Speed of Sound Vortex Would Boost Engine Efficiency by 5-10%

Princeton Plasma Physics Laboratory (PPPL) have patented a novel design for rapidly spinning the gas in combustion engines to boost efficiency by 5-10%.

The ability to absorb energy while being heated of an ideal spinning gas is greater than that of a stationary one. A gas rotating at roughly the speed of sound, when used in a thermodynamic cycle, could allow engines to operate at lower temperature more efficiently than conventional internal combustion engines.

The invention uses an eight-cycle engine, rather than a four-cycle engine, in order to spin the gas at the right points in the cycle