| Jet fan control longitudinal spacing optimization are mainly concentrated in the jet fan is apart from the vaults of the distance, the horizontal distance between the fan and fan export wind speed, etc., according to different temperature field to control the influence of the distance between the longitudinal research is less, therefore, in this paper, based on the actual highway tunnel in different temperature of jet fan are analyzed the influence of the longitudinal spacing control.(1)based on "the code for design of highway tunnel ventilation and lighting "(JTJ026.1-1999) and recommended by the literature method, jet fan outlet wind speed and the tunnel section of temperature, velocity measurement, analysis the main factors affecting the main section of jet flow characteristics. Respectively set up two kinds of working condition of jet fan outlet temperature and tunnel entrance velocity field, temperature field of tunnel model test. Of the solid model, using FLUENT software, the establishment of tunnel is a single set of fan, fan, two groups of different tunnel wall temperature and outlet temperature of the jet fan and tunnel inlet temperature under the condition of velocity field, temperature field numerical simulation, based on the model test results verify the accuracy of the simulation method.(2)Different tunnel entrance distance on the influence of the jet induced length.Jet fan outlet temperature(higher than the same tunnel inside and outside temperature), the results show that the jet fan distance away from the entrance of the tunnel for jet induced length. Tunnel inlet temperature(higher than the same tunnel environment temperature), the results show that the jet fan distance away from the entrance of tunnel is smaller, the greater the effect on jet induced length.(3)Jet fan outlet temperature and the tunnel inlet temperature on the influence of the jet induced length.Jet fan outlet temperature higher than the temperature inside and outside environment, the results show that the jet fan outlet temperature, the higher the jet induced shorter length. Tunnel inlet temperature higher than the tunnel environment temperature, the results show that the tunnel inlet temperature, the higher the jet induced shorter length.(4)Jet fan outlet temperature is the same as the tunnel inlet temperature on the influence of the jet induced length.Jet fan is the same distance away from the entrance of the tunnel, jet fan outlet temperature is the same as the tunnel inlet temperature(higher than the temperature in tunnel), the results show that the jet fan outlet temperature than the tunnel inlet temperature of the jet induced the influence degree of the length(5)Different tunnel wall temperature on the influence of the jet induced length.Outside the tunnel wall temperature is higher than the tunnel environment temperature, the results show that the tunnel wall temperature is higher, jet induced shorter length.(6) Two groups of jet fan to the influence of the jet induced length.Condition 1: a single set of jet fan, condition 2: two groups of jet fan.Jet fan outlet temperature higher than the temperature inside and outside environment, the results show that the jet fan outlet temperature is higher, the working condition of the working conditions than a jet induced shorter length. Tunnel inlet temperature higher than the tunnel environment temperature, the results show that the tunnel inlet temperature is higher, the working condition of the working conditions than a jet induced shorter length. Jet fan outlet temperature is the same as the tunnel inlet temperature(above the tunnel environment temperature), the results show that the jet fan outlet temperature than the tunnel inlet temperature of the jet induced length. |
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