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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Effects of Pressure on Burning Velocity and Instabilities of Propane-Air Premixed Flames
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Effects of Pressure on Burning Velocity and Instabilities of Propane-Air Premixed Flames

机译：压力对丙烷-空气预混火焰燃烧速度和不稳定性的影响

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摘要

Spherically propagating laminar flames at elevated pressures in a large volume bomb were studied for propane-air mixtures. The effects of the initial mixture pressure on the burning velocity and flame instabilities were investigated varying the initial pressure from 0.10 to 0.50MPa. The Markstein number decreased with the increase in the initial pressure. The burning velocities at elevated pressures are affected not only by the change in the unstretched burning velocity but also by the variation in the Markstein number, or the variation in the sensitivity of the burning velocity to the flame stretch. The flame with a low Markstein number was unstable. Cellular flame structure developed earlier in such cases. Cellular structure accelerated the flame propagation. The burning velocity was affected by the flame instabilities in addition to the above two factors.
机译：在大型炸弹中，在高压下球形传播的层流火焰研究了丙烷-空气混合物。研究了初始混合压力对燃烧速度和火焰不稳定性的影响，其初始压力从0.10到0.50MPa不等。 Markstein数随初始压力的增加而降低。高压下的燃烧速度不仅受到未拉伸燃烧速度的变化的影响，而且还受到马克斯坦数的变化或燃烧速度对火焰拉伸敏感性的变化的影响。 Markstein值低的火焰不稳定。在这种情况下，蜂窝状火焰结构发展较早。蜂窝状结构加速了火焰的传播。除上述两个因素外，燃烧速度还受火焰不稳定性的影响。

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