Hydrogen is a versatile fuel with the unique potential of providing an ultimate freedomfroman energy (fuel) crisis and
environmental degradation. This paper describes some aspects of a series of experimental studies carried out in several
con.gurations of hydrogen-operated engine, keeping in view the possibility of introducing hydrogen engine into the existing
energy infrastructure. Optimum performance and low-emission characteristics have been experimentally identi.ed and steps
have been identi.ed to get rid of undesirable combustion phenomena such as back.re, pre-ignition, knocking and rapid rate
of pressure rise.
As far as the introduction of hydrogen engine into the transportation sector is concerned, fuel-induction technique forms
the most important aspect of development. Our studies show that timed manifold injection (TMI) has the potential of being
the most appropriate fuelling strategy. A TMI-operated engine does not need any substantial modi.cation in the existing
system hardware and ensures high thermal e3ciency and low speci.c fuel consumption without any symptoms of undesirable
combustion. Experimental investigations carried out with a typical multi-cylinder automotive engine adopting exhaust gas
recirculation (EGR) indicate that the NOx emission level can be drastically reduced over a wide range of operating conditions.
Considering the prospects of introducing hydrogen engine into the agricultural sector or a decentralized energy units, this
paper also deals with the performance improvement achieved by way of hydrogen substitution in a small horsepower diesel
engine widely adopted in rural=agricultural sector of developing countries. It has been experimentally observed that the range
of smooth engine operation can be increased and the level of energy contribution in such systems can be substantially enhanced
by adopting a charge dilution technique.