An Experimental Study of Opposed Flame Spread along Various Thin Fuel Configurations in Microgravity

IF 1.3 4区 工程技术 Q2 ENGINEERING, AEROSPACE Microgravity Science and Technology Pub Date : 2024-11-14 DOI:10.1007/s12217-024-10147-3
Vipin Kumar, Prema Prescilla T, Amit Kumar, Akash Gupta, Payal Sharma
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Abstract

In the present study, opposed flow flame spread over several fuel configurations of thin cellulosic fuels are investigated experimentally in normal gravity and microgravity environments. The fuel is configured in different shapes, namely, planar, hollow cylindrical (circular duct), C channel, and L channel, with the help of specifically designed fuel sample holders. The flame spread phenomena are examined for each configuration in both normal gravity and microgravity environments under ambient conditions of 21% oxygen and 1 atm. pressure. The microgravity experiments are conducted using a 2.5 s drop tower facility. The flame spread rates are measured at various opposed flow speeds. The effective flow speed accounts for the induced reference buoyant flow speed and externally imposed flow. The flame spread rates for each configuration are plotted against the effective flow speed ranging from 10 cm/s to 40 cm/s. While there is a nonmonotonic increasing-decreasing flame spread rate trend with respect to the effective opposed flow speed for all configurations, the flame spread rate can vary significantly with changes in the configuration. The C-channel configuration shows the highest flame spread rate compared with the other configurations of the same scale and identical experimental conditions. The effect of fuel size on the flame spread rate is also investigated for the duct configuration. The flame spread rate is noted to increase with the increase in fuel diameter.

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微重力条件下各种稀薄燃料配置的对置火焰蔓延实验研究
本研究在正常重力和微重力环境下对几种燃料配置的薄纤维素燃料上的逆流火焰传播进行了实验研究。在专门设计的燃料样品架的帮助下,燃料被配置成不同的形状,即平面、空心圆柱形(圆形管道)、C 型通道和 L 型通道。在 21% 氧气和 1 个大气压的环境条件下,在正常重力和微重力环境中对每种配置的火焰蔓延现象进行了研究。微重力实验使用 2.5 秒落塔设施进行。火焰蔓延率是在不同的相对流速下测量的。有效流速考虑了诱导参考浮力流速和外部强加流。每种配置的火焰蔓延率都与 10 厘米/秒至 40 厘米/秒的有效流速相对应。虽然所有配置的火焰蔓延率与有效对向流速呈非单调的递增递减趋势,但火焰蔓延率会随着配置的变化而发生显著变化。与相同规模和相同实验条件下的其他配置相比,C 型通道配置的火焰蔓延率最高。对于管道配置,还研究了燃料大小对火焰蔓延率的影响。火焰蔓延率随着燃料直径的增加而增加。
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来源期刊
Microgravity Science and Technology
Microgravity Science and Technology 工程技术-工程:宇航
CiteScore
3.50
自引率
44.40%
发文量
96
期刊介绍: Microgravity Science and Technology – An International Journal for Microgravity and Space Exploration Related Research is a is a peer-reviewed scientific journal concerned with all topics, experimental as well as theoretical, related to research carried out under conditions of altered gravity. Microgravity Science and Technology publishes papers dealing with studies performed on and prepared for platforms that provide real microgravity conditions (such as drop towers, parabolic flights, sounding rockets, reentry capsules and orbiting platforms), and on ground-based facilities aiming to simulate microgravity conditions on earth (such as levitrons, clinostats, random positioning machines, bed rest facilities, and micro-scale or neutral buoyancy facilities) or providing artificial gravity conditions (such as centrifuges). Data from preparatory tests, hardware and instrumentation developments, lessons learnt as well as theoretical gravity-related considerations are welcome. Included science disciplines with gravity-related topics are: − materials science − fluid mechanics − process engineering − physics − chemistry − heat and mass transfer − gravitational biology − radiation biology − exobiology and astrobiology − human physiology
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