Analysis of Knock Phenomenon and Proposal of the Solution

爆震现象分析及解决方案

• 批准号: 15560170
• 负责人: MORIYOSHI Yasuo
• 金额: $ 2.37万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560170/
• 关键词: Knock phenomenon; Negative temperature coefficient; Spark ignition engine; Rapid compression machine; Local gas temperature measurement

Knock phenomenon was found affected by Negative Temperature Coefficient(NTC), examined by experiments using a constant volume chamber. However, as the conditions such as pressure, fuel, unsteadiness, temperature and turbulence are quite different from production engines, a rapid compression machine, which can simulate the conditions in actual engines, was designed and built. As this machine is based on a machine developed at Kyusyu Univ., it has features such as compact, variable piston-motion profile, moderate vibration. Using this machine, measurements of gas temperature and pressure, visualization, and gas analysis can be achieved. Because the local gas temperature measurement is considered as the most important factor for knock, it was made by using two-wired thermocouples, allowable the measurement even in the vicinity of wall As a result, although the accuracy depends on the flow direction, density, and velocity, measurement was made within 2% error. Meanwhile, 0-dimensional numerical analyses were carried out for data taken with the constant volume chamber. Through this study, useful information for knock analysis was obtained, especially conditions whether knock occurs or not. NTC was found affective, depending on experimental conditions. To avoid knock, reductions in the gas temperature, the duration in high temperature and unbumed fuel at the moment of knock initiation are affective.

通过定容燃烧室的实验研究，发现负温度系数（NTC）对爆震现象有影响。然而，由于压力、燃料、不稳定性、温度和湍流等条件与生产发动机有很大的不同，因此设计并建造了一台能够模拟实际发动机条件的快速压缩机。由于这台机器是基于九州大学开发的机器，它具有结构紧凑、活塞运动轮廓可变、振动适中等特点。使用该机器，可以实现气体温度和压力的测量，可视化和气体分析。由于局部气体温度测量被认为是爆震的最重要因素，因此使用双线热电偶进行测量，即使在壁附近也可以进行测量。因此，尽管精度取决于流动方向，密度和速度，但测量误差在2%以内。同时，对定容室的实验数据进行了0维数值分析。通过研究，获得了爆震分析的有用信息，特别是爆震是否发生的条件。NTC被认为是有效的，这取决于实验条件。为避免爆震，降低燃气温度、缩短高温持续时间和降低爆震发生时的未燃燃料是有效的。

项目成果

二線式熱電対を用いた燃焼室内局所ガス温度測定法の開発

两线热电偶燃烧室局部气体温度测量方法的研制

• 发表时间: 2005
• 期刊: 日本機械学会論文集B 71-701
• 作者: 小林;森吉;榎本
• 通讯作者: 榎本

二線式電対を用いた燃焼室内局所ガス温度測定法の開発

两线耦合燃烧室局部气体温度测量方法的研制

• 发表时间: 2005
• 期刊: 日本機械学会論文集B 71-701
• 作者: 小林;森吉;榎本
• 通讯作者: 榎本

analysis of Auto-Ignition Induced in a Constant Volume Vessel by Local Gas temperature Measurement and Visualization

通过局部气体温度测量和可视化分析定容容器中引起的自燃

• 发表时间: 2004
• 期刊: Proc.of COMODIA2004
• 作者: S.Kobayashi;Y.Moriyoshi
• 通讯作者: Y.Moriyoshi

Design and Development of Rapid Compression Machine and Measurement of Local Gas Temperature

快速压缩机的设计开发及局部气体温度测量

• 发表时间: 2005
• 期刊: Proc.of JSAE Kanto scientific meeting
• 作者: J.Katsuta;Y.Moriyoshi
• 通讯作者: Y.Moriyoshi

急速圧縮装置の試作と燃焼時の局所ガス温度測定

快速压缩装置原型及燃烧过程中局部气体温度测量

• 发表时间: 2005
• 期刊: 自動車技術会関東支部学術研究講演会前刷集
• 作者: 勝田;森吉
• 通讯作者: 森吉