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首页> 外文期刊>SAE International Journal of Engines >A Multi-Dimensional CFD-Chemical Kinetics Approach in Detection and Reduction of Knocking Combustion in Diesel-Natural Gas Dual-Fuel Engines Using Local Heat Release Analysis
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A Multi-Dimensional CFD-Chemical Kinetics Approach in Detection and Reduction of Knocking Combustion in Diesel-Natural Gas Dual-Fuel Engines Using Local Heat Release Analysis

机译：局部热释放分析用于检测和减少柴油-天然气双燃料发动机爆燃的多维CFD-化学动力学方法

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摘要

Dual-fuel diesel-natural gas (NG) engine exhibits higher power density and lower specific emissions compared to dedicated diesel engines. However, high intake temperatures, high compression ratios, combined with high engine loads may lead to engine knock. This is potentially a limiting factor on engine downsizing and getting higher power. In the present study, the combustion process under knocking conditions has been investigated in a dual-fuel diesel-NG engine. A comprehensive multi-dimensional simulation framework was generated by integrating the CHEMKIN chemistry solver into the KIVA-3V code. A detailed chemical kinetics mechanism was used for n-heptane and methane as diesel and NG surrogates. Combination of detailed chemical kinetics and detailed fluid dynamics calculation enabled the model to take into account the characteristics of most pronounced knock type in dual-fuel engines, so called end-gas knock. Within the CFD computational domain, eight regions that are the representatives of the dual-fuel heat release patterns have been selected to extract local properties. Using local knock identification factors, end-gas knock was observed in abnormal combustion cases. A new Knock Intensity factor (K.I) was introduced based on local heat release rate. Using developed knock prediction method, results showed knock could be mitigated by using EGR. Moreover, effect of premixed methane equivalence ratio on knocking combustion was investigated.
机译：与专用柴油发动机相比，双燃料柴油-天然气（NG）发动机具有更高的功率密度和更低的比排放。但是，高进气温度，高压缩比以及高发动机负荷可能会导致发动机爆震。这可能是限制发动机尺寸并获得更高功率的限制因素。在本研究中，已经研究了双燃料柴油-NG发动机在爆震条件下的燃烧过程。通过将CHEMKIN化学求解器集成到KIVA-3V代码中，生成了一个全面的多维仿真框架。详细的化学动力学机理被用作正庚烷和甲烷的柴油和天然气替代物。详细的化学动力学和详细的流体动力学计算相结合，使模型能够考虑双燃料发动机中最明显的爆震类型的特性，即所谓的尾气爆震。在CFD计算域内，已选择了代表双燃料放热模式的八个区域来提取局部属性。使用局部爆震识别因素，在异常燃烧情况下观察到了最终气体爆震。根据局部放热率引入了新的爆震强度因子（K.I）。使用发达的爆震预测方法，结果表明爆震可以通过使用EGR减轻。此外，研究了预混甲烷当量比对爆燃的影响。

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