公路隧道壁面通風摩阻損失系數研究
[Abstract]:Ventilation is an important prerequisite to ensure the safety of tunnel construction and traffic safety in the later stage of operation. The wall friction loss coefficient is one of the important parameters to reflect the ventilation resistance characteristics of the tunnel, and it is the basis of the design, optimization and technical management of the tunnel ventilation system. At present, the measurement of friction loss coefficient on tunnel wall is not mature, people mainly adopt empirical formula method, field test method, etc., but because of the engineering environment, support mode and section shape of each tunnel, The technical level of the construction unit is different, which leads to the large error between the calculation result and the actual situation, and finally affects the practicability of the tunnel ventilation design, and brings the poor air quality of the construction environment to the tunnel construction and the later operation. Energy waste and many other problems. Based on the basic theory of tunnel ventilation and hydrodynamics, the wall friction loss coefficient of tunnel under different cross section shape and different sectional area is given through the simulation analysis of fluid mechanics software Fluent. From which to find out the relationship and the law. By using Fluent software, the effects of the wall surface on the fluid flow at different height of the rough element, the distance between the different rough elements and the diameter of the section are analyzed, and the wall friction loss coefficient and its law are obtained. Then, based on the ventilation inclined well of Maojingba tunnel and Qinling No.2 tunnel project, the wall friction loss coefficient is obtained by using the measured method, and the three-dimensional numerical simulation analysis is carried out, and the results obtained by the two different methods are compared. Finally, the relevant conclusions are drawn. Through the above analysis and summary, the determination of friction loss coefficient of tunnel wall is further refined and more accurate, thus providing a useful reference for the design and calculation of tunnel ventilation system and the distribution of air volume in the ventilation system.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:U453.5
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