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This work is an experimental study on the subject of tunnel fires, which is conducted on a ventilated 1/13 scaled tunnel model in the Fluid Mechanics Laboratory, Department of Mechanical Engineering of Middle East Technical University. In order to perform the experiments, in the first stage, the tunnel model was completely renovated, and its overall condition was improved to obtain better means of control and accuracy on the experimental measurements. In the second stage of the thesis, a flow characterizati...