Study on the Jet Flow Ventilation Pressurization Technology

Up to now, more and more highway and railway tunnels generally use the jet flow type longitudinal system, Although the jet flow ventilation system has many merits, its ventilation efficiency to be low, is only generally about 15%. In order to enhance the ventilation efficiency, may use the heavy-caliber air blower, the high injection velocity, arrange the jet fans reasonably and so on. This article uses a method, which establishes shrinkage pipe at the jet flow outlet, so as to enhance the jet fans outlet injection velocity. Through theoretical analysis and calculation. Indicated this method can enable the jet flow turbo-charged to have the remarkable improvement, hence the jet flow ventilation efficiency also has a great scope of enhancement.