甲烷掺氢自点火非平衡态热力学(火用)损分析

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甲烷掺氢自点火非平衡态热力学(火用)损分析

更新时间：2025-07-09

- 甲烷掺氢自点火非平衡态热力学(火用)损分析
- 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
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK431
- Published：2022
- 稿件说明：
移动端阅览
[J]. 2022, (11): 138-147.
DOI：

[J]. 2022, (11): 138-147. DOI：

摘要

为明晰天然气掺氢发动机非平衡燃烧过程主要（火用）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（火用）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（火用）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（火用）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（火用）损值，但有效扩展了CH

低（火用）损燃烧区。对比了不同温度、不同掺氢比下（火用）损速率和总（火用）损的时程演化，分析了HO

和OH自由基产率及其主导基元反应（火用）损贡献，揭示了初始温度和掺氢对燃烧（火用）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（火用）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（火用）损的影响机制，可为探索减少天然气掺氢发动机（火用）损的控制方法提供理论依据。

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