Effect of Negative Temperature Coefficient Region on Autoignition Prediction Using Livengood-Wu Integral wit Ignition Delay Time Equations for Normal Hexadecane
ノルマルヘキサデカンの着火遅れ時間総括式を用いたLivengood-Wu積分による自着火予測に負の温度係数域が及ぼす影響
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- Publication code
- 20224164
- Paper/Info type
- JSAE Transaction
Vol.53 No.2
- Pages
- 332-339(Total 8 p)
- Date of publication
- Mar 2022
- Publisher
- JSAE
- Language
- Japanese
Detailed Information
| Category(J) | 研究論文 Translation |
|---|---|
| Category(E) | ResearchPaper |
| Author(J) | 1) 福田 敦士, 2) 森本 尚典, 3) 桑原 一成 |
| Author(E) | 1) Atsushi Fukuda, 2) Takanori Morimoto, 3) Kazunari Kuwahara |
| Affiliation(J) | 1) 大阪工業大学, 2) 大阪工業大学, 3) 大阪工業大学 |
| Abstract(J) | 高精度ノッキング予測モデルの確立のためLivengood-Wu積分による自着火予測の誤差要因を検討してきた．冷炎反応がおよぼす影響を検討するため，ノルマルヘキサデカンの温度・圧力・当量比依存性を再現可能な総括式を構築し，総括式を用いたLivengood-Wu積分による予混合圧縮着火予測を数値的に行う． Translation |
| Abstract(E) | The Livengood-Wu integral has been applied widely as the simplest but most practical model to predict knocking or end-gas autoignition. The scientific nature of this empirical model was investigated by one of the authors. The integral value of 1/τ can be considered accumulated heat, meaning that 1/τ can be a conservable and transportable quantity, and its local integral can predict local autoignition in a heterogeneous air-fuel mixture or a diesel spray. Also, a set of several equations was developed to reproduce the temperature-, pressure-, and equivalence ratio-dependences of ignition delay time for a gasoline surrogate fuel produced using a detailed reaction mechanism. In the present report, ignition delay time equations have been developed for normal hexadecane. The Livengood-Wu integral with the equations has been applied to predict HCCI produced using a detailed reaction mechanism. When a period after distinct cool-flame reaction to ignition in an in-cylinder ignition process is prolonged, ignition timing predicted using the Livengood-Wu integral is retarded away from that produced using the detailed reaction mechanism, because the latter half of the integral is done in a distinct negative temperature coefficient region. The ignition delay time equation can be modified to weaken the negative temperature coefficient region and decrease the retard of predicted timing. |
