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Laminar burning velocity and explosion index of LPG-air and propane-air mixtures

机译：LPG-空气和丙烷-空气混合物的层流燃烧速度和爆炸指数

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The determination of burning velocity is very important for the calculations used in hazardous waste explosion protection and fuel tank venting, which has a direct impact on environmental protection. The scope of the present study encompass an extensive study to map the variations of the laminar burning velocity and the explosion index of LPG-air and propane-air mixtures over wide ranges of equivalence ratio (Φ = 0.7-2.2) and initial temperature (T_i = 295-400 K) and pressure (P_i = 50-400 kPa). For this purpose a cylindrical combustion bomb was developed. The reliability and accuracy of the built up facility together with the calculation algorithm are confirmed by comparing the values of the laminar burning velocity obtained for a standard fuel (propane at normal pressure normal temperature conditions, NPT) with those available in the literature. The burning velocity was determined using different models depending on the pressure history (P-t) of the central ignition combustion process at the minimum ignition energy. The data obtained for the laminar burning velocity is correlated to S_L = S_(L0)(T/T_0)~α(P/P_0)~β where S_(L0) is the burning velocity at NPT, α and β are the temperature and pressure exponents respectively. The value of β is observed to slightly vary with the equivalence ratio for both fuels. However, propane exhibits higher pressure dependency than that of LPG. The maximum laminar burning velocity found for propane is nearly 455 mm/s at Φ = 1.1, while that for LPG is nearly 432 mm/s at 4.5% fuel percent (Φ ≈ 1.5). The maximum explosion index, commonly called the "explosion severity parameter", is calculated from the determined laminar burning velocity and is found to be 93 bar m/s for propane, and nearly 88 bar m/s for LPG.
机译：燃烧速度的确定对于危险废物爆炸防护和燃料箱通风的计算非常重要，这对环境保护有直接影响。本研究的范围包括广泛的研究，以绘制层流燃烧速度的变化以及液化石油气-空气和丙烷-空气混合物的爆炸指数在相当的当量比（Φ= 0.7-2.2）和初始温度（T_i）的范围内的情况。 = 295-400 KPa）和压力（P_i = 50-400 kPa）。为此目的，开发了圆柱形燃烧弹。通过将标准燃料（丙烷在常压常温条件下，NPT）获得的层流燃烧速度值与文献中获得的值进行比较，可以确定建造设施的可靠性和准确性以及计算算法。根据中央点火燃烧过程在最小点火能量下的压力历史（P-t），使用不同的模型确定燃烧速度。层流燃烧速度获得的数据与S_L = S_（L0）（T / T_0）〜α（P / P_0）〜β相关，其中S_（L0）是NPT时的燃烧速度，α和β是温度，压力指数。观察到β值随两种燃料的当量比而略有变化。但是，丙烷比LPG具有更高的压力依赖性。丙烷的最大层流燃烧速度在Φ= 1.1时接近455 mm / s，而液化石油气在4.5％的燃料百分数（Φ≈1.5）下接近432 mm / s。最大爆炸指数，通常称为“爆炸严重性参数”，是根据确定的层流燃烧速度计算得出的，丙烷为93 bar m / s，LPG为近88 bar m / s。

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