main transform chamber system's condition is that the outdoors air temperature don't exceed 19.3℃,but there have no any chance for main workshop. The mechanical ventilation experiment gets the temperature and ventilation distribution in the model by changing the number of running units and keeping a stable ventilation. Reckon the condition of prototype under a design ventilation to study temperature and ventilation distribution in the factory under the mechanical ventilation. Thereout further verify the rationality of ventilated design of prototype and put forward the rational advice of improving its thermal environment. The main factory vault blowing-in experiment is based on the mechanical ventilation experiment in summer. Measure the air speed of vault outlet and both the temperature and air speed of the generator layer's working zone. Reckon and study the temperature and air speed of the generator layer's working zone in prototype, having designed its ventilation, as well as the number and diameter of vault outlets. By that we verify the rationality of vault outlet design. The paper studies and analyses the thermal environment characteristic of Longtan underground power station by 3 stages of model experiment. Get some key conclusions and put forward reasonable suggestions to the design of the prototype ventilation. And the experiment is still incomplete, which should be improved in further experiment.