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首页> 外文期刊>Energy and power engineering >Experimental Investigation of Intake Diesel Aerosol Fuel Homogeneous Charge Compression Ignition (HCCI) Engine Combustion and Emissions
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Experimental Investigation of Intake Diesel Aerosol Fuel Homogeneous Charge Compression Ignition (HCCI) Engine Combustion and Emissions

机译：柴油机气溶胶燃料均质充量压燃（HCCI）发动机燃烧和排放的实验研究

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摘要

External mixture formation (PFI) of a diesel fuel aerosol has employed to investigate the diesel HCCI engine combustion and emissions characteristics. The key to the external mixture formation with diesel fuel is the proper fuel/air mixture preparation. A proposed intake diesel fuel aerosol system mainly consists of a small chamber, in which the diesel fuel is fully vaporized by means of fuel cavitation inside the diesel injector nozzle. Nozzle cavitation is mainly affected by the injection pressure and the fuel system temperature. Results obtained reveal that the proposed method determines the possibility of producing a complete homogeneous fuel/air mixture, which can be applied to the diesel HCCI engine. With this method, the combustion and emission behavior were entirely optimized and the engine is capable of running in HCCI combustion mode with nearly ideal mixture preparation. In the present investigation, a methodology for the HCCI combustion mode of the diesel aerosol/air mixtures based on the fuel cavitation inside the injector nozzle parameters (such as the injection pressure and the fuel system temperature where fuel premixed ratio, NO_x, CO, CO_2, and HC emissions) have analyzed. Based on the engine performance and emissions characteristics the fuel injection pressure and the fuel system temperature have optimized to produce a suitable fuel premixed ratio and the perfect fuel/air mixture homogeneity at different engine operating conditions. The optimal injection pressure ranges between 150 - 200 bars, while the fuel system temperature lies within 175℃ - 200℃. Loops of exhaust gas recirculation (EGR) are used to extend the engine load by controlling the combustion phasing.
机译：柴油机气溶胶的外部混合物形成（PFI）已用于研究柴油HCCI发动机的燃烧和排放特性。与柴油形成外部混合物的关键是正确的燃料/空气混合物制备。提出的进气柴油燃料气雾剂系统主要由一个小腔室组成，在该小腔室中，柴油燃料通过柴油喷射器喷嘴内的空化作用而被完全汽化。喷嘴的气穴现象主要受喷射压力和燃油系统温度的影响。获得的结果表明，所提出的方法确定了产生完全均质的燃料/空气混合物的可能性，可以将其应用于柴油HCCI发动机。通过这种方法，燃烧和排放行为得到了完全优化，并且发动机能够在HCCI燃烧模式下运行，并且制备了几乎理想的混合物。在本研究中，基于喷油嘴参数（例如喷射压力和燃料系统温度，其中燃料预混比，NO_x，CO，CO_2）的燃料气蚀作用，一种用于柴油气溶胶/空气混合物的HCCI燃烧模式的方法以及HC排放量）进行了分析。根据发动机的性能和排放特性，对燃油喷射压力和燃油系统温度进行了优化，以在不同的发动机工况下产生合适的燃油预混合比和理想的燃油/空气混合物均匀性。最佳喷射压力范围在150-200 bar之间，而燃油系统温度在175℃-200℃范围内。排气再循环（EGR）回路用于通过控制燃烧定相来扩展发动机负荷。

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