Study on the Ignition Mechanism of Closed Cycle Diesel Engine System with Liquid Oxygen Carbon Sequestration

doi:10.3901/JME.2023.16.370

Abstract

Abstract: In order to study the ignition characteristics of liquid oxygen solid carbon closed cycle diesel engine,a diesel surrogate fuel n-heptane(n-C₇H₁₆) mechanism（COCD mechanism） in the O₂/CO₂ atmospheres is proposed.The mechanism considers two effects of CO₂（thermal third body effects） on n-heptane ignition process,which are employed to calculate the ignition delay time under multiple working conditions.The constant volume combustion chamber（CVCC） visual test platform are established to simulate the real working conditions of the liquid oxygen solid carbon closed cycle diesel engine for relevant experiment,which is also used for verifying the COCD mechanism.The two effects of CO₂ on the ignition delay time are compared and the key reactions in the ignition process under different conditions are studied by sensitivity analysis and rate of production（ROP） analysis.The maximum and minimum errors of the COCD mechanism predictions are 7.5%and 1.3%under the working conditions of 61%O₂/39%CO₂,53%O₂/47%CO₂,45%O₂/55%CO₂ and 40%O₂/60%CO₂.In the O₂/CO₂ atmospheres,the reaction C₇H₁₄O₂H+O₂→C₇H₁₄O₂HO₂ and H₂O+M→2OH are the main reactions that affect the n-heptane first and second stages heat release,respectively.

Key words: ignition characteristic, O₂/CO₂ atmosphere, CVCC experiment

CLC Number:

TK421

DING Lekang, LIU Yongfeng, BI Guijun, YAO Shengzhuo, YANG Jianwei, LIU Haifeng, SONG Jinou. Study on the Ignition Mechanism of Closed Cycle Diesel Engine System with Liquid Oxygen Carbon Sequestration[J]. Journal of Mechanical Engineering, 2023, 59(16): 370-378.

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