Parametric study of a diesel engine fueled with directly injected methanol and pilot diesel

Parametric study of a diesel engine fueled with directly injected methanol and pilot diesel
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直喷甲醇和引燃柴油柴油机的参数研究

DOI:
10.1016/j.fuel.2019.115882
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发表时间:
2019-11
期刊:
影响因子:
7.4
通讯作者:
Li Changming
Li Changming
中科院分区:
工程技术1区
文献类型:
--
作者:
Li Zhiyong;Wang Yang;Geng Heming;Zhen Xudong;Liu Minjiang;Xu Shuai;Li Changming

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建立了直喷式甲醇柴油机的三维仿真模型,对直喷式甲醇柴油机的燃烧特性进行了仿真研究。选取了甲醇喷嘴直径、甲醇喷射压力和两种柴油/甲醇喷雾间隔角(XZ平面α和XY平面β)4个参数,研究了它们对燃烧特性、发动机性能和排放的影响。结果表明,甲醇喷嘴直径和喷射压力对发动机性能影响较大。当甲醇喷射持续时间保持恒定时,较大的喷嘴直径与较低的喷射压力配对导致较低的Pmax、峰值HRR和NOx排放,但较高的碳烟、THC和CO排放。此外,随着喷嘴直径的增加和喷射压力的降低,燃料经济性首先提高,然后恶化。0.36 mm的喷嘴直径与27.4 MPa的喷射压力配合使用,可获得最佳的燃油经济性和允许的燃烧噪声。当甲醇喷雾喷向火焰方向时(α = 2°,β = 15°),可获得较好的燃油经济性和较低的污染物排放。
A three-dimensional simulation model is established to investigate a diesel engine fueled with directly injected methanol and pilot diesel. Four parameters (methanol nozzle diameter, methanol injection pressure, and two diesel/methanol spray interval angles: α in the XZ plane and β in the XY plane) are selected to study their effects on combustion characteristics, engine performance, and emissions. The results indicate that methanol nozzle diameter and injection pressure have a great effect on the engine. When the methanol injection duration is kept constant, a larger nozzle diameter paired with a lower injection pressure lead to a lower Pmax, peak HRR, and NOxemissions, but higher soot, THC, and CO emissions. Furthermore, as nozzle diameter increases and injection pressure decreases, fuel economy first improves and then deteriorates. A nozzle diameter of 0.36 mm paired with an injection pressure of 27.4 MPa yield optimal results for both fuel economy and allowable combustion noise. When the direction of methanol spray injected towards the flame is tuned (when α is 2° and β is 15°), better fuel economy and lower pollutant emissions are achieved.
柴油甲醇双燃料(DMDF)发动机燃烧和排放特性的数值研究
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