Fractal Characteristics of Combustion Instability for a Natural Gas Engine

被引：0

作者：

Ding S. ^{[1
]}

Liu J. ^{[1
]}

Mou J. ^{[2
]}

Cui C. ^{[1
]}

Song E. ^{[3
]}

Yang F. ^{[4
,5
]}

机构：

[1] School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou

[2] Shanghai Marine Diesel Engine Research Institute, Shanghai

[3] College of Power and Energy Engineering, Harbin Engineering University, Harbin

[4] State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing

[5] School of Vehicle and Mobility, Tsinghua University, Beijing

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2022年 / 56卷 / 12期

关键词：

combustion instability; multi-fractal analysis; multi-scaleentropy; natural gas engine; spark ignition timing;

D O I：

10.7652/xjtuxb202212003

中图分类号：

学科分类号：

摘要：

To reveal the pattern of influence of θsit on combustion instability for natural gas engine, experiments are carried out under low load condition with different θsit. The multi-fractal and multiscale entropy methods arc applied to analyze the experimental Pimep and Q time series, and the PCCV of pimep 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 θsit being advanced, the difference value of Hurst index and the width of singular spectrum increase at first and then decrease; the PCCV decreases at first and then increases; the multiscale entropy decreases as τ increases. The fractal complexity and anti-persistence correlation of combustion instability enhance at first and then weaken, indicating that there is an optimal θsit which makes the combustion stability of natural gas engine reach its best. In addition, the analysis on the causes of θsit affecting the combustion instability provides a theoretical basis for improving the lean-burn stability of natural gas engine. © 2022 Xi'an Jiaotong University. All rights reserved.

引用

页码：23 / 32

页数：9

共 26 条

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