外部热辐射作用下庚烷燃烧特性研究

Combustion behavior of burning heptane under external radiation

对不同辐射照度条件下的庚烷燃烧质量损失特性进行小尺度实验.探讨辐射照度对质量损失的阶段特征、表征时间、最大和平均质量损失速率的影响.结果表明：较低辐射照度条件下庚烷质量损失过程包含初始期、增长期、稳定期和衰减期,而较高辐射照度条件下仅包含增长期和衰减期.质量损失的特征时间随辐射照度增大而减小,随着辐射照度的进一步增大,特征时间趋于稳定.最大和平均质量损失速率均随辐射照度增加而增大,其比值相对稳定,维持在1.3～1.5.

Mass loss behavior of burning heptane under different levels of external radiation were studied using small scale exper- iments. Effects of different levels of radiant flux to phase char- acteristics, characteristic times, peak rates and average rates of mass loss were investigated. The results demonstrate four mass loss phases including initiation, growing, steady and decaying phase under lower flux levels while two phases including grow- ing and decaying phase under higher flux levels. Characteristic times decrease with increasing radiant flux and were expected having a stable trend with continued increased flux level. Peak and average rates of mass loss increase with increasing radiant flux, while the ratio Of peak and average mass loss rate keeps in a steady range of 1.3-1.5.