Premixed ignition behavior of C9 fatty acid esters: A motored engine study

Abstract

An experimental study on the premixed ignition behavior of C9 fatty acid esters has been conducted in a motored CFR engine. For each test fuel, the engine compression ratio was gradually increased from the lowest point (4.43) to the point where significant high temperature heat release (HTHR) was observed. The engine exhaust was sampled and analyzed through GC-FID/TCD and GC-MS. Combustion analysis showed that the four C9 fatty acid esters tested in this study exhibited evidently different ignition behavior. The magnitude of low temperature heat release (LTHR) follows the order, ethyl nonanoate > methyl nonanoate ≫ methyl 2-nonenoate > methyl 3-nonenoate. The lower oxidation reactivity for t..