Non-Equilibrium Thermodynamic Analysis on Exergy Destruction During Auto-Ignition of Methane-Hydrogen Blends

WU Honghuan; HONG Congjie; CAO Jun; HUANG Zuohua; ZHANG Yingjia

doi:10.7652/xjtuxb202211014

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Non-Equilibrium Thermodynamic Analysis on Exergy Destruction During Auto-Ignition of Methane-Hydrogen Blends

更新时间：2025-07-09

- Non-Equilibrium Thermodynamic Analysis on Exergy Destruction During Auto-Ignition of Methane-Hydrogen Blends
- Vol. 56, Issue 11, Pages: 138-147(2022)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202211014
  CLC： TK431
- Online First：10 November 2022，
  
  Published：2022
- 稿件说明：
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WU Honghuan, HONG Congjie, CAO Jun, et al. Non-Equilibrium Thermodynamic Analysis on Exergy Destruction During Auto-Ignition of Methane-Hydrogen Blends[J]. 2022, 56(11): 138-147.
DOI：

WU Honghuan, HONG Congjie, CAO Jun, et al. Non-Equilibrium Thermodynamic Analysis on Exergy Destruction During Auto-Ignition of Methane-Hydrogen Blends[J]. 2022, 56(11): 138-147. DOI： 10.7652/xjtuxb202211014.

摘要

为明晰天然气掺氢发动机非平衡燃烧过程主要损源

本文利用自点火压力时程对文献中5个代表性CH

燃烧动力学模型性能进行再评估

基于非平衡态热力学理论初步建立了基元反应损评估方法

结合详细动力学模型分析了不同约束条件下(温度、当量比、掺氢比)CH

混合气自点火过程中基元反应损贡献及其变化规律。结果表明

反应初始温度升高

化学反应损减少

不完全燃烧损失增加。H

掺混虽未显著降低CH

燃烧最低损值

但有效扩展了CH

低损燃烧区。对比了不同温度、不同掺氢比下损速率和总损的时程演化

分析了H(·overO)

和(·overO)H自由基产率及其主导基元反应损贡献

揭示了初始温度和掺氢对燃烧损影响的动力学机制。进一步对比不同反应路径关键物种吉布斯自由能

从热力学角度解释了CH

高/低温氧化路径损差异。研究结果在基元反应水平上揭示了H

介入对CH

燃烧损的影响机制

可为探索减少天然气掺氢发动机损的控制方法提供理论依据。

Abstract

This paper analyzes the main sources of exergy destruction during the non-equilibrium combustion of the hydrogen-natural gas engine. The performance of five representative CH

kinetic models in the literature is re-evaluated and a method for calculating exergy destruction of elementary reactions is preliminarily established based on non-equilibrium thermodynamics. Combined with the selected kinetic model

the exergy destr

uction behaviors during the auto-ignition of CH

mixtures under different initial conditions(temperatures

equivalence ratios

hydrogen ratios)are numerically analyzed. According to the results

with the initial temperature increases

exergy destruction caused by chemical reaction decreases

while exergy destruction from incomplete combustion increases. Moreover

addition shows little effect on the total exergy destruction

but effectively extends the low exergy destruction zone of CH

combustion. The time histories of exergy destruction at different temperatures and varied H

additions are compared; the rates of production(ROP)of H(·overO)

and(·overO)H radicals

as well as the contribution of the elementary reactions that dominate their generation and consumption to the exergy destruction

are analyzed

to reveal the effects of initial temperature and H

addition on exergy destruction of CH

combustion. Furthermore

the discrepancy in exergy destruction between CH

high-/low-temperature oxidation pathways is thermodynamically clarified by comparing the Gibbs free energy of key species during fuel oxidation. The research results reveal the effects of H

addition on exergy destruction during CH

combustion at molecular reaction level

and is expected to provide theoretical guidance for further reducing exergy destruction of hydrogen-natural gas engine combustion.

关键词

Keywords

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