|
| 环境风作用下火焰在双坡山脊结构中的形态演化及背风坡热流分布规律研究 |
| Study on Flame Morphology Evolution and Leeward Slope Heat Flux Distribution under Environmental Wind in a Dual-Slope Ridge Structure |
| 投稿时间：2025-11-25 修订日期：2026-04-26 |
| 查看/发表评论 下载PDF阅读器 |
| DOI： |
| 基金项目:国家自然科学基金-青年科学基金项目（C类）（52506172）、国家自然科学基金优秀青年科学基金项目（海外）（GG2320007006）、国家外国专家项目（S20240148）、中国科学技术大学统筹推进世界一流大学和一流学科建设专项资金资助（YD2320002009）和中国科大科研启动业务费（KY2320000046、KY2320000055） |
|
| 中文关键词: 山脊 环境风 火焰附着 下游热流分布 火焰形态 |
| 英文关键词:Ridge Environmental wind Flame attachment Downstream heat flux Flame morphology |
| 摘要点击次数: 124 |
| 全文下载次数: 0 |
| 中文摘要: |
| 当火灾发生于山脊地形区域时，其行为往往难以预测。本研究通过缩尺度实验，探究了环境风作用下火焰跨越山脊后的形态演化及背风坡表面热流分布规律，系统分析了风速、坡度和火源功率的影响机制。实验结果表明，风速增加促进火焰沿背风坡延伸并增强贴附趋势，而坡度增大会削弱火焰附着。在本实验尺度下，当θ ≥ 12.5°时，附着状态明显转变，火焰基本脱离坡面。火焰附着行为与背风坡热流分布密切相关，该分布呈现三类典型趋势：单峰分布（火焰稳定贴附）、双峰分布（火焰抬升-再贴附）及单调递减（无显著贴附）。基于无量纲分析，建立了火焰尺寸参数与无量纲空气供给参数之间的幂律关系，进而构建了分段式热流预测模型，量化了火焰贴附特性对热传递的主导作用。本研究为山脊地形火灾蔓延的风险评估与预测提供了理论依据。 |
| 英文摘要: |
| When fires occur in ridge terrains, their behavior is often difficult to predict. In this study, reduced-scale experiments were conducted to investigate the flame morphology evolution after crossing a ridge and the heat flux distribution on the leeward slope under ambient wind conditions. The effects of wind speed, slope angle, and heat release rate were systematically analyzed. The results show that increasing wind speed promotes flame extension along the leeward slope and enhances flame attachment, whereas increasing slope angle weakens attachment. Under the present experimental scale, when θ ≥ 12.5°, the attachment state changes markedly and the flame largely detaches from the slope surface. Flame attachment is closely related to the heat flux distribution on the leeward slope, which exhibits three typical patterns: single-peak distribution (stable attachment), double-peak distribution (flame lift-off and reattachment), and monotonic decay (no significant attachment). Based on dimensional analysis, a power-law relationship between flame geometric parameters and a dimensionless air supply parameter was established, and a piecewise heat flux prediction model was further developed to quantify the dominant role of flame attachment in heat transfer. This study provides a theoretical reference for assessing and predicting fire spread risk in ridge terrains. |
| 关闭 |
