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首页> 外文会议>2001 Fall Technical Conference of the Asme Internal Combustion Engine Division, 2001, Sep 23-26, 2001, Argonne, Illinois >A STOCHASTIC SIMULATION OF AN HCCI ENGINE USING AN AUTOMATICALLY REDUCED MECHANISM
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A STOCHASTIC SIMULATION OF AN HCCI ENGINE USING AN AUTOMATICALLY REDUCED MECHANISM

机译：HCCI引擎随机自动减少机理的随机模拟

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Homogeneous Charge Compression Ignition (HCCI) Engines are a promising alternative to the existing Spark Ignition Engines and Compression Ignition Engines. In an HCCI engine, the premixed fuel/air mixture ignites when sufficiently high temperature and pressure is reached The entire bulk will auto-ignite at almost the same time because the physical conditions are similar throughout the combustion chamber. Therefore it is a justified assumption to consider the chemical reactions to be the rate-determining step for the ignition process. This gives us the opportunity to formulate a simple zero-dimensional model with detailed chemical kinetics for the calculations of the ignition process. Ignition calculations using this model have predicted a high sensitivity to fluctuations in temperature and fuel compositions. These predictions have later been confirmed by experiments. Partially stirred plug flow reactor (PaSPFR) can be used to conquer the assumption of homogeneity. The assumption is replaced by that of statistical homogeneity and thus statistical fluctuations caused by inhomogeneities can be studied However, the CPU-time needed for this approach is increased considerably and the usage of mechanism reduction becomes evident. In this paper, we demonstrate how a reduced mechanism for natural gas as fuel is derived automatically. The original mechanism by Warnatz (589 reactions, 53 species) is first reduced to a skeletal mechanism (481 reactions, 43 species). By introduction of the quasi steady state assumption, the skeletal mechanism is reduced further to 23 species and 20 global reactions. The accuracy of the final mechanism is demonstrated using the stochastic reactor tool for an HCCI engine.
机译：均质充气压缩点火（HCCI）发动机是现有火花点火发动机和压缩点火发动机的有前途的替代方案。在HCCI发动机中，当达到足够高的温度和压力时，预混合的燃料/空气混合物将点燃。由于整个燃烧室的物理条件相似，因此整个主体几乎同时会自动点燃。因此，将化学反应视为点火过程的速率确定步骤是合理的假设。这使我们有机会建立具有详细化学动力学的简单零维模型，用于点火过程的计算。使用该模型进行的点火计算已预测出对温度和燃料成分波动的高度敏感性。这些预测后来被实验证实。可以使用部分搅拌的活塞流反应器（PaSPFR）来克服均质性的假设。该假设被统计均一性所代替，因此可以研究由非均质性引起的统计波动。但是，该方法所需的CPU时间大大增加，并且减少机制的使用变得明显。在本文中，我们演示了如何自动导出天然气作为燃料的还原机理。 Warnatz的原始机制（589个反应，53种）首先被还原为骨架机制（481个反应，43种）。通过引入准稳态假设，骨骼机制进一步减少到23种和20种全局反应。使用用于HCCI发动机的随机反应堆工具证明了最终机构的准确性。

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