IMPROVEMENT OF ALCOHOL ENGINE PERFORMANCE BY FLASH BOILING INJECTION

Abstract

A fuel supply method called boiling has been developed to overcome the problems associated with alcohol fuel use. In flash boiling, a fluid boils when the pressure around it falls below the saturation pressure. By applying this principle, the spray droplet size can be made small, the spray angle large, and the spray travel short to improve thermal efficiency and to reduce exhaust emission of unburnt alcohol. Flash boiling injection can be applied to both spark ignited and diesel engines. The technique has been successfully applied to the unthrottled operation of an open-chamber, spark ignited engine to improve thermal efficiency at partial load.