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首页> 外文期刊>Fuel >A comprehensive study on laminar burning velocity and flame stability of oxy-producer gas mixtures. Part-2: Laminar burning velocity and Markstein length analysis
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A comprehensive study on laminar burning velocity and flame stability of oxy-producer gas mixtures. Part-2: Laminar burning velocity and Markstein length analysis

机译：氧化氧化液混合物层流燃烧速度及火焰稳定性的综合研究。 第2部分：层流燃烧速度和Markstein长度分析

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Part-1 reported the extent of variation in each species in producer gas (PG) mixture(s) after a thorough literature study. Forty-five PG variants were identified to analyse the effect of each species on the combustion characteristics of PG-O2 mixtures. Spherical flame method was used for measuring laminar burning velocities and burned gas Markstein lengths of PG at 1 bar, 300 K and ? = 0.8 in a 4.5 L spherical chamber. Extrapolation (linear and non-linear) and non-extrapolation based schemes were used to estimate unstretched flame speed. LBV extracted from all three schemes were in good agreement within ?4.92%. Only H2/CO-rich-PG-O2 mixtures having mole fraction of combustible components (CC) less than 20% displayed negative Lb values and their effective Lewis numbers were less than the respective critical values and were corroborated with experimental results. CH4-rich-PG-O2 mixtures were unconditionally stable. Their LBV was the highest at most conditions due to high flame temperatures, with exception to LBV of H2-N2-rich-PG-O2 mixtures at 45%CC owing to large thermal diffusivities. LBV varied non-linearly as CO2 in non-combustible components (NCC) increased beyond 50% and its suppressing effect was the highest in CH4-rich-PG. Simulations were performed using 1D expanding spherical flame model in COSILAB with GRI-Mech3.0. Simulated LBV showed a deviation of ?13.2% with experimental values at 45%CC. Unstretched LBV obtained from non-extrapolation-mapping method which involved simulation results showed good agreement with experiments. Combustion of PG with higher H2, CO and N2 content and relatively lesser amounts of CH4 and CO2 were stable to preferential diffusion effects and predictable to fluctuations in composition.
机译：第1部分在彻底的文学研究中报告了生产者气体（PG）混合物中每种物种的变化程度。鉴定了四十五个PG变体以分析每种物种对PG-O2混合物燃烧特性的影响。球形火焰方法用于测量Laminar燃烧速度，并在1巴，300k和燃烧的气体Markstein长度。在4.5L球形室中= 0.8。外推（线性和非线性）和非外推的方案用于估计未拉伸的火焰速度。从所有三种方案中提取的LBV均在内良好？4.92％。仅具有小于20％的燃烧成分（CC）的摩尔级分的H 2 /共质-PG-O2混合物小于20％的阴性LB值，并且其有效的Lewis数小于相应的临界值，并用实验结果得到证实。 CH 4富含PG-O2混合物无条件稳定。由于高火焰温度，它们的LBV是最多的最高条件下，由于热扩散性大的45％CC，H2-N2富含-PG-O2混合物的LBV。当不可燃烧的组分（NCC）中的CO 2不超过50％时，LBV非线性地变化，其抑制作用是CH 4富含PG的最高。使用COSILAB中的1D扩展球形火焰模型进行模拟，用GRI-MECH3.0。模拟LBV显示出α的偏差13.2％，实验值在45％CC下。从非外推 - 映射方法获得的未拉伸LBV，涉及模拟结果的仿真结果表明与实验吻合良好。 PG具有较高H 2，CO和N2含量的燃烧和相对较小的CH 4和CO 2对优先的扩散效应稳定，并且可以预测组合物的波动。

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