Multi-Scale Analysis of Combustion Instability in Natural Gas Engine

doi:10.7652/xjtuxb202201004

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Multi-Scale Analysis of Combustion Instability in Natural Gas Engine

更新时间：2025-05-08

- Multi-Scale Analysis of Combustion Instability in Natural Gas Engine
- Vol. 56, Issue 1, Pages: 31-40(2022)
- 作者机构：
  
  郑州大学机械与动力工程学院,郑州,450001
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202201004
  CLC： TK464
- Online First：10 January 2022，
  
  Published：2022
- 稿件说明：
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Multi-Scale Analysis of Combustion Instability in Natural Gas Engine[J]. 2022, 56(1): 31-40.
DOI：

Multi-Scale Analysis of Combustion Instability in Natural Gas Engine[J]. 2022, 56(1): 31-40. DOI： 10.7652/xjtuxb202201004.

摘要

为了揭示过量空气系数λ在多尺度上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λ值进行试验

对平均指示压力时间序列进行小波分析和多分辨率分析

研究多尺度上天然气发动机燃烧不稳定性。结果表明:天然气发动机燃烧过程呈现明显的多尺度特性

且燃烧不稳定性与各尺度上细节信号的波动具有较强的相关性; 当混合气浓度较大时

压力波动呈现出持久性的大尺度周期振荡模式; 随着λ增加

高频尺度范围出现了间歇性的短周期振荡

高频细节信号的波动特征加剧

邻近燃烧循环之间的关联性增强

呈现出更复杂的动力学特征; 在接近稀燃极限工况时

高频细节信号D

对燃烧不稳定性的贡献率更大。同时

对燃烧过程多尺度确定性变化的原因进行了分析

为天然气发动机稀燃稳定性控制提供了理论依据。

Abstract

To reveal the influence of excess air coefficient(λ)on combustion instability of natural gas engines at multiple scales

experiments were performed with different values of λ under low load conditions. The combustion instability of natural gas engine was analyzed at multiple scales using wavelet analysis and multi-resolution analysis of the p

imep

time series. Results show that the combustion process of natural gas engine presents obvious multi-scale characteristics

and there is a strong correlation between the combustion instability and the fluctuation of the detail signal on each scale. The pressure fluctuation presents a persistent large-scale periodic oscillati

on phenomenon when the mixture is rich. With the increase of λ value

intermittent short periodic oscillations appear in the high-frequency scale

the fluctuation features of the high-frequency signal are intensified

and the correlation between adjacent cycles is enhanced

showing more complex dynamic characteristics. While under lean-burn limit conditions

the contribution of the high-frequency signal D

to the combustion instability is greater than that of other signals with different frequencies. Meanwhile

the causes for the multi-scale deterministic changes in the combustion process were investigated

which provides a theoretical basis to improve the lean-burn stability of natural gas engines.

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