西藏高原环境下油池火的燃烧速率和振荡频率

Pool Fire Burning Rate and Oscillation Frequency Under Tibet Plateau Environment

通过拉萨和合肥两地开展相同尺寸的甲醇油池火燃烧实验,研究了高原油池火燃烧特性参数与平原的不同以及具体的影响机制.研究发现,在燃料类型和燃烧尺寸相同的情况下,燃料在拉萨的质量燃烧速率比合肥慢;基于火焰图像分析,用MATLAB编程对两地火焰图像进行处理,确定了在相同尺寸的油盘下,由于受低氧低压条件的影响,拉萨火焰面积比合肥要大,火焰高度比合肥要高,在拉萨火焰振荡频率比合肥要快;通过实验数据拟合出适合高原低氧低压环境下的火焰振荡频率公式.

Experiments on methanol pool fire of the same size were carried out in both Lhasa and Hefei,different combustion characteristics on plateau and plain were investigated,and influence mechanisms were then analyzed.The experimental results show that fire sources with the same fuel type and size generated lower burning rate in Lhase than in Hefei.A program is written to analyze flame luminance image sequences based on MATLAB.It’s found that with the same size of pan,the flame in Lhase is higher and larger in area and oscillates faster than that in Hefei.A formula describing oscillation frequency in high-altitude localities is established by fitting the experimental data.