Abstract
This paper presents some findings obtained by the running tests of the hydrogen-gas oil dual fuel diesel engine.
The experimental work was carried out on the small size, single cylinder, four stroke cycle, pre-combustion chamber diesel engine with the compression ratio of 20: 1.
In this dual fuel engine, the hydrogen was injected into the intake pipe, mixed with the fresh air, compressed and then ignited by the injection of gas oil near the end of compression stroke. The hydrogen-gas oil dual fuel diesel engine ran smoothly as the hydrogen-air equivalence ratio was smaller than the values of 0.2-0.3 depending on the running conditions of the engine.
But, the preignition began to occur when the hydrogen-air equivalence ratio became larger than the values of 0.2-0.3.
The preignition led rough running and poor thermal efficiency of the dual fuel diesel engine.
With the object of controling the preignition, we tried to inject water near the intake valve in the intake pipe and to lower the temperature of the fresh air by the evaporation heat of water. By the water injection into the intake pipe, the hydrogen-gas oil dual fuel diesel engine could run widely in the hydrogen-air equivalence ratio without the abnormal combustion.
