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首页> 外文期刊>Journal of Engineering & Applied Sciences >Pressure Distribution, CO and HC Emission on the Equivalence Ratio Variation of Homogeneous Charge Compression Ignition (HCCI) Engine Simulation
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Pressure Distribution, CO and HC Emission on the Equivalence Ratio Variation of Homogeneous Charge Compression Ignition (HCCI) Engine Simulation

机译：均匀电荷压缩点火点（HCCI）发动机模拟等效率比变化的压力分布，CO和HC发射

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HCCI combustion mode is a combination of the modes of Compression Ignition (CI) and Spark Ignition (SI). A very short duration of combustion in HCCI resulted in faster pressure increases than that at the SI engine and even on the Compression Ignition Direct Injection (CIDI) engine. This research was aimed at finding the pressure distribution and CO-HC emission of the engine. They were predicted on two models, i.e., single zone and multi zone models. Multi zone model divides the cylinder into ten different zones and 3 K stratification temperatures. Two reaction mechanisms were implemented, i.e., detail mechanism and reduced mechanism. Thermodynamic equations of the species involving in combustion reaction were presented in polynomial function of specific heat coefficient, enthalpy and entropy within the temperature range. Reaction mechanism was determined based on arhennius coefficient and state equation was presented in multi-fluid ideal gas where the pressure and density of reactant were presented in the summations of pressure and density of species. The rate of progress reaction was defined as the difference between forward rates and reverse rates and the rate of progress species was defined as the summations of all the rate progress species involved in the reaction. Both models were simulated on the crank angles of 1650-1700 referring to the experiments of the other researchers. The simulation was conducted on five variations of equivalence ratio and was carried out using kinetic reactions based software. The results were presented in graphics comparison of experiment and simulation. Pressure distribution of the experimental and the simulation results on single zone model and multi zone model showed the same tendency on the reduced mechanism results in the higher equivalence ratio. The detailed mechanism on a single zone model gave closer results to the experimental one compared with the reduced mechanism. While CO-HC emission of the experiment under reduced mechanism simulation seemed fit quite well on the equivalence ratio of approximately 0.2 they, however, deviated far at higher equivalence ratio because the fuel, theoretically, gets enough air to burn perfectly.
机译：HCCI燃烧模式是压缩点火模式（CI）和火花点火（SI）的组合。 HCCI中的燃烧燃烧持续时间非常短，压力比Si发动机更快，甚至在压缩点火直喷（CIDI）发动机上。该研究旨在找到发动机的压力分布和CO-HC排放。它们是在两个模型中预测的，即单个区域和多区域模型。多区域模型将气缸划分为十个不同的区域和3 k分层温度。实施了两种反应机制，即细节机制和减少机制。涉及燃烧反应的物种的热力学方程在温度范围内的特定热系数，焓和熵的多项式函数中呈现。基于Arhennius系数测定的反应机制，并且状态方程在多流体理想气体中提出，其中反应物的压力和密度呈现在物种的压力和密度的总和中。进度反应速率定义为正向速率和反向率之间的差异，并且进度物种的速率定义为反应中涉及的所有速率进展物种的总和。两种模型在1650-1700的曲柄角度上仿真，指的是其他研究人员的实验。仿真在对等当量比的五个变型进行，并使用基于动力学反应的软件进行。结果以实验和模拟的图形比较呈现。单区域模型和多区域模型的实验和模拟结果的压力分布表明，对减少机构的趋势导致较高的等效率。与减少机制相比，单区域模型上的详细机制更接近实验性。虽然在减少机制模拟下的实验的CO-HC排放似乎非常适合于大约0.2的等效比，但是，由于燃料，理论上，远远偏离较高的等价比，因此从理论上获得足够的空气完全燃烧足够的空气。

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