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首页> 外文期刊>Combustion Science and Technology >NUMERICAL MODELING OF SOOT EMISSIONS IN DIESEL SPRAYS BASED ON DETAILED FUEL AND PAH CHEMISTRY
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NUMERICAL MODELING OF SOOT EMISSIONS IN DIESEL SPRAYS BASED ON DETAILED FUEL AND PAH CHEMISTRY

机译：基于详细的燃料和PAH化学成分的柴油机喷雾中烟尘排放的数值模拟

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Numerical modeling of soot formation and oxidation in diesel sprays was conducted using a multistep soot model coupled with reaction mechanisms for fuel oxidation and polyaromatic hydrocarbon (PAH) formation. As new combustion strategies such as low-temperature combustion emerge, the demand for accurate numerical models has also increased to predict the effects of subtle changes in the operating conditions on combustion and exhaust emissions. Accurate prediction of soot emissions from diesel engines remains challenging, particularly for low-temperature combustion conditions with massive exhaust gas recirculation. Soot emissions from the engine are highly sensitive to local temperature and chemical compositions. In this article, an n-heptane mechanism is combined with a detailed PAH mechanism to simulate diesel spray combustion and emissions formation. The mechanisms are validated against experimental data of ignition delays and flame speeds. The overall reaction mechanism consists of 68 species and 145 reactions and is used with a multistep soot model. The multistep soot model is employed to simulate the evolution of soot including inception, surface growth, coagulation, and oxidation. The soot model is validated against experimental results obtained from a constant-volume combustion chamber and a heavy-duty diesel engine. Predicted flame liftoff locations and flame structures agree well with the experimental data. The model was able to predict the characteristics and trends of soot emissions with respect to the level of exhaust gas recirculation. Further analyses of the engine simulation results were conducted for understanding the soot emission characteristics in the engine.
机译：使用多步烟灰模型以及燃料氧化和聚芳烃（PAH）形成的反应机理，对柴油机喷雾中烟灰形成和氧化进行了数值模拟。随着诸如低温燃烧之类的新燃烧策略的出现，对精确数值模型的需求也增加了，以预测工作条件的细微变化对燃烧和废气排放的影响。准确预测柴油发动机的烟尘排放仍然具有挑战性，特别是对于带有大量废气再循环的低温燃烧条件。发动机的烟尘排放对当地温度和化学成分高度敏感。在本文中，正庚烷机理与详细的PAH机理相结合，以模拟柴油机喷雾燃烧和排放物形成。根据点火延迟和火焰速度的实验数据验证了该机制。整个反应机理由68种和145个反应组成，并与多步烟灰模型一起使用。采用多步烟灰模型来模拟烟灰的演变，包括开始，表面生长，凝结和氧化。根据从恒定容积燃烧室和重型柴油机获得的实验结果验证了烟灰模型。预测的火焰剥离位置和火焰结构与实验数据吻合良好。该模型能够预测相对于废气再循环水平的烟尘排放特征和趋势。对发动机仿真结果进行了进一步分析，以了解发动机中的烟尘排放特性。

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