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| 低氧气浓度对腐殖质阴燃蔓延影响的实验研究 |
| Experimental Study on the Effect of Low Oxygen Concentration on Humus Smoldering Propagation |
| 投稿时间：2026-05-11 修订日期：2026-05-28 |
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| DOI： |
| 基金项目:四川省科技计划 |
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| 中文关键词: 阴燃 腐殖质 贫氧 森林地下火 |
| 英文关键词:smoldering humus oxygen-limited ground fires |
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| 中文摘要: |
| 森林地下火在深层地下发生发展时通常由于通风通道受限导致氧气供给困难、局部氧气浓度偏低。本工作通过改变氧气质量浓度来模拟深层地下中的贫氧环境，研究腐殖质竖向阴燃蔓延规律。研究发现，随着阴燃深度的增加，炭氧化层厚度逐渐增大，炭氧化反应占据阴燃反应的主导地位；热解前锋和炭氧化前锋蔓延速率随着燃烧深度逐渐减小。实验观测到阴燃平均蔓延速率与氧气质量浓度存在明显的正相关关系，并给出了理论解释。由于灰烬层厚度的增加导致绝热性能增大，阴燃峰值温度随燃烧深度的增加而逐渐增大，在21%的氧气质量浓度条件下易出现强烈表面氧化现象，且氧气质量浓度增大会提高阴燃反应的整体强度导致峰值温度增大。 |
| 英文摘要: |
| When underground forest fires develop in deep underground layers, they often face difficulties in oxygen supply and exhibit lower local oxygen concentrations due to restricted ventilation channels. This work simulates the oxygen-deficient environment in deep underground by varying oxygen mass concentrations to investigate the vertical downward smoldering propagation patterns of humus. The results indicate that with increasing smoldering depth, the thickness of the char oxidation layer gradually increases, and the char oxidation reaction becomes dominant in the smoldering process. Both the pyrolysis front and char oxidation front propagation rates decrease progressively with combustion depth. Experimental observations revealed a significant positive correlation between the average smoldering spread rate and oxygen concentration, with a theoretical explanation provided. Due to enhanced thermal insulation from the thickening ash layer, the peak smoldering temperature gradually rises with increasing depth. Under 21% oxygen concentration, glowing phenomena are more likely to occur. Additionally, increased oxygen concentration elevates the overall intensity of the smoldering reaction, leading to higher peak temperatures. |
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