Experimental and Numerical Analysis of Pressure Gain and Velocity Profile by Inclined Jet Injection in Duct Flow

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In order to know the flow field and pressure gain characteristics with an inclined jet injection into a tunnel duct with rectangular cross section, we have performed a model experiment with a 1/30 scale. A series of experiment gave results on the flow field by the jet, in view of pressure characteristics and velocity profile, depending on the shape of guide vanes. Stress was laid on the experimental cases for the "flat type" vanes, which is considered to be important from practical aspects. The most favorable guide vane type for a 30 degree approaching jet was the one with the flat plate with the length equal to the jet width, and same parallel length. In addition numerical simulation for the model was carried out using a commercial code. Numerical results showed good agreement with the experimental results. As conclusion, we have found the most favorable shape of jet injection nozzle in view of pressure gain and tunnel safety.