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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Influence of gravity on combustion and flammability of heptane droplets in air-diluent environments
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Influence of gravity on combustion and flammability of heptane droplets in air-diluent environments

机译：重力对空气稀释环境中庚烷液滴燃烧和可燃性的影响

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摘要

Reduced gravity and normal gravity combustion experiments were performed with individual fiber-supported heptane droplets with initial diameters that were initially in the 1-mm size range. Most experiments were performed with an air-inert mixture at 0.1 MPa and about 298 K, where helium, carbon dioxide and xenon were separately used as inerts. Some experiments were also performed at 0.3 MPa and 298 K with air-xenon environments. The amount of inert gas in the environment was progressively increased until droplets could no longer be ignited. Droplet ignitability depended on the gravitational level as well as the inert gas in the environment. The amount of inert gas required to suppress combustion was generally higher in reduced gravity than normal gravity, and use of xenon required significantly higher mole fractions for suppression of combustion relative to helium or carbon dioxide. In general, increasing the amount of inert gas decreased burning rates. The data indicate that ambient gas transport properties play an important role in determining flammability and combustion behaviors of droplets. Comparison with other experimental data obtained with propanol droplets shows that ignitability and combustion characteristics of droplets can also be influenced by the fuel type.
机译：使用初始直径最初在1毫米大小范围内的纤维负载的庚烷微滴进行了重力降低和正常重力燃烧实验。大多数实验是在0.1 MPa和约298 K的空气惰性混合物下进行的，其中氦，二氧化碳和氙分别用作惰性气体。还在氙气环境下于0.3 MPa和298 K下进行了一些实验。环境中的惰性气体量逐渐增加，直到不再点燃液滴为止。液滴的可燃性取决于重力水平以及环境中的惰性气体。抑制燃烧所需的惰性气体的量在降低的重力下通常比正常重力高，并且氙的使用需要相对于氦气或二氧化碳明显更高的摩尔分数以抑制燃烧。通常，增加惰性气体的量会降低燃烧速率。数据表明，环境气体的输送特性在确定液滴的可燃性和燃烧行为方面起着重要作用。与使用丙醇小滴获得的其他实验数据进行比较表明，小滴的可燃性和燃烧特性也会受到燃料类型的影响。

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