G0601-6-1 Combustion Enhancement of Ethanol Spray by Hydrogen Addition

Abstract

In an attempt to investigate the combustion enhancement effects of hydrogen addition on burning of ethanol spray, we observed the combustion characteristics of ethanol spray in hydrogen-air mixtures using a constant volume combustion vessel. The hydrogen volume fraction of 0 - 10% were tested with varying the initial pressure in the range of 0.1 - 0.5 MPa. The peak overpressures and the positive impulses increase with increasing the hydrogen volume fraction, and the pressure profiles become more stable. Also, it was found that the lag between the ignition time and the overpressure peak tend to increase up to a maximum value with increasing the hydrogen volume fraction due to increase of the amount of burnt ethanol, and then decrease. In case of the hydrogen volume fraction of 10 %, the combustion characteristics are almost the same as those of the hydrogen-air mixture. These results imply that appropriate hydrogen addition should be needed for the use of hydrogen as an auxiliary fuel.