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首页> 外文期刊>SAE International Journal of Engines >Knock in an Ethanol Fueled Spark Ignition Engine: Detection Methods with Cycle-Statistical Analysis and Predictions Using Different Auto-Ignition Models
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Knock in an Ethanol Fueled Spark Ignition Engine: Detection Methods with Cycle-Statistical Analysis and Predictions Using Different Auto-Ignition Models

机译：乙醇燃料火花点火发动机的爆震：具有循环统计分析的检测方法和使用不同自动点火模型的预测

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摘要

Knock is studied in a single cylinder direct injection spark ignition engine with variable intake temperatures at wide open throttle and stoichiometric premixed ethanol-air mixtures. At different speeds and intake temperatures spark angle sweeps have been performed at non-knocking conditions and varying knock intensities. Heat release rates and two zone temperatures are computed for both the mean and single cycle data. The in-cylinder pressure traces are analyzed during knocking combustion and have led to a definition of knocking conditions both for every single cycle as well as the mean engine cycle of a single operating point. The timing for the onset of knock as a function of degree crank angle and the mass fraction burned is determined using the "knocking" heat release and the pressure oscillations typical for knocking combustion. A detailed chemical kinetic model for ethanol combustion is used to compute ignition delay times (IDT) for stoichiometric ethanol-air mixtures at pressures and temperatures relevant to the conditions measured on the engine test bench. A multi-step Arrhenius type correlation has been fit to the data including the observed flattening of the IDT for ethanol at relatively low temperatures (<850K) and compared to other data available in literature. Empirical knock prediction models available in literature are tested against the available measurement data and improvements to the models are formulated. The importance of accurate IDT values as well as a model for the reducing probability of knock towards the end of combustion for the precision of a knock model is illustrated.
机译：在单缸直喷火花点火发动机中研究了爆震，该发动机具有在全开节气门和化学计量的乙醇空气混合气时可变的进气温度。在非爆震条件下和不同的爆震强度下，以不同的速度和进气温度进行了火花角扫掠。计算均值和单周期数据的放热速率和两个区域温度。在爆震过程中分析了缸内压力曲线，并得出了每个单个循环以及单个工作点的平均发动机循环的爆震条件的定义。爆震开始的时间与曲轴转角和燃烧的质量分数的关系，可通过“爆震”放热和典型的爆震燃烧压力波动来确定。乙醇燃烧的详细化学动力学模型用于计算在与发动机试验台上测得的条件相关的压力和温度下，化学计量的乙醇-空气混合物的点火延迟时间（IDT）。多步Arrhenius类型相关性已适合数据，包括在相对较低的温度（<850K）下观察到的IDT对乙醇的平坦度，并与文献中的其他数据进行了比较。针对可用的测量数据对文献中可用的经验爆震预测模型进行了测试，并对模型进行了改进。说明了准确的IDT值的重要性以及对于爆震模型的精度而言，用于降低朝向燃烧结束的爆震概率的模型的重要性。

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