【摘 要】
：
Diesel from Direct Coal Liquefaction (DDCL) and biodiesel both have their own advantages and disadvantages for combustion used in diesel engines. The fuel injection and spray measuring systems have be
【机 构】
：
Shanghai Jiao Tong University, 200240, Shanghai, P. R. China
【出 处】
：
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Diesel from Direct Coal Liquefaction (DDCL) and biodiesel both have their own advantages and disadvantages for combustion used in diesel engines. The fuel injection and spray measuring systems have been set up based on an electronically controlled common rail injection systems on a high pressure pump test bench. The effects of such factors as rail pressure, ambient pressure, energizing pulse width, fuel blending ratio are investigated on the injection and spray process of blends D60 (60%DDCL+40%biodiesel by volume) and D80 (80%DDCL+20%biodiesel). The results show that the injection delays of D60 and D80 are nearly the same and irrelevant with energizing pulse width, but the injection rate of D60 is higher than that of D80, especially with shorter energizing pulse width. The injection duration of D60 is longer than that of D80, and their difference firstly increases and then decreases with energizing pulse width. Cyclic injection mass quantity increases with energizing pulse width, and that of D60 is greater than that of D80. With rail pressure increases, the maximum mass injection rates of the two fuels increases and the increasing rate increases at the initial stage. The difference of mass injection rate between two fuels decreases while the injection delays of both fuels are nearly the same. The initial stage of spray development substantially corresponds to the one of injection rate development. With rail pressure increasing, the spray tip penetration increases though the increasing tendency are not obvious in the initial stage. The sharply changing period of spray cone angle is shorter than that of injection rate and spray tip penetration. The spray cone angle increases with rail pressure and D80 has larger spray cone angle than D60. As ambient pressure increases, the spray tip penetration decreases though the decrement is not obvious in the initial stage, but the spray cone angle increases.
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