On Iso-octane Combustion with Ozone Addition under HCCI Engine-Like Conditions

Abstract Numerical simulations were carried out to study the influence of ozone on Ignition Delay Time (IDT) iso-octane/air mixtures under typical operating conditions HCCI engines. 0-D and 2-D CFD compute IDT characterize compression, combustion, expansion in an engine, respectively. A kinetic model was developed by merging a mechanism for iso-octane, sub-mechanism nitrogen oxides, ozone. The used investigate iso-octane/air/ozone engines running with very lean (equivalence ratio equal 0.3). Parametric analyses considering different values temperature (500 1200 K), pressure (15 40 bar) concentration (0 50 ppm). results show that as increases decreases, greater impact at low temperatures, NTC (Negative Temperature Coefficient) effect decreases. However, reduction addition is less increases, especially temperatures. An increased pressure, other hand, generally promotes faster decomposition enhances all temperatures except range 760-840 K, where opposite occurs due phenomenon. Finally, when high, i.e. both have little percentage IDT.