| 陈丹丹,袁焱华,谢启源.外加热流与桐油涂层对木材向下火蔓延特性的影响研究[J].火灾科学,2025,34(1):18-29. |
| 外加热流与桐油涂层对木材向下火蔓延特性的影响研究 |
| Effects of external heat flux and tung oil coatings on the downward flame spread characteristics of wood |
| |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| DOI：10.3969/j.issn.1004-5309.2025.01.03 |
| 基金项目:国家自然科学基金项目(52276139);国家重点研发计划项目(2020YFC1522801) |
|
| 中文关键词: 向下火蔓延 松木 桐油涂层 外加热流 |
| 英文关键词:Downward flame spread Pine wood Tung oil coating External heat flux |
| 摘要点击次数: 1075 |
| 全文下载次数: 38 |
| 中文摘要: |
| 我国木质古建筑数量多、文化价值高、火灾风险大且防控救援难。古建筑木质构件表面常用桐油涂层进行防腐防水,针对不同桐油厚度(0 g/m2、20 g/m2和30 g/m2)的松木板,开展了不同外加热流(4.2 kW/m2、4.9 kW/m2、5.7 kW/m2、6.4 kW/m2、7.1 kW/m2和7.9 kW/m2)强化预热条件下竖直向下火蔓延特性实验和不同配比材料的热解实验。结果表明,松木表面涂敷桐油涂层后,其竖直向下火蔓延速度显著降低,尤其是当外加热流通量较大时,火蔓延速度降低尤为明显(如:7.9 kW/m2工况,桐油厚度为0 g/m2、20 g/m2和30 g/m2时松木板的平均火蔓延速度分别为:6.5 mm/s、4.7 mm/s和3.0 mm/s)。此外,尽管表面桐油涂层有利于抑制木材表面的早期引燃和火蔓延燃烧速度,然而引燃后,松木原板易形成“快速小火”,而涂敷桐油的松木板易形成“慢速大火”。最后,结合松木和桐油样品的材料特性及其热响应特征,揭示了表层涂敷桐油对木材向下火蔓延的影响机理。 |
| 英文摘要: |
| China is home to a large number of ancient wooden buildings that are culturally significant but highly susceptible to fire risks, with challenges in fire prevention and emergency response. Tung oil coatings are commonly applied to the wooden components of ancient buildings for their preservative and waterproofing qualities. This paper focuses on the experimental investigation of the downward flame spread characteristics over pine wood panels with different thicknesses of tung oil coatings (0 g/m2, 20 g/m2 and 30 g/m2) under different external heat fluxes (4.2 kW/m2, 4.9 kW/m2, 5.7 kW/m2, 6.4 kW/m2, 7.1 kW/m2 and 7.9 kW/m2) and the thermogravimetry of samples with different ratios of pine powder and tung oil. The results indicate that applying tung oil on wood reduces the vertical downward flame spread speed, especially under high-intensity external heat fluxes. For example, at a heat flux of 7.9 kW/m2, the average spread speeds for pine with 0 g/m2, 20 g/m2 and 30 g/m2 tung oil thickness are 6.5 mm/s, 4.7 mm/s and 3.0 mm/s, respectively. Moreover, while tung oil coating is significantly effective in suppressing early ignition and flame spread speeds on wood surfaces, it contributes to a "slow and large flame" post-ignition, as opposed to the "quick and small flame" observed for uncoated wood. Lastly, by integrating the material characteristics and thermal properties of pine and tung oil samples, the mechanism is developed for the downward flame spread of wood panels with tung oil coatings. |
| 关闭 |
|
|
|
