Combustion and soot emission characteristics of soybean biodiesel in constant volume chamber

An optically accessible constant volume chamber was adopted to investigate the combustion and soot emission characteristics of soybean biodiesel under 800, 900, 1000, and 1200 K initial ambient temperatures. Results showed that with the decrease of initial ambient temperature ignition delay prolonged and heat release rate transited from mixing controlled combustion to pre-mixed dominate combustion mode. As the initial temperature decreased, natural flame luminosity gradually decayed, which indicated lower soot emission at lower initial ambient temperature.