当前位置: X-MOL 学术Sādhanā › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experiments on unsteady pool fires – effects of fuel depth, pan size and wall material
Sādhanā ( IF 1.6 ) Pub Date : 2021-03-10 , DOI: 10.1007/s12046-021-01571-x
A Shiva Kumar , A V E Sowriraajan , C S Bhaskar Dixit , H S Mukunda

This paper presents specifically designed experiments to understand the effect of range of parameters on pool burn behavior with liquid fuels. Experiments have been conducted on pool fires with 0.1–2 m diameter pans and depths of 40, 50, 60 and 90 mm with n-heptane fuel depths up to 30 mm floated on water and without water in an indoor fire laboratory. Pans of 0.2 m dia are made of glass, stainless steel, mild steel and aluminum and larger diameter pans only of mild steel. The experiments conducted include some with fuel initial temperature effects at 300, 319 and 343 K. Data on temporal evolution of mass burn, pan wall temperatures, temperatures inside the liquid at some depths and gas phase temperatures at select heights from the pool surface have been obtained from the experiments. Results show that at larger fuel depths of (\(\sim \) 30 mm), a burn mass flux of 60–75 g/m\(^2\)s is reached even in 0.2 m dia pans. This flux is expected only in large pans of about 2 m size. Regarding pan material effect, glass pans show mildly increasing low flux values (10–15 g/m\(^2\)s) and mild steel and aluminum pans show an initial low flux value (\(\sim \) 10 g/m\(^2\)s) and then a sharp change to large flux values depending on the depth. At larger depths, the flux values go up to 65 g/m\(^2\)s. In case of stainless steel, the mass flux variation occurs smoothly all through towards increasing values. As regards the water depth below the fuel, the decrease in the average burn rate is about 1 % per mm water depth up to 20 mm for all pans with diameter below 0.5 m. Larger size pans with burn rate controlled largely by radiation show much reduced effect of the water depth. In order to correlate the data with diverse parameters a dimensionless number, Mpc, has been invoked using scaling laws, and a correlation that provides a good estimate of the mass burn flux including all the effects considered earlier has been deduced. The data set thus generated provides the basis for a more detailed model to predict the mass loss history and other parameters.



中文翻译:

不稳定池火的实验–燃料深度,锅尺寸和壁材料的影响

本文提出了专门设计的实验,以了解参数范围对液体燃料对池燃烧行为的影响。在室内火灾实验室中,对直径为0.1–2 m的锅具,深度为40、50、60和90 mm的正庚烷燃料进行了实验,其中深度为30 mm的正庚烷浮在水上,无水。直径为0.2 m的锅由玻璃,不锈钢,低碳钢和铝制成,直径较大的锅仅由低碳钢制成。所进行的实验包括一些在300、319和343 K时具有燃料初始温度影响的实验。有关质量燃烧,盘壁温度,某些深度处的液体内部温度以及距池表面一定高度的气相温度的时间演变数据已经得到。从实验中获得。结果表明,在较大的燃油深度下,\(\ sim \) 30毫米),即使在0.2 m的直径锅中,燃烧质量通量也达到60-75 g / m 2(^ 2 \) s。仅在约2 m大小的大锅中才预期有这种通量。关于锅的材料效果,玻璃锅显示出较低的通量值(10–15 g / m \(^ 2 \) s),温和增加,低碳钢和铝锅显示出初始的低通量值(\(\ sim \) 10 g / m \(^ 2 \) s),然后根据深度急剧变化为较大的通量值。在较大深度处,通量值高达65 g / m \(^ 2 \)s。对于不锈钢,质量通量的变化会一直持续到增加值为止。关于燃料下方的水深,对于直径小于0.5 m的所有锅,平均燃烧率的降低约为每毫米水深1%,最高可达20 mm。燃烧速度很大程度上受辐射控制的较大尺寸的烤盘显示出水深的影响大大降低。为了使数据与各种参数相关联,已使用缩放定律调用了无量纲数Mpc,并推导了提供对质量燃烧通量的良好估计(包括先前考虑的所有影响)的相关性。这样生成的数据集为更详细的模型预测质量损失历史和其他参数提供了基础。

更新日期:2021-03-10
down
wechat
bug