Abstract
Polyoxymethylene dimethyl ethers (PODEs) are an excellent blend for diesel due to their high cetane number, high oxygen content, and low viscosity. Combustion and emission characteristics are investigated based on experimental tests on a turbocharged, in-line 6-cylinder, common rail diesel engine. Results show that combustion starts earlier with PODE blending at low and partial loads. With pilot and main injection, the peak combustion pressures and peak heat release rates of diesel/biodiesel/PODE blend fuels increase due to large amounts of reactive radicals formed in the pilot heat release stage. With an increase in load, a slight decrease in both peak combustion pressure and peak heat release rate is observed. At low loads, the CA10s, CA50s, and CA90s of diesel/biodiesel/PODE blend fuels advance, and both rapid combustion and late combustion phases shorten. At medium and high loads, CA10s advance, CA50s remain unchanged, and CA90s clearly advance. Rapid combustion phases increase very little, whereas th...
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