腔室逐渐收缩时rdrre中的流动加速度

IF 1.7 4区 工程技术 Q3 MECHANICS
M. Ross, J. Burr, Y. Desai, A. Batista, C. Lietz
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引用次数: 1

摘要

旋转爆轰推进技术有潜力制造出体积小、效率高的发动机。然而,爆震动力学和燃烧室内部复杂的流场在很大程度上取决于几何形状;特别是,下游喷嘴的设计会影响燃烧室内部的动力学。在这项工作中,气态甲烷-氧气旋转爆轰火箭发动机的三维大涡模拟提出了两种几何形状。这些几何形状与先前在空军研究实验室进行的实验测试相匹配,选择这些几何形状是为了比较有和没有会聚-发散喷嘴的发动机运行情况。结果表明,在产生斜激波结构后,无缩窄腔内的流动超过1马赫,但增加4.4 \(^\circ \)会聚段后,只在喷管的发散段存在超声速流动。在燃烧室内计算了流动的形成焓,并证明了与燃烧室面积收缩相关的压力和爆轰结构的差异不会导致燃烧释放的能量发生显着变化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Flow acceleration in an RDRE with gradual chamber constriction

Flow acceleration in an RDRE with gradual chamber constriction

Rotating detonation propulsion technologies have the potential to create highly efficient engines in a small form factor. However, the detonation dynamics and complex flowfields inside the combustion chamber are greatly dependent on geometry; in particular, the downstream nozzle design affects dynamics inside the combustion chamber. In this work, three-dimensional large eddy simulations of a gaseous methane–oxygen rotating detonation rocket engine are presented for two geometries. The geometries match experimental tests previously conducted at the Air Force Research Laboratory and are chosen to compare engine operation with and without a converging–diverging nozzle. It is shown that flow in the unconstricted chamber exceeds Mach 1 behind the generated oblique shock structure, but that the addition of a 4.4\(^\circ \) converging section results in supersonic flow existing only in the diverging section of the nozzle. The formation enthalpy of the flow is calculated inside the chamber and demonstrates that the difference in pressures and detonation structures associated with the chamber area constriction do not result in a significant change in energy released through combustion.

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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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