Abstract
Polycyclic aromatic hydrocarbon (PAH) and ion formation in the preflame induction process were investigated using a laminar, diethyl-ether/air, low-temperature, flat stabilized burner, operated with an equivalence ratio of 3.0 under an atmoshphereicpressure. Single-ring aromatics and PAHs ranging from two- to four-fused aromatic rings and unsaturated aliphatic hydrocarbons were measured by liquid- and gas-chromatography. The ion current through an ionization gap has also been measured. Most PAHs and single-ring aromatics were found after the cool flame has degenerated, whereas phenol, acetylene and ion current could be detected at the time when a cool flame appeared. In the blue flames, these species increased markedly as compared to the cool flame period.
Keywords
Diesel Engine, Ignition, Oxygenated Fuel/ Polycyclic Aromatic Hydrocarbons, Ion Current