Reducing the Coanda effect
The discharged jet is turned away from the tunnel surfaces, which significantly reduces the proportion of thrust lost due to aerodynamic friction. The MoJet® achieves this by using an inclined trailing edge, and a bellmouth design which improves the flow conditions at the inlet side, while acting as a deflector on the outlet side.
Static pressure recovery
downstream of the fan (due to an increase in silencer cross-sectional area). This means that more thrust is generated using the static pressure at the outlet (which is a reversible, efficient process) rather than the discharge velocity (an irreversible, inefficient process).
Increased mass flowrate
through the fan (due to reduced inlet and outlet pressure drops). The pressure drops at the inlet and outlet are reduced due to the larger cross-sectional areas compared to conventional jetfans.
Confining effects of the tunnel soffit on the silencer inlet are reduced
because the silencer inlet area is directed away from the tunnel soffit.
Reduced discharge velocity
leading to lower shear stress at the tunnel soffit immediately downstream of the MoJet®.
Airflow from a MoJet into a tunnel, including the swirl effect of the rotating fan blades. Calculated using ANSYS CFX. The MoJet turns the flow away from the tunnel soffit, and the Coanda effect is thereby overcome.