* Astronomy

Michigan State University researchers  have developed a prototype petrol engine which uses a rotor thats equipped with wave-like grooves that trap and mix oxygen and fuel
The engine has no transmission, crankshaft, pistons, cooling system, fluids, or valves.
Called the Wave Disk Generator, it is hoped that it could decrease tailpipe emissions up to 90% compared to the current petrol-hybrid cars.
The Wave Disk Generator uses 60% of its fuel for propulsion, while standard car engines use just 15%, which means that the new engine is potentially 3.5 times more efficient than a standard internal combustion engine.

Norbert Mueller describes his wave disk generator



Wave rotors (also called pressure wave machines or pressure exchangers) are unsteady-flow devices that utilize shock waves to transfer energy directly between a high-energy fluid to a low-energy fluid, thereby increasing both temperature and pressure of the low-energy fluid.
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