Enhancement of blowout limit in a Mach 2.92 cavity-based scramjet combustor by a gliding arc discharge

Tian, Yifu; Zhu, Jiajian; Sun, Mingbo; Wang, Hongbo; Huang, Yuhui; Feng, Rong; Yan, Bo; Sun, Yongchao; Cai, Zun

doi:10.1016/j.proci.2022.07.101

Cited by 40 publications

(2 citation statements)

References 20 publications

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“…For this reason, researchers have studied the blends of hydrogen and other hydrocarbon fuels − and found that the combustion performance of the blends can meet the needs of industrial production, but the carbon emission problem is still inevitable. Pure ammonia is difficult to be used directly as a fuel owing to low reactivity and high ignition energy; thus, scholars have explored different methods to improve its combustion performance such as using plasmas − and adding highly reactive fuels to ammonia. Some studies , demonstrate that ammonia-hydrogen blends configured in reasonable proportions can fully utilize the advantages of the respective single fuels, thereby forming a promising composite fuel system.…”

Section: Introductionmentioning

confidence: 99%

Experiments on the Vented Ammonia–Hydrogen–Air Deflagrations under Various Hydrogen Volume Fractions

Huang,

Guo,

Mei

et al. 2024

Energy Fuels

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Although ammonia as a carbon-free fuel is regarded as an energy source worthy of significant development, how to address the shortcomings of its poor combustion properties has been a hot topic of research. Hydrogen enrichment is a promising solution to improve the combustion properties of ammonia, but at the same time, the potential explosion risk will inevitably be raised. In this paper, the effects of hydrogen volumetric fraction (χ) in NH 3 /H 2 on the NH 3 /H 2 /air deflagrations were experimentally investigated in a rectangular duct with an end-opening at an initial pressure and temperature of 101 kPa and 298 K, where χ was varied from 0.1 to 0.9. Results demonstrate that flame propagation and overpressure profiles inside and outside the chamber depend on χ. Buoyancy plays a significant role in flame propagation at χ = 0.1. More prominent deformation of the flame front propagating toward the closed end (CE) was observed in the experiments with higher χs. Helmholtz oscillations of the flame occurred in all tests, which resulted in pressure oscillations with a decreasing frequency as χ was increased. Acoustically enhanced combustion of NH 3 /H 2 /air remained at the CE, appeared when χ ≥ 0.7, and acoustic-type oscillations of the internal explosion overpressure and a pressure peak of p 2 formed in these tests. The amplitude of p 2 dropped as χ varied from 0.7 to 0.9. A proportional relationship between the highest explosion overpressure inside the chamber (p max ) and the square of the laminar burning velocity of NH 3 /H 2 /air (s l 2 ). When χ ≥ 0.3, a dominant pressure peak (p ext ) caused by the external explosion appeared in the external overpressure profiles, and its amplitude increased as χ varied from 0.3 to 0.9.

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Section: Introductionmentioning

confidence: 99%

Experiments on the Vented Ammonia–Hydrogen–Air Deflagrations under Various Hydrogen Volume Fractions

Huang,

Guo,

Mei

et al. 2024

Energy Fuels

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“…Plasma can support lean combustion by providing heat and radicals on very short timescales (∼ns − µs) [3,4]. Fast plasma processes give an edge to plasma-assisted combustion (PAC) over conventional flame stabilization mechanisms such as flow re-circulation by a bluff body or swirl, pilot flame stabilization, etc especially in high-speed propulsion engines such as scramjets and turbojets [5][6][7][8][9]. Another advantage of PAC is that it can have a higher energy efficiency of radical production than conventional thermal heating.…”

Section: Introductionmentioning

confidence: 99%

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

Patel,

Peelen,

van Oijen

et al. 2023

J. Phys. D: Appl. Phys.

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This work aims to find how coupled energy per pulse influences the ability of a pulsed dielectric barrier discharge (DBD) plasma to ignite fuel-lean methane–air flow. For that, experiments are performed on a custom-built DBD flow reactor with a variable dielectric thickness and the discharge is operated by bursts of 10 ns duration pulses at 3 kHz repetition rate. With an increase in dielectric thickness, we observe that the coupled energy per pulse decreases even though applied voltage conditions are similar and so more pulses are required to ignite the lean mixture. Interestingly, we observe a significant increase in the minimum ignition energy (MIE) with an increase in the thickness beyond 3 mm. Moreover, the ignition kernel growth rate is much slower in the thicker dielectric cases even though total energy coupling per burst is similar. This phenomenon is investigated further by evaluating plasma parameters using electrical and optical diagnostics. Effective dielectric capacitance, discharge current, and voltage drop across the gas gap are derived from an equivalent circuit analysis, whereas plasma gas temperature and effective reduced electric field ( E / N ) are estimated from optical emission spectroscopy. From these analyses, we conclude that a thicker dielectric limits the discharge current and so the plasma filament temperature. For more than 3 mm thick dielectric cases, the filament heating per pulse is too low to achieve strong enough plasma pulse-to-pulse coupling which eventually leads to higher MIE and slower ignition kernel growth rate or the inability to ignite at all.

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Research on mixing characteristics of scramjet combustor equipped with strut injector

Quan,

Chang,

Kong

et al. 2024

Applied Thermal Engineering

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Enhancement of blowout limit in a Mach 2.92 cavity-based scramjet combustor by a gliding arc discharge

Cited by 40 publications

References 20 publications

Experiments on the Vented Ammonia–Hydrogen–Air Deflagrations under Various Hydrogen Volume Fractions

Experiments on the Vented Ammonia–Hydrogen–Air Deflagrations under Various Hydrogen Volume Fractions

How pulse energy affects ignition efficiency of DBD plasma-assisted combustion

Research on mixing characteristics of scramjet combustor equipped with strut injector

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