Study On Setting And Effect Ofshaft In Natural Ventilation Of Highway Tunnel

Operation ventilation of highway tunnels has been the key research point for its hugeenergy consumption and operation difficulties. In a highway tunnel ventilation system, naturalpressure can provide power under certain circumstances, which can save operating costs andimprove economic benefits if properly utilized.Firstly, ventilation network graphs of single-shaft and double-shaft are built based onthenetwork graph theory separately, and then solve the network diagram by Sicorski Huntsmanmethod. Compile the NVSRT in VC++language following the above framework and solutionprocess of network ventilation.Secondly, sensitivity analysis of influencing factors to natural ventilation, such as shaftposition and height, tunnel slope and length in longitudinal direction, are taken using theNVSRT.Thirdly, site meteorological data of supporting project are measured to calculate theamount of wind, traffic air pressure, natural pressure, ventilation resistance and fan windpressure of each branch. Power or resistance offered by natural shaft wind are calculated toanalyze the results of energy saving.Lastly, fire condition of example highway tunnels is simulated to study the distributionregulations of temperature field, pressure field and velocity field. Then smoke extractionability of shafts and the influence of natural wind to tunnel ventilation are analyzed to providesome advice for ventilation control in fire scenes.