Dissertation > Excellent graduate degree dissertation topics show

Numerical Simulation on Construction Ventilation of Single Head Tunnel

Author: LiuZuoChun
Tutor: ChaiJunRui
School: Xi'an University of Technology
Course: Hydraulic Structure Engineering
Keywords: Forced ventilation Concentration of harmful gases Ventilation design Numerical Simulation Concentration
CLC: U453.5
Type: Master's thesis
Year: 2010
Downloads: 250
Quote: 2
Read: Download Dissertation

Abstract


Of tunnel construction ventilation is not optimistic. With increasing speeds and the length of the tunnel boring construction ventilation has become the Rapid Construction of the \Both from the the construction safety point of view, or from the point of view of construction progress and construction economy grew tunnel on heading the construction of ventilation scattered smoke are placed in front of the engineering design, construction and management personnel a very important issue. Combination the Yalong River Lianghekou Highway # 1 tunnel, forced ventilation conditions on heading tunnel basic theoretical calculations and numerical analysis, the main findings and conclusions are as follows: 1) summarizes the ventilation of the tunnel construction at this stage The main applications of several ventilation tunnel longitudinal ventilation air volume theory, and ventilation in all aspects of the arrangement. On heading characteristics of the the two estuaries road tunnel, combined summary of the theoretical calculation of the required air volume, at the same time more systematic exposition of the day-to-day management and maintenance of the ventilation system of measures and safety measures. 2) on heading tunnels, tunneling distance longer the greater the difficulty of construction ventilation. Pressure for the entire single head of tunnel into the ventilation conditions, the flow field and the concentration of pollutants in the tunnel numerical analysis, numerical analysis as part of the tunnel safe construction provides a reasonable theoretical basis changed in the past empirically Construction Ventilation a rough estimate of the time range to avoid the interference of the construction uncertainties, to ensure normal production safety, improve labor productivity, and promote the efficient construction progress has practical significance. 3) large-scale finite element software ADINA spread of numerical simulation of the boring tunnel three-dimensional space Merry structure and concentration of harmful gases. On heading tunnel forced ventilation belongs to the The limited wall jet, near the tunnel face Merry formation of the jet region, the recirculation zone and turbulent three intervals. The simulation results show that, due to the influence of the eddy currents on the concentration diffusion, the vortex center of a high concentration of harmful gases, eddy diffusion retentate effect. With ventilation time, the concentration of harmful gases in the working range negative index changes, and has been verified by the formula. 4) In order to speed up the tunnel on heading to pressure the rate of reduction of harmful gases into the ventilation conditions, the placement of the jet fan, fan spacing numerical simulation. Calculation results show that the forced ventilation conditions, a central location in the recirculation zone of the tunnel jet fan placed to significantly speed up the rate of reduction of harmful gases; jet fans working distance of about 120m, placed in the tunnel jet fan can use this data as a reference, to reduce blindness in the installation process.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Study on Dust Concertiation Measurement Technique Based on Optical Back-Scattering,X831
  6. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  7. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  8. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  9. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  10. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  11. Numerical Simulation of Biomass Direct Reburning,TK16
  12. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  13. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  14. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  15. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  16. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  17. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  18. Methane Concentration Detecting Instrument Based on Infrared Absorption Theory,TP216
  19. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  20. Effects of Light, Temperature and Nitrogen on the Growth of Three Kinds of Aquatic Plants,Q945
  21. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3

CLC: > Transportation > Road transport > Tunnel project > Tunnel buildings and equipment > Ventilation, ventilation equipment
© 2012 www.DissertationTopic.Net  Mobile