Numerical Simulation Research On Twin Tubes Complementary Ventilation System Of Extra-long Highway Tunnel

With the rapid development of highway tunnels construction, there has being some newfeature and complicated ventilation system in lengthy road tunnels. Based on the key projectssuch as Research for technology of twin tubes complementary network ventilation of longtunnel, this article does detailed research on the twin tubes complementary longitudinalventilation system when the wind volume demand of twin tubes is quite asymmetric.Based on the design theory of twin tubes complementary network ventilation, the paperproposes the specific formulae of location and inter-exchange air volume of twin tubescomplementary ventilation system, uses the technique to design the ventilation system ofDabieshan extra-long highway tunnel, and carries out3-dimensional numerical research onthe twin tubes complementary ventilation system in extra-long highway tunnel. By using oneof the most popular CFD FEM software—CFDesign, the article carries out numericalresearch on the local parts, determines the optimized local structural form, Also the articledose a lot work on the whole ventilation system simulation, analyzes the effects of thelocation of inter-exchange air cross channel、the inter-exchange air volume、the mechanicalpressure and the ratio of air supply and exhaust air on the flow state in the short section. It isconcluded that the article draws some useful conclusions which provide technical guidancefor the later similar engineering design.