A state-of-the-art review of pulse combustion: Principles, modeling, applications and R&amp;D issues

Meng, Xin; Jong, Wiebren de; Kudra, Tadeusz

doi:10.1016/j.rser.2015.10.110

Cited by 80 publications

(51 citation statements)

References 62 publications

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“…Turbulent pulsatile injection (puff) [1] and continuous swirling injection (swirling jet) [2] are two ways of flow momentum delivery used in combustion applications to enhance fueloxidiser mixing. Individual pulsatile injection involves the formation of vortex-ring-like structure [3] with an isolated coherent bubble propagating downstream by its self-induced velocity while evolving and being dissipated [4].…”

Section: Introductionmentioning

confidence: 99%

The Formation and Evolution of Turbulent Swirling Vortex Rings Generated by Axial Swirlers

Gan

Liu

2019

Flow Turbulence Combust

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The present work investigates the formation process and early stage evolution of turbulent swirling vortex rings, by using planar Particle Image Velocimetry (PIV) and Large Eddy Simulation (LES). Vortex rings are produced in a piston-nozzle arrangement with swirl generated by 3D-printed axial swirlers in experiments. Idealised solid-body rotation is applied in LES to evaluate the effect of nozzle exit velocity profile in experiments. The Reynolds number (Re) based on the nozzle diameter D and the slug velocity U 0 in the nozzle is 20,000. The swirl number S generated ranges from 0 (zero-swirl vortex ring) and 1.1, covering the two critical swirl numbers previously identified in a swirling jet. Both PIV and LES results show that the formation number F decreases linearly as S increases, with the maximum F ≈ 2.6 at S = 0 (produced by the swirler with straight vanes) and minimum F = 1.9 at S = 1.1. The corresponding maximum attainable circulation in the nozzle axis parallel plane also diminishes with increasing S. Evolution of compact rings produced by a stroke ratio L/D = 1.5 reveals that circulation decay rate is largely proportional to S. The trajectory of the vortex core in the axial direction, hence the ring axial propagation velocity, decreases as S, while that in the radial direction and the radial propagation velocity, increase with S. An empirical scaling function is proposed to scale these variables.

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Section: Introductionmentioning

confidence: 99%

The Formation and Evolution of Turbulent Swirling Vortex Rings Generated by Axial Swirlers

Gan

Liu

2019

Flow Turbulence Combust

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“…It has been shown that pulsejets exhibit two main modes of oscillations: quarter-wave tube and Helmholtz resonator. 28 Additionally, within a given pulsejet operating cycle, it has been conceded that the device could behave like a half-wave tube owing to the valves being open for a finite time to allow for reactants injection. 25 Despite this class of combustors existing for multiple decades, there are still considerable unknowns regarding its operation, including the issue of emissions.…”

Section: Pulsejetmentioning

confidence: 99%

A review of pollutants emissions in various pressure gain combustors

Anand

Gutmark

2019

International Journal of Spray and Combustion Dynamics

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Recent years have witnessed a significant growth in the advancement and study of various unsteady combustors because of the prospective stagnation pressure gain offered by them. The pressure gain combustion produced by this class of combustors is poised to produce a step-change increase in the thermodynamic efficiency of gas-turbine engines. The current manuscript is oriented toward presenting a review on the pollutant emission characteristics of these devices; specifically, studies done so far on wave rotor combustors, pulsejet combustors, pulse detonation combustors, and rotating detonation combustors are evaluated. Because of the inherent fluid dynamic unsteadiness peculiar to pressure gain combustion devices, their emissions behavior is not well understood, and is notably different from the more conventional, steady combustors. The global view provided herein is expected to further the understanding of pressure gain combustion systems and ascertain the practicality of implementing them in real-world applications.Â Time in mode hr ð ÞOf the above terms, the time of operation cannot be altered since it is mission specific. This implies that

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“…Reactor is easy to scale, very energy-efficient, can combust stoichiometric fuel and air mixtures and is suitable for the production of powders in nanometric range because of acoustically driven droplet size reduction [20,21]. Up to now, it has been used mainly in the synthesis of oxide materials [22,23], therefore the synthesis of a material which demands a reducing environment is a special challenge.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Spectroscopic characterization of LiFePO4 as cathode material for Li-ion battery prepared in the pulse thermo-acoustic reactor

Lazarević

Križan

et al. 2019

SCI SINTER

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Lithium iron phosphate (LiFePO 4 ) is a cathode material for the rechargeable-lithium batteries. In this paper is presented a novel method of fabrication carbon-coated LiFePO 4 in a pilot reactor built according to the principles of the thermo-acoustic burner of Helmholtztype. Crystalline powder with a high percentage of LiFePO 4 was synthesized by incomplete combustion, i.e. in the reductive atmosphere, and calcined at 700 °C for 6 h. The obtained samples were characterized by X-ray diffraction, IR and Raman spectroscopy. The aim of this study was to demonstrate the production of the high-quality lithium-ion cathode material by the incomplete combustion. The synthesis of LiFePO 4 is completed during calcination and an ordered structure is attained. Fast synthesis in the reactor (less than 2 s) is achieved due to the reduction in the size of reactant's particles and a huge number of collisions owing to their strong turbulent flow associated with explosive combustion.

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A state-of-the-art review of pulse combustion: Principles, modeling, applications and R&D issues

Cited by 80 publications

References 62 publications

The Formation and Evolution of Turbulent Swirling Vortex Rings Generated by Axial Swirlers

The Formation and Evolution of Turbulent Swirling Vortex Rings Generated by Axial Swirlers

A review of pollutants emissions in various pressure gain combustors

Spectroscopic characterization of LiFePO4 as cathode material for Li-ion battery prepared in the pulse thermo-acoustic reactor

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