Model Experiment And Study On Thermal Properties Of The LangYa-Mountain Hydropower Station's Underground Powerhouses

According to the air ventilation and air conditioning's model experiment of the thermal environment's peculiarity in the underground powerhouses of the LangYa-Mountain hydropower station, this paper make a study about the distribution of temperature and velocity in the main underground working units.The author knows clearly about the developing situation and problems after reading some relative articles about the field of controlling the thermal environment in the underground power plant. And get some important technical basis for its parameter of thermal features based on the experiment about the ventilation model research.This model research is based on similarity theory and use number as similarity number; then make out physical model at the ratio of 1 to 18 and under other referring condition, choose the measuring equipment and set up the accessory equipment.Based on the theory of conducting heat in underground buildings, the author made a research about the number of the model area of self. It is implied that this model is located in the model area of self, and the change of number have no direct effect on the temperature's distribution in the working units.The research is divided into 3 steps:The main purpose of the 1st step is to make out the best ways of distribution of air inlets. There are 5 methods of distribution such as 44, 40, 36, 22, 14 inlets, when the velocity of air ventilation is constant in the 1st step. Under very ways, only temperature and velocity's distribution in the layer are considered; thus I get the best method: 22 inlets, 8 m/s, 540 mm.At the best air parameter, which is confirmed in 1st step, the natural air is send. At the same time, the author alter the extent of discharging or closing, then measure the temperature field and velocity field of every layer in the main underground rooms. After calculation, considering and comparing, the author get the best effect at the best air's velocity and inlets' diameter. The research implies that the effect is better when the wind machine is open than when is closed, and the velocity in the layer of electricity is fit for requests and its distribution is equal.On the basis of 1st and 2nd steps, the author gives cool air in 3rd step. And change the 1# and 2# fans' situations; make a comparison between the effect of fields oftemperature and velocity. We do measuring many times at the same condition and consider carefully about the difference of temperature and velocity. The research proves that when the fans of the layer of hydraulic are set in the two ends it is best. In the two working units the temperature is distributed symmetrically. In the main room of every layers direction and magnitude of velocity is not constant, and its alternation indicates the great random city. The velocity of the area near the inlets of buried pipes in the generatrix layer is stronger. The temperature in generatrix layer is higher than in the worm wheel layer. Thus the author induces the hypostasis form of distribution of no unit temperature difference and applies it to similar layers of water power station. After integrated analysis of the experiment in every step, we make out the best ways of distribution of air inlets, find out the effect of pipes' hided fans, and accomplish to optimize experiment projects and detection of experiment difference under the air conditioning. When we return no unit temperature difference of generator layer's workaround to original temperature, only delivering cool air (13 to 15 Celsius) can fulfill the requests of generator layer's workaround in the strict sense. If we full apply natural air, only add supplying air to fulfill the distribution requests of generator layer's workaround and save energy at the same time.