Effects of ozone addition and LTC progression on detonation of O\(_{3}\)-enhanced DME–O\(_{2}\)

IF 1.7 4区 工程技术 Q3 MECHANICS
M. C. Brown, E. L. Belmont
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引用次数: 1

Abstract

The effects of ozone addition and low-temperature chemistry (LTC) progression on DME/O\(_{2}\) detonations are evaluated with experimental detonation velocity and cell size measurements and one-dimensional ZND simulations. For \( \phi = 1.2\) and \(P_{\textrm{o}}= 22.7\) kPa, detonations are experimentally investigated over a range of ozone enhancement levels (0.0–1.6-mol%), initial reactant temperatures (293 K and 468 K), and LTC progression times (250–6000 ms). A 33-K gas temperature rise from LTC heat release is observed for mixtures with 1.0-mol% ozone enhancement and initial temperature of 468 K, suggesting a limited extent of LTC progression in this study. Experiments showed minimal detonation velocity dependence on ozone enhancement level or LTC progression despite the increased radical pool. Average cell size is found to decrease 15–30% with 1.6-mol% ozone addition, indicating a greater reactant mixture sensitivity to detonation. To estimate the cell size, a center-of-exothermic-length induction length is defined and used with an empirical correlation to calculate a singular cell size when multiple thermicity peaks are present in ZND modeling. This approach shows good agreement with experimental findings. Cell size dependence on LTC progression is found to have a statistically insignificant variance for LTC progression times at the temperatures used in this study.

Abstract Image

臭氧添加和LTC进程对O \(_{3}\) -增强DME-O爆轰的影响\(_{2}\)
通过实验爆轰速度和电池尺寸测量以及一维ZND模拟,评估了臭氧添加和低温化学(LTC)进展对DME/O \(_{2}\)爆轰的影响。对于\( \phi = 1.2\)和\(P_{\textrm{o}}= 22.7\) kPa,实验研究了在臭氧增强水平(0.0 - 1.6 mol)范围内的爆炸%), initial reactant temperatures (293 K and 468 K), and LTC progression times (250–6000 ms). A 33-K gas temperature rise from LTC heat release is observed for mixtures with 1.0-mol% ozone enhancement and initial temperature of 468 K, suggesting a limited extent of LTC progression in this study. Experiments showed minimal detonation velocity dependence on ozone enhancement level or LTC progression despite the increased radical pool. Average cell size is found to decrease 15–30% with 1.6-mol% ozone addition, indicating a greater reactant mixture sensitivity to detonation. To estimate the cell size, a center-of-exothermic-length induction length is defined and used with an empirical correlation to calculate a singular cell size when multiple thermicity peaks are present in ZND modeling. This approach shows good agreement with experimental findings. Cell size dependence on LTC progression is found to have a statistically insignificant variance for LTC progression times at the temperatures used in this study.
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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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