Hydrogen is an attractive energy source for improving gasoline engine performance. In this
paper, a new hydrogen nanobubble gasoline blend is introduced, and the influence of
hydrogen nanobubble on the combustion characteristics of a gasoline engine is experimentally
investigated. The test was performed at a constant engine speed of 2000 rpm, and
engine load of 40, 60, and 80%. The air-to-fuel equivalence ratio (l) was adjusted to the
stoichiometric (l ¼ 1), for both gasoline, and the hydrogen nanobubble gasoline blend. The
results show that the mean diameter and concentration of hydrogen nanobubble in the
gasoline blend are 149 nm and about 11.35 108 particles/ml, respectively. The engine test
results show that the power of a gasoline engine with hydrogen nanobubble gasoline blend
was improved to 4.0% (27.00 kW), in comparison with conventional gasoline (25.96 kW), at
the engine load of 40%. Also, the brake specific fuel consumption (BSFC) was improved,
from 291.10 g/kWh for the conventional gasoline, to 269.48 g/kWh for the hydrogen
nanobubble gasoline blend, at the engine load of 40%.