REACTION MODELING OF AUTO-IGNITION AND EXHAUST EMISSION IN COMPRESSION-IGNITION COMBUSTION

压燃燃烧中自燃和废气排放的反应模型

• 批准号: 07455099
• 负责人: NISHIWAKI Kazuie
• 金额: $ 3.71万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455099/
• 关键词: Diesel Combustion; Cracking; Compression-Ignition; Reaction Model; High temperature Otidation; Low Temperature Oxidation; Pre-Mixed Compression-Ignition Engine; 圧縮自着火; ディーゼル燃料; 化学反応モデル; すす; 窒素酸化物

Three different types of reaction models have been developed for the compression-ignition process in Diesel engines to be coupled with exhaust emission analyzes.The first model is to describe the high temperature oxidation process from fuel to CO and H_2 with one-step global mechanism of Edelman followed by a detailed kinetics of the oxidation of CO and H_2. In addition to these models, a model for NO formation including prompt NO and thermal NO were taken into account. These reactions were integrated in the stochastic model which expressed the random collisions in turbulent mixing between gas blobs having different temperatures and species concentrations. The computed results compared well with measurements of NO concentration in Diesel exhaust.The second model expresses not only the heat release but also the cracking process which is essential to modeling the soot formation. The model consists of following multi-step global reactions based on the Rice-Herzfeld mechanism and the C_2 hydrocarbon chemistry.C_mH_n*aC_2H_4+bC_4H_9 : n-C_4H_9*C_2H_4+C_2H_5 ; i-C_4H_9*C_3H_6+CH_3The rate constant for the above global reaction was obtaned by comparing with the ignition delay measured in a rapid compression machine. The computed fractions of CH_4, C_2H_4, C_2H_6 and C_3H_6 showed good agreement with measurements.The third model describes the low temperature oxidation mechanism which is needed to analyze a premixed compression-ignition proces. Based on Keck's model, the model has been established by modifying rate constants, activation energies and the mechanism of the termination reaction to fit existing experimental results.The models developed in this study will lead to a more realistic model to combine the high and low temperature mechanisms for the auto-ignition process in the premixed compression-ignition engines being developed for one of the potential future internal combustion engines.

建立了三种不同类型的柴油机压燃过程与排放分析相结合的反应模型：第一种模型用Edelman一步全域机制描述了燃料高温氧化为CO和H_2的过程，然后详细地研究了CO和H_2的氧化动力学。这些反应被集成在随机模型中，该模型描述了不同温度和不同组分浓度的气泡在湍流混合中的随机碰撞。计算结果与柴油机排气中NO浓度的实测值吻合较好。第二个模型不仅描述了燃烧过程中的放热过程，还反映了碳烟生成过程中的裂解过程。该模型由C_2碳氢化合物化学C_mH_n*Ac_2H_4+BC_4H_9：N-C_4H_9*C_2H_4+C_2H_5；I-C_4H_9*C_3H_6+CH_3组成。CH4、C2H4、C2H6和C3H6组分的计算值与实测值吻合较好。第三个模型描述了预混压燃过程的低温氧化机理。在Keck模型的基础上，通过修正速率常数、活化能和终止反应机理来建立模型，以符合现有的实验结果，该模型将为未来潜在的内燃机之一开发的预混式压燃式发动机的自燃过程提供一个更符合实际的模型。

项目成果

Y. YOSHIHARA, K. NISHIWAKI, E. MATSUKAWA: "Modeling of NO Formation and Emission through Turbulent Mixing and Chemical Processes in Piesel Combustion" IPC-8 Technical Paper(Paper No. 9530256). Vol. 1. 145-150 (1995)

Y. YOSHIHARA、K. NISHIWAKI、E. MATSUKAWA：“通过柴油燃烧中的湍流混合和化学过程模拟 NO 的形成和排放”IPC-8 技术论文（论文号 9530256）。

R.Ishikawa, Y.Yoshihara, K.Nishiwaki and J.Inoue: "Numerical Simulation of Knock Initiation in Spark-Ignition Engines" Proceedings of the 13th Internal Combusion Engine Symposium. 559-564 (1996)

R.Ishikawa、Y.Yoshihara、K.Nishiwaki 和 J.Inoue：“火花点火发动机爆震启动的数值模拟”第 13 届内燃机研讨会论文集。

石川隆二,吉原福全,西脇一宇,井上淳: "火花点火機関のノック発生過程の数値シミュレーション" 第13回内燃機関シンポジウム講演論文集. 559-564 (1996)

Ryuji Ishikawa、Fukuzen Yoshihara、Kazuu Nishiwaki、Jun Inoue：“火花点火发动机中爆震发生过程的数值模拟”第 13 届内燃机研讨会论文集 559-564（1996 年）。