Time-resolved spray, flame, soot quantitative measurement fueling n-butanol and soybean biodiesel in a constant volume chamber under various ambient temperatures

摘要: Abstract The spray, flame natural luminosity and soot quantitative measurement by fueling n-butanol soybean biodiesel were investigated on a constant volume chamber using multi laser diagnostics with high temporal resolution of 15,037 frames per second. ambient temperature ranged from 700 K to 1000 K was applied mimic the diesel in-cylinder environment covering both conventional low combustion conditions. Results demonstrate that transient liquid penetration lengths gradually decrease development injection in burning spray. length is less affected downstream shorter than under similar two fuels also present drastically different dynamics emission characteristics during process. n-Butanol displays higher normalized pressure indicating potential thermal efficiency. can be observed at reacting spray jet near wall region for biodiesel, while main concentrated jet. Compared lower its propagation distribution sensitive temperatures. Ambient confirmed as dominant impact emissions net increases tested elevated temperature. No detected either or 700 K. starts appear regions 800 K whereas do not emerge until 900 K n-butanol. concentration much restricted within even A particular interesting observation time integrated mass B50D50 (50% 50% low-sulfur fuel volume) 20–30% neat temperatures though oxygen content nearly same. formation explained fact fuel-bound effective reducing production viscosity boiling point results more local equivalence-ratio mixing In this regard, suppressing shows stronger reduction capability biodiesel.