Influence of fuel inhomogeneity on detonation wave propagation in a rotating detonation combustor

IF 1.7 4区 工程技术 Q3 MECHANICS
P. Raj, J. Meadows
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引用次数: 0

Abstract

Rotating detonation combustor (RDC) is a form of pressure gain combustion, which is thermodynamically more efficient than the traditional constant-pressure combustors. In most RDCs, the fuel–air mixture is not perfectly premixed and results in inhomogeneous mixing within the domain. Due to discrete fuel injection locations, local pockets of rich and lean mixtures are formed in the refill region. The objective of the present work is to gain an understanding of the effects of reactant mixture inhomogeneity on detonation wave structure, wave velocity, and pressure profile. To study the effect of mixture inhomogeneity, probability density functions of fuel mass fractions are generated with varying standard deviations. These distributions of fuel mass fractions are incorporated in 2D reacting simulations as a spatially/temporally varying inlet boundary condition. Using this methodology, the effect of mixture inhomogeneity is independently investigated to determine the effects on detonation wave propagation and RDC performance. As mixture inhomogeneity is increased, detonation wave speed, detonation efficiency, and potential for pressure gain all decrease, ultimately leading to the separation of the reaction zone from the shock wave.

Abstract Image

燃料不均匀性对旋转爆燃燃烧器中爆燃波传播的影响
旋转爆燃燃烧器(RDC)是一种增压燃烧形式,与传统的恒压燃烧器相比,其热力学效率更高。在大多数 RDC 中,燃料-空气混合物并不是完全预混合的,这导致了区域内的不均匀混合。由于燃料喷射位置不连续,在加注区域会形成局部的富混合物和贫混合物。本研究的目的是了解反应物混合物不均匀性对爆轰波结构、波速和压力曲线的影响。为研究混合物不均匀性的影响,生成了标准偏差不同的燃料质量分数概率密度函数。这些燃料质量分数分布被纳入二维反应模拟,作为空间/时间变化的入口边界条件。利用这种方法,可独立研究混合物不均匀性的影响,以确定其对爆轰波传播和 RDC 性能的影响。随着混合物不均匀性的增加,爆轰波速度、爆轰效率和增压潜力都会降低,最终导致反应区与冲击波分离。
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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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