Analysis of spray,combustion and emission performance of biodiesel-diesel-DEC fuel blends
The schlieren method is used to observe the macro spray characteristics of the fuel under the high-pressure common rail system,and the combustion and emission tests of the external characteristics are carried out on the high-pressure common rail diesel engine to analyze the spray,combustion and emission characteristics of the biodiesel-diesel-DEC blend fuel.The fuel mixed with biodiesel and diesel in a volume ratio of 3:7 is referred to as B30,while the fuel mixed with DEC and B30 in a volume ratio of 2:8 is referred to as B30DEC20.The test results show that B30DEC20 fuel atomization effect is improved,the spray shape is symmetrical and full,and the spray cone angle and spray concentration are close to diesel fuel.In the external characteristics,the torque of the engine fueled with B30DEC20 is 27.4 N·m lower than that of a diesel engine,but its thermal efficiency is higher.When the engine speed is 2 400 r/min,the thermal efficiency of the engine fueled with B30DEC20 is 1.5%higher than diesel engine.The oxygen-containing properties of B30DEC20 result in fewer PM and CO emissions,with PM emissions of the engine fueled with B30DEC20 reduces by 65%-85%and THC emissions is lower than diesel engine.Although the NOxemissions of the engine using B30DEC20 are higher than other fuels engine,but the test found that when speed over 2 400 r/min,NOx emissions are lower than those of diesel.
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