Effect of Water Injection Phasing on Combustion Process in ICRC Engine

Abstract:

Working process of an internal combustion Rankine cycle (ICRC) is studied based on bench tests of a prototype engine. A minture of O2 and CO2 is ased used to simulate eshaust gas recirculation(EGR) to control the combastion rate, and effect of injection phase on the combustion and emission characteristics is studied. Results show that water with injection temperature of 160℃ can not only control the reaction rate, but also can expand the area of the P V diagram through vaporization. As a result, the thermo efficiency increases by 6.3%. Injection phase does not affect the thermo efficiency obviously, however, earlier injection timing can increase HC emissions by 40%.