How the MoJet® Works The MoJet® works by harnessing five beneficial effects into one aerodynamic device:


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.