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Measurements of Markstein numbers and laminar burning velocities for liquefied petroleum gas-air mixtures

机译：液化石油气-空气混合物的马克斯坦数和层流燃烧速度的测量

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Experimental test for premixed laminar combustion of liquefied petroleum gas-air mixtures is conducted in a constant volume combustion bomb. Spherically expanding flames have been employed to measure laminar flame speeds over wide equivalence ratios, at the initial pressures of 0.05, 0.1 and 0.15 MPa, and preheat temperatures from 300 to 400 K. To study the effects of stretch on burning velocity, various Markstein numbers for both strain and curvature have been measured and the effects of initial temperature and pressure on these parameters have been discussed. Following the linear relation between flame speeds and flame stretches, one has then obtained the corresponding unstretched laminar burning velocity after omitting the effect of stretches imposed on these flames. Over the ranges studied, laminar burning velocities are fit by a functional form u_1 = u_(l0)(T_u/T_(u0))~(alpha_T)(P_u/P_(u0))~(beta_P), and the dependencies of alpha_T and beta_P upon the equivalence ratio of mixture are also discussed.
机译：在恒定体积的燃烧弹中进行液化石油气与空气混合物的预混合层流燃烧的实验测试。在初始压力​​为0.05、0.1和0.15 MPa，预热温度为300至400 K的情况下，已采用球形膨胀火焰来测量较宽当量比的层流火焰速度。要研究拉伸对燃烧速度的影响，需要使用各种Markstein数测量了应变和曲率，并讨论了初始温度和压力对这些参数的影响。遵循火焰速度与火焰延伸之间的线性关系，在忽略了施加在这些火焰上的延伸的影响之后，人们便获得了相应的未拉伸层流燃烧速度。在研究的范围内，层流燃烧速度由函数形式u_1 = u_（l0）（T_u / T_（u0））〜（alpha_T）（P_u / P_（u0））〜（beta_P）拟合，并且具有alpha_T的依存关系还讨论了混合物当量比的β和β_P。

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