Spontaneous initiation and development of hydrogen–oxygen detonation with ozone sensitization

Han, Wenhu; Liang, Wenkai; Wang, Cheng; Wen, Jennifer X.; Law, Chung K.

doi:10.1016/j.proci.2020.06.239

Cited by 17 publications

(2 citation statements)

References 30 publications

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“…As regards the influence of ozone on syngas and hydrogen combustion, there are only few studies in the literature [26][27][28][29][30][31][32], since the research interest in this area is only recently growing. Zhang et al [31] examined the effect of ozone addition on the flammability of 𝐶𝐶𝐶𝐶/𝐻𝐻 2 mixtures and found that ozone is able to extend the flammability limits.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on Laminar Flame Speed of Syngas in Air with Ozone Addition

D’Amato,

Magi,

Viggiano

2023

J. Phys.: Conf. Ser.

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In the context of energy and propulsion systems, in recent years engineering research has increased its efforts to develop more efficient technologies with a lower environmental impact. Specifically, new combustion systems have been investigated, such as ultra-lean combustion and Homogeneous Charge Compression Ignition (HCCI) combustion, and sustainable fuels have been employed. With respect to the latter option, syngas and hydrogen have emerged as attractive choices. However, the low specific energy of syngas and the presence of diluents can cause flame failure and instability. On the other hand, it is well known that ozone-assisted combustion enhances the Laminar Flame Speed (LFS), reduces the ignition delay time, and improves the flame stabilization of fuels such as methane, n-heptane and iso-octane, since it affects the chemistry in the Low Temperature Combustion (LTC) regime. In this context, the aim of the present work is to evaluate the effect of ozone on the LFS of syngas/ozone/air mixtures. Specifically, 1-D simulations have been carried out to compute the LFS of CO/H2 and CO/H2/N2 syngas mixtures. The model has been validated against experimental data available in the scientific literature by considering four different reaction mechanisms. Then, the model has been used to perform a parametric analysis by considering different conditions in terms of syngas composition (three different CO/H2 ratios) and equivalence ratio (from 0.5 to 5). The results show that the addition of 2500 ppm of ozone in air results in an increase in LFS for all equivalence ratios examined. The four different mechanisms give comparable results in terms of LFS and LFS increase for CO/H2 syngas, and are also able to predict ozone effect on LFS enhancement for CO/H2/N2 mixtures. Finally, the results show that the influence of ozone, in terms of LFS percentage increase, is greater for CO/H2 ultra lean mixtures with a lower CO/H2 ratio.

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Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on Laminar Flame Speed of Syngas in Air with Ozone Addition

D’Amato,

Magi,

Viggiano

2023

J. Phys.: Conf. Ser.

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“…Zhao [28] conducted experimental research on the low-temperature oxidation chemistry of dimethyl ether (DME), with ozone as an oxidant. Han [29] studied the effects of adding O 3 to an H 2 /O 2 mixture to investigate the changes in the initiation and propagation of detonation waves by using numerical simulations. Ozone has been utilized as an accelerant in partially accelerated and controlled combustion [30].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ozone Addition on Multi-Wave Modes of Hydrogen–Air Rotating Detonations

2023

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Ozone addition presents a promising approach for optimizing and regulating both combustion and ignition mechanisms. In Rotating Detonation Engines (RDEs), investigating the impact of ozone addition is particularly important due to the fact of their unique operating conditions and potential for improved efficiency. This study explores the influence of ozone concentration, total temperature, and equivalent ratio on the combustion characteristics of a hydrogen–air mixture infused with ozone. Utilizing the mixture as a propellant, the combustion chamber of a continuous rotating detonation engine is replicated through an array of injection ports, with numerical simulations conducted to analyze the detonation wave combustion mode. Our results show that an increase in total temperature leads to an increase in the number of detonation waves. Incorporating a minor quantity of ozone can facilitate the ignition process for the detonation wave. Increasing the ozone content can result in the conversion from a single-wave to dual-wave or multi-wave mode, providing a more stable combustion interface. A low ozone concentration acts as an auxiliary ignition agent and can significantly shorten the induction time. As the total temperature increases, the detonation propagation velocity and the peak heat release rate both decrease concurrently, which leads to a decline in the exit total pressure and an augmentation in the specific impulse. Employing ozone exerts a minimal impact on the detonation propagation and the overall propulsion performance. The requirement for ozone-assisted initiation differs noticeably between rich and lean combustion.

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

Brown

Belmont

2023

Shock Waves

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Spontaneous initiation and development of hydrogen–oxygen detonation with ozone sensitization

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 17 publications

References 30 publications

A Numerical Investigation on Laminar Flame Speed of Syngas in Air with Ozone Addition

A Numerical Investigation on Laminar Flame Speed of Syngas in Air with Ozone Addition

Effects of Ozone Addition on Multi-Wave Modes of Hydrogen–Air Rotating Detonations

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

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