The nano air-bubbles mixed into gas oil are used for the energy saving and environmemtal load reduction ofdiesel engine.The nano air-bubbles were mixed into the fuel line continually by a super miniature ejector-type mixer (outer diameter:20mm, length:34mm) which can make nano and micro sizes. After the micro air-bubbles were separated with the nano air-bubbles in a mixing tank, diesel engine perfbrmance test with a common-rail iiijection system was experimented.The results showed that 3% reduction in break means specific fuel consumption, 19t6 rise in charging eMciency and a slight reduction in the density of exhaust smoke etc. These were caused by mixing thenano air-bubbles into gas oil. It is confirmed that the nano air-bubbles had advanced and activated cornbustion by a physical and chemical action.the inlet fbr fuel (hereafter referred to as gas oil) and the right side is the outlet of the gas oil mixed with nano air-bubblesThe mechanism of mixing nano air-bubbles by this mixture device is as fbllows: 1) It ibjects the gas oil pressurized by a pump at a high speed using an ibjection effect or a nozzle, selfprimed air by the Copyright @ 2012 by the Japan Society of Mechanical Engineers -194 -NII-Electionic
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