Hydrogen Fueled Rotary Engine

Hydrogen Fueled Rotary Engine

ABSTRACT:

We are aware that in early future the world will suffer from the shortage of conventional fuels. Pollution from these conventional fuels is causing the global warming, ozone depletion this makes it essential to search the renewable, pollution free alternative fuel. Hydrogen seems to be most promising alternative fuel.

Hydrogen when burns produce clean energy. Hydrogen can be produce easily. Hydrogen is lightest fuel and richest in energy per unit mass (120 700 kJ/kg). Petrol vapor creeps along the ground while Hydrogen goes up in the air so it is relatively safe. Hydrogen can be stored as compressed gas, liquid or by chemical bonding (i.e. Metal Hydride). Some alloys stores Hydrogen at a higher density than pure Hydrogen even higher than the liquid Hydrogen.

Hydrogen, like petrol, diesel and natural gas, burns well in internal combustion engines. However, in Reciprocating engine during the suction stroke if the Hydrogen is expose to the red-hot particle or spark plug and pre-ignition takes place then it can burst entire fuel tank.

Solution to these problems is to use the Hydrogen in the Wankel rotary engine, which has advantages like high power to weight ratio, extended power stroke, and lesser moving parts. Rotor directly opens and closes ports, so correct timing of intake and exhaust is maintain even at high speed with flat torque curve. Vibration is very low because perfect balancing is possible. Cooler combustion means fewer oxides of nitrogen. Separation of combustion region from intake region is good for Hydrogen fuel.

Mazda began a two years trial period for its experimental low-pollution Hydrogen rotary engine vehicle in 1995. The Cappella Cargo van model vehicle will burn a Hydrogen fuel and will not emit carbon dioxide. Mazda lent the vehicle to the Hirohata Steel Mill for use as their company van and drove it for at least 20,000 kilometers on public roads. Hydrogen was stored as metal hydride.

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