Effect of equivalence ratio distribution on end-gas autoignition and pressure wave generation process
Knocking simulation in a constant volume reactor was carried out by using the compressible Navier-Stoke equations with a detailed reaction mechanism of n-heptane. In this study, we investigated the influence of equivalence ratio distributions on knocking combustion, assuming multistage injections in an engine cylinder. The result showed, in a condition (Case B in the lower left figure), characteristic two-stage autoignition occurred (lower right figure), leading to the increase of knocking intensity. The study demonstrated the importance of fuel distributions in the knocking phenomenon.
Tomonari Satoh
Hokkaido University
![](https://i0.wp.com/sip.st.keio.ac.jp/wp/wp-content/uploads/2017/10/2b530e80c7d0de90885e285c5d798063-3.jpg)
Details of contents:
Tomonari Satoh, Hiroshi Terashima, “Effects of fuel/air mixture distribution on end-gas autoignition and pressure wave generations in knocking combustion”, 26th International Colloquium on the Dynamics of Explosions and Reactive Systems (2017)
Comment:
The result uniquely provided a two-staged end-gas autoignition phenomenon with a non-uniform fuel/air distribution, resulting in a larger knocking intensity. The study, thus, clearly demonstrated the importance of fuel/air distributions on knocking, while identifying the key physics behind it. Please see our paper.
Hiroshi Terashima Hokkaido University Professor