Effect of microwave assisted ignition on CO2 diluted methane combustion

doi:10.3969/j.issn.1674-8484.2022.01.015

Abstract

Abstract:

This paper investigated the characteristics of microwave-assisted ignition of methane under CO₂ dilution conditions to improve the thermal efficiency of internal combustion engines and reduce the emission of pollutants. Explored that microwave was fed to the opposed electrodes to promote ignition, and the development law of early flame core under different test conditions by using high-speed schlieren method based on a constant volume combustible bomb platform. The results show that in Microwave Assisted Ignition (MAI) mode, the CO₂ dilution limit is improved, and the 16% CO₂ dilution ratio can still be successfully ignited. Under the condition of 8% CO₂ dilution ratio, feeding microwave energy expands the methane ignition limit from 0.7 in the Spark Ignition (SI) mode to 0.6. With the increase of microwave power, the equivalent radius of flame core increases, but the degree of increase gradually decreases, the enhancement effect of microwave frequency on the flame core under different CO₂ dilution ratios is different. These results can provide theoretical support for the application of microwave assisted ignition technology under Exhaust Gas Recirculation (EGR) atmosphere.

Key words: internal combustion engines, microwave assisted ignition (MAI), CO₂ dilution, plasma, time window

CLC Number:

U467.1+4

WANG Zhihao, ZHANG Xinhua, WU Huimin, LIU Chaohui, WANG Zhaowen, HUANG Ronghua, LI Dinggen, WANG Zhi. Effect of microwave assisted ignition on CO₂ diluted methane combustion[J]. Journal of Automotive Safety and Energy, 2022, 13(1): 149-156.

Figures/Tables 11

References 24

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Effect of microwave assisted ignition on CO₂ diluted methane combustion

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