Overcoming the present problems associated with production cost, on-board storage and irregular combustion; hydrogen will be the prime candidate as a fuel for internal combustion engines because of its renewable nature and low pollution emission characteristics. The techniques used for the preparation of combustible hydrogen-air mixture, strongly effects the combustion performance and the pollutant emissions of the engine. The mixture formation techniques also effect the hydrogen engine problems associated with backfire and pre-ignition, which limit its operation capabilities. This reviw of various external and internal mixture formation methods, provides a comparison of different approaches which make the use of hydrogen possible as a fuel for internal combustion engines.
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