Ignition Process and Flame Lift-Off Characteristics of dimethyl ether (DME) Reacting Spray

Advanced combustion systems that utilize different modes and alternative fuels have significantly improved performance emissions compared to conventional diesel or spark-ignited combustions. As an fuel, dimethyl ether (DME) has been receiving much attention as it runs effectively under low-temperature (LTC) such homogeneous charge compression ignition (HCCI) reactivity control (RCCI). Under compression-ignition (CI), DME can be injected liquid fuel into a hot chamber, resulting in diesel-like spray/combustion characteristic. With its high unique chemical formula, ignites easily but produces almost smokeless combustion. In the current study, spray several conditions of ambient temperature (T amb = 750–1100 K), density ( ρ 14.8–30 kg/m 3 ), oxygen concentration (O 2 15–21%), injection pressure (P inj 75–150 MPa) were studied. The results from both experiments (constant-volume vessel) numerical simulations used develop empirical correlations for lift-off length. Compared diesel, established correlation shows similar Arrhenius-type expression. Sensitivity studies show T P stronger effect on DME's than other parameters. Finally, this study provides simplified conceptual mechanism reacting (high , O ) LTC conditions. paper discusses engine operating strategies using non-conventional with properties.