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Characterization of laminar premixed methanol-air flames

机译：层流预混甲醇-空气火焰的表征

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摘要

This study focuses on the effects of initial temperature and pressure on the propagation characteristics of laminar premixed flame of methanol-air mixtures. Spherically expanding laminar premixed flames, freely propagating from spark ignition sources in initially quiescent methanol-air mixtures, are continuously recorded by a high-speed CCD at various equivalence ratios and temperatures. The flames are then analyzed to deduce the flame speed. The stretch imposed on the spherical flame front is explored experimentally; as a consequence, the unstretched laminar burning velocities of methanol-air flames have been derived. The present measurements are compared with the experimental data reported previously, and good agreements are obtained. Combined previous results, a correlation in the form of u_ 1 - u_(lo)(T_u/T_(u0))~(alpha_(tau))(P_u/P_(u0))~(beta_p)^ has been developed to describe the dependences of initial temperature and pressure on the burning velocities of methanol-air flames. The global activation temperatures are determined in terms of the burning mass flux. And then, the Zeldovich numbers for methanol-air flames are estimated as a function of equivalence ratio. On the basis of the mass burning flux, an alternative correlation of laminar burning velocities has been proposed, and agreements can still be found in the comparison between this alternative forms and the power law correlation above.
机译：这项研究的重点是初始温度和压力对甲醇-空气混合物层流预混火焰传播特性的影响。由火花点火源在最初静止的甲醇-空气混合物中自由传播的球形扩展层流预混火焰，由高速CCD在各种当量比和温度下连续记录。然后分析火焰以推断火焰速度。实验研究了施加在球形火焰前缘上的拉伸。结果，得出了甲醇空气火焰的未拉伸层流燃烧速度。将当前的测量结果与先前报告的实验数据进行比较，并获得了良好的一致性。结合先前的结果，已开发出u_1-u_（lo）（T_u / T_（u0））〜（alpha_（tau））（P_u / P_（u0））〜（beta_p）^形式的相关性初始温度和压力对甲醇-空气火焰燃烧速度的依赖性。总体活化温度取决于燃烧质量通量。然后，将甲醇-空气火焰的Zeldovich数估算为当量比的函数。在质量燃烧通量的基础上，提出了层流燃烧速度的一种替代相关性，并且在这种替代形式与上述幂律相关性的比较中仍然可以找到一致。

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