Abstract
This paper presents the results of a 3D numerical investigation carried out on a Saccardo ventilation system operating in road tunnel, with the aim to improve the Performance of the Ventilation System, Pvs. 1D mathematical model, here presented, has highlighted that the pitch angle and length of inflow opening are the main parameters that influence the Pvs. The results have shown that the pitch angle of the Saccardo nozzle, influences moderately the Pvs, instead the opening inflow lengths influence considerably the transferring of the momentum, increasing the mass flow rate. Pvs trend vs opening inflow length shows an improvement up to 47% with respect to the reference opening inflow length.
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