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首页> 外文期刊>Journal of Astrophysics & Aerospace Technology >Modulated Thermoacoustic Singularities on Lifted Premixed Flames
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Modulated Thermoacoustic Singularities on Lifted Premixed Flames

机译：调制的热声奇迹在升上预混火焰上

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摘要

Efficient propulsion development is an area of major interest in space industry. Chemical propulsion-oriented rockets and space systems are well known to encounter acoustic instabilities. The modified heat fluxes, owing to wall temperature, reaction rates and non-linear heat transfer are observed. The thermoacoustic instabilities significantly result in reduced combustion efficiency leading to uncontrolled rocket engine performance, serious hazards to systems, assisted testing facilities, enormous loss of resources and every year substantial amount of money is being spent to prevent them. Appreciable work had been carried out in the past leading to a progressive stand however, the complexity of the problem has prevented a comprehensive solution. Present work attempts to fundamentally understand the mechanisms governing the thermoacoustic combustion in rocket engines using a simplified experimental setup comprising of a butane cylinder and an impinging acoustic source. The RL-10 engine generates a noise of 180 Db at its base. Systematic studies are carried out for varying fuel flow rates, acoustic levels and observations are made on the flames. The work is expected to yield a good physical insight into the development of acoustic devices that could effectively enhance combustion efficiency leading to safer missions and better fire safety.
机译：高效推进发展是太空业对主要兴趣的领域。众所周知，化学推进火箭和空间系统是遇到声学稳定性的。观察到壁温，反应速率和非线性传热的改性热通量。热声无限度显着导致导致无法控制的火箭发动机性能，对系统严重危害，辅助检测设施，资源巨大损失以及每年的燃烧效率，以及每年的燃烧效率都花费了预防。过去已经开展了可观的工作，导致渐进的立场，问题的复杂性阻止了全面的解决方案。目前的工作试图利用包括丁烷圆筒和撞击声源的简化实验装置，从根本上揭示了在火箭发动机中控制热声燃烧的机制。 RL-10发动机在其基础上产生180 dB的噪声。对不同燃料流速进行系统研究，对火焰进行声学水平和观察。这项工作有望产生良好的身体洞察声学设备，可以有效提高导致更安全的任务和更好的消防安全的燃烧效率。

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