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首页> 外文会议>American Society of Mechanical Engineers(ASME) Internal Combustion Engine Division Fall Technical Conference; 20050911-14; Ottawa(CA) >A STAND-ALONE MULTI-ZONE MODEL FOR COMBUSTION IN HCCI ENGINES
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A STAND-ALONE MULTI-ZONE MODEL FOR COMBUSTION IN HCCI ENGINES

机译：HCCI发动机燃烧的单机多区模型

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Because they have the potential for ultra low NOx emissions and high efficiency, Homogeneous Charge Compression Ignition (HCCI) engines have the potential to develop a significant niche. However, a narrow operating range, (bracketed by severe knock and misfire problems), presents a formidable obstacle to developing usable HCCI combustion systems. HCCI combustion is influenced by a complex array of operating variables including fuel octane quality, intake preheating temperature, compression ratio, equivalence ratio, exhaust gas recirculation and engine component temperature. These variables affect the two critical combustion parameters: ignition timing and combustion duration. If these two parameters can be controlled by appropriate settings of the operating variables, a good HCCI combustion scheme could be achieved. Therefore, the theoretical prediction of these two combustion parameters as a function of the key operating variables is necessary for development of HCCI combustion. This paper describes a stand-alone, single-zone and multi-zone combustion model which have been developed for the specific purpose of investigating HCCI combustion control. In the multi-zone model, temperature and composition in each zone were adjusted in order to study the effect of in-homogeneity which is critical to understanding ignition timing and combustion duration in real HCCI engines. The models simulated HCCI combustion using two fuels: hydrogen, (11 species, 23 reactions- from CHEMKIN library), and natural gas, (53 species, 325 reactions- from GRI mech). The capabilities of the two models to predict ignition timing, combustion duration and peak pressure were verified against experimental and simulation results of Fiveland et al [2, 11]. The models were then used to study the effect of different in-homogeneity levels of equivalence ratio, intake temperature and residual fraction. The single zone model could only predict ignition timing while the multi-zone model shows the capability to mimic realistic HCCI combustion phenomena. The study showed that some degree of in-homogeneity is critical to predicting performance of the homogeneous charge compression ignition engine. Further, stratification of equivalence ratio was relatively ineffective at changing combustion while stratification of mixture temperature was very effective. Stratification of the residual fraction proved to be the most promising method of controlling combustion parameters and the mechanism was primarily thermal.
机译：由于它们具有超低NOx排放和高效率的潜力，因此均质充量压缩点火（HCCI）发动机具有发展显着利基市场的潜力。但是，狭窄的工作范围（受到严重的爆震和失火问题困扰）对开发可用的HCCI燃烧系统构成了巨大的障碍。 HCCI燃烧受一系列复杂的操作变量影响，这些操作变量包括燃料辛烷值质量，进气预热温度，压缩比，当量比，废气再循环和发动机部件温度。这些变量影响两个关键的燃烧参数：点火正时和燃烧持续时间。如果可以通过适当设置操作变量来控制这两个参数，则可以实现良好的HCCI燃烧方案。因此，这两个燃烧参数作为关键操作变量的函数的理论预测对于HCCI燃烧的发展是必要的。本文介绍了一个独立的，单区域和多区域燃烧模型，该模型是为研究HCCI燃烧控制而专门开发的。在多区域模型中，调整了每个区域的温度和成分，以研究不均匀性的影响，这对于理解实际HCCI发动机的点火正时和燃烧持续时间至关重要。该模型使用两种燃料模拟HCCI燃烧：氢气（11种，23个反应，来自CHEMKIN库）和天然气（53种，325个反应，来自GRI机械）。两个模型的预测点火正时，燃烧持续时间和峰值压力的能力已根据Fiveland等人的实验和模拟结果进行了验证[2，11]。然后使用该模型研究当量比，进气温度和残留分数的不同同质水平的影响。单区域模型只能预测点火正时，而多区域模型则可以模拟现实的HCCI燃烧现象。研究表明，一定程度的不均匀性对于预测均质充量压缩点火发动机的性能至关重要。此外，当量比分层在改变燃烧方面相对无效，而混合物温度的分层非常有效。残留分数的分层被证明是控制燃烧参数最有前途的方法，其机理主要是热学。

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