Fractal Characteristics of Combustion Instability for a Natural Gas Engine

DING Shunliang; LIU Jinjin; MOU Junchao; CUI Chao; SONG Enzhe; YANG Fuyuan

doi:10.7652/xjtuxb202212003

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Fractal Characteristics of Combustion Instability for a Natural Gas Engine

更新时间：2025-07-09

- Fractal Characteristics of Combustion Instability for a Natural Gas Engine
- Vol. 56, Issue 12, Pages: 23-32(2022)
- 作者机构：
  
  1. 郑州大学机械与动力工程学院,郑州,450001
  2. 上海船用柴油机研究所,上海,201108
  3. 哈尔滨工程大学动力与能源工程学院,哈尔滨,150001
  4. 清华大学汽车安全与节能国家重点实验室,北京,100084
  5. 清华大学车辆与运载学院,北京,100084
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202212003
  CLC： TK464
- Online First：10 December 2022，
  
  Published：2022
- 稿件说明：
移动端阅览
DING Shunliang, LIU Jinjin, MOU Junchao, et al. Fractal Characteristics of Combustion Instability for a Natural Gas Engine[J]. 2022, 56(12): 23-32.
DOI：

DING Shunliang, LIU Jinjin, MOU Junchao, et al. Fractal Characteristics of Combustion Instability for a Natural Gas Engine[J]. 2022, 56(12): 23-32. DOI： 10.7652/xjtuxb202212003.

摘要

为了揭示点火正时θ

sit

对天然气发动机燃烧不稳定性的影响规律

在低负荷工况下

针对不同θ

sit

工况进行试验

利用多重分形和多尺度熵方法对指示平均有效压力p

imep

、放热量Q时间序列进行分析

并利用p

imep

的循环变动系数P

CCV

进行验证

对天然气发动机燃烧不稳定性的分形特征进行了定性、定量研究。结果表明:天然气发动机燃烧过程呈现出一定的分形特征

随着θ

sit

提前

Hurst指数变化差值和奇异谱宽度先增大后减小

CCV

先减小后增大

多尺度熵随尺度因子的增加而减小

燃烧不稳定性的分形复杂度和反持续相关性先增强后减弱

表明存在一个最优θ

sit

使得天然气发动机的燃烧稳定性达到最佳。并且

对θ

sit

影响天然气发动机燃烧不稳定性的原因进行了研究

为改善天然气发动机稀燃稳定性提供了理论依据。

Abstract

To reveal the pattern of influence of θ

sit

on combustion instability for natural gas engine

experiments are carried out under low load condition with different θ

sit

. The multi-fractal and multiscale entropy methods are applied to analyze the experimental p

imep

and Q time series

and the P

CCV

of p

imep

are used to verify the results. The fractal characteristics of combustion instability for the natural gas engine is qualitatively and quantitatively analyzed. Results show that the combustion process for natural gas engine

exhibits certain fractal characteristics. With θ

sit

being advanced

the difference value of Hurst index and the width of singular spectrum increase at first and then decrease; the P

CCV

decreases at first and then increases; the multiscale entropy decreases asτ increases. The fractal complexity and anti-persistence correlation of combustion instability enhance at first and then weaken

indicating that there is an optimal θ

sit

which makes the combustion stability of natural gas engine reach its best. In addition

the analysis on the causes of θ

sit

affecting the combustion instability provides a theoretical basis for improving the lean-burn stability of natural gas engine.

关键词

Keywords

references

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