Stochastic Equilibrium Analysis to Optimize Solid Propellant Combustion Gas Composition

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Quentin Michalski, Adrian Pudsey
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Abstract

Solid fuel ducted rockets operate with two-stage combustion. The first stage generates burnt products from the combustion of a fuel-rich solid propellant. In the second stage, those combustion products react with air and are ejected through a nozzle to produce thrust. The combustion efficiency of such a device strongly influences its performance and depends on the composition of the rich-fuel-burnt pyrolysis products. This study investigates the sensitivity of carbon, hydrogen, oxygen, and nitrogen (CHON) solid fuels’ burnt product composition to the fuel properties, composition, and heat of formation. The calculations are performed assuming adiabatic, isobaric chemical equilibrium on synthetic species. Existing species’ properties constrain the properties of the synthetic species. The trends of formation of the main species observed in gas generators, i.e., [Formula: see text], [Formula: see text], CO, [Formula: see text], [Formula: see text], [Formula: see text], and solid carbon, are presented. The sensitivity of the molar concentration ratio [Formula: see text] of [Formula: see text] to [Formula: see text] to the oxygen balance and propulsive properties is compared with an example of gas generator propellants. Recommendations for the possible optimization of fuel composition are formulated. For blends of the existing CHON species reported in the literature, it is shown that improving [Formula: see text] is only possible by degrading the specific impulse.
优化固体推进剂燃烧气体成分的随机平衡分析
固体燃料管道火箭采用两级燃烧。第一级燃烧富含燃料的固体推进剂,产生燃烧产物。在第二阶段,这些燃烧产物与空气发生反应,并通过喷嘴喷出,产生推力。这种装置的燃烧效率对其性能影响很大,并取决于富燃料燃烧热解产物的成分。本研究调查了碳、氢、氧和氮(CHON)固体燃料的燃烧产物成分对燃料特性、成分和形成热的敏感性。计算假定合成物种处于绝热、等压化学平衡状态。现有物种的特性制约着合成物种的特性。文中介绍了在气体发生器中观察到的主要物种,即[式:见正文]、[式:见正文]、CO、[式:见正文]、[式:见正文]、[式:见正文]和固体碳的形成趋势。以气体发生器推进剂为例,比较了[式:见正文]与[式:见正文]的摩尔浓度比[式:见正文]对氧平衡和推进性能的敏感性。提出了优化燃料成分的建议。对于文献中报道的现有 CHON 品种的混合物,研究表明只有通过降低比冲来改善[式:见正文]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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