Oscar Patented Noise Prevention at Source (NPaS) Technology
Objective – Noise Reduction
The interaction between the fan and the Outlet Guide Vane (OGV) is the dominant source of broadband noise in turbofan engines, but this can be reduced.
Our patented technology, NPaS, provides the solution. By placing porous material between the high and low-pressure sides of the vanes, we can reduce the fluctuations and associated noise by as much as 7dB in the frequency range to which the human ear is most susceptible. Engines fitted with NPaS will offer manufacturers a real competitive advantage.
An initial study locating porosity at the leading edge reduced turbulence aerofoil interaction noise, particularly in frequency range 1-5kHz, by up to 7dB.
Further work has demonstrated that locating the porosity away from the leading edge reduces the negative impact on aerodynamic performance while maintaining noise reduction. It is likely that effective noise reduction could be achieved by treating only 10% of the vane area.
“Oscar’s patented technology is at the leading edge of academic and industrial research into the mechanisms by which noise is generated from the interaction of high-speed air flows and OGVs/Stators.”
Prof. Philip Joseph, Professor of Engineering Acoustics at the University of Southampton
Oscar Propulsion is seeking collaboration with the next generation of sustainable aviation propulsion technology and is willing to license its patented noise reduction technology and know-how.