From ignition to stable combustion in a cavity flameholder studied via 3D tomographic chemiluminescence at 20 kHz

Ma, Lin; Lei, Qingchun; Wu, Yue; Xu, Wenjiang; Ombrello, Timothy; Carter, Campbell D.

doi:10.1016/j.combustflame.2015.08.026

Cited by 77 publications

(12 citation statements)

References 39 publications

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“…The control of cavity-based flow in a supersonic duct is of significant fundamental and technological interest for aerospace science and industry as currently the cavity appears to be a major element of a supersonic flameholding scheme, [1,2,3,4,5] and references herewith. The flow structure in cavities is sensitive to the geometrical configuration and main flow parameters, including the texture of the boundary layer upstream of the cavity and the presence of compression/expansion waves impinging on the cavity area.…”

Section: Introductionmentioning

confidence: 99%

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Leonov

Houpt

Hedlund

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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This experimental work explores the physical processes related to an interaction of a nearsurface Quasi-DC (Q-DC) electrical discharge with supersonic airflow. The study is performed in the Supersonic Test Rig SBR-50 at the University of Notre Dame at Mach Number M = 2, stagnation pressure P0 = 0.9-2.6 Bar, stagnation temperature T0=300K, Reynolds Number ReL = 7-25 10 6 m -1 , test cell dimensions 76×76×610mm with 1º two walls divergence, and plasma power W= 5-16 kW. The plasma power and temperature are measured with current-voltage probes and optical emission spectroscopy. An unsteady pattern of interaction is depicted by high-speed image capturing. The result of the interaction is characterized by means of pressure measurements and schlieren visualization. It is demonstrated that the plasma generation causes the appearance of a wedge-shaped displacement layer and an oblique shock wave (SW). The strength of the SW is a rising function of the plasma power; the position of the impinged zone on the opposite wall can be electronically regulated. The resulting pressure amplification has been described for the configurations included; both a fixed SW generator and the plasma-based SW generator. It is considered that the Q-DC discharge may be employed for active control of duct-driven flows, cavity-based flow, and, finally, for control of ignition / flameholding in a supersonic combustor.

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Section: Introductionmentioning

confidence: 99%

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Leonov

Houpt

Hedlund

et al. 2016

47th AIAA Plasmadynamics and Lasers Conference

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“…Referencing just a few, the papers [1,[16][17][18][19][20] give an initial impression on the field of PAC applications. In recent years, a few schemes of plasma-based actuators for supersonic combustion have been tested for flameholding purposes at flow conditions where self-ignition of the fuel/air mixture is not realizable due to low air temperatures [1,[21][22][23][24][25][26]. These works demonstrated the potential of plasma-based techniques to improve combustion stability under supersonic flow conditions.…”

Section: Introductionmentioning

confidence: 99%

Electrically Driven Supersonic Combustion

Leonov

2018

Energies

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This manuscript reviews published works related to plasma assistance in supersonic combustion; focusing on mixing enhancement, ignition and flameholding. A special attention is paid for studies, which the author participated in person. The Introduction discusses general trends in plasma-assisted combustion and, specifically, work involving supersonic conditions. In Section 2, the emphasis is placed on different approaches to plasma application for fuel ignition and flame stabilization. Several schemes of plasma-based actuators for supersonic combustion have been tested for flameholding purposes at flow conditions where self-ignition of the fuel/air mixture is not realizable due to low air temperatures. Comparing schemes indicates an obvious benefit of plasma generation in-situ, in the mixing layer of air and fuel. In Section 3, the problem of mixing enhancement using a plasma-based technique is considered. The mechanisms of interaction are discussed from the viewpoint of triggering gasdynamic instabilities promoting the kinematic stretching of the fuel-air interface. Section 4 is related to the description of transitional processes and combustion instabilities observed in plasma-assisted high-speed combustion. The dynamics of ignition and flame extinction are explored. It is shown that the characteristic time for reignition can be as short as 10 ms. Two types of flame instability were described which are related to the evolution of a separation zone and thermoacoustic oscillations, with characteristic times 10 ms and 1 ms correspondingly.

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“…These studies require all the cameras in the same plane (co-planar). Ma et al 243,[255][256][257][258][259] modified the CT algorithms so the cameras can be located at arbitrary locations. Different algorithms such as ART algorithm and simulated annealing (SA) algorithm were selected for tomography reconstruction and flames from premixed, patterned McKenna flame ( Figure 15) to turbulent, diffusion Vshape flame (Figure 16).…”

Section: Tomography Techniquesmentioning

confidence: 99%

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

Ehn

Zhu

et al. 2017

Appl Spectrosc

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Gaining information of species, temperature, and velocity distributions in turbulent combustion and high-speed reactive flows is challenging, particularly for conducting measurements without influencing the experimental object itself. The use of optical and spectroscopic techniques, and in particular laser-based diagnostics, has shown outstanding abilities for performing non-intrusive in situ diagnostics. The development of instrumentation, such as robust lasers with high pulse energy, ultra-short pulse duration, and high repetition rate along with digitized cameras exhibiting high sensitivity, large dynamic range, and frame rates on the order of MHz, has opened up for temporally and spatially resolved volumetric measurements of extreme dynamics and complexities. The aim of this article is to present selected important laser-based techniques for gas-phase diagnostics focusing on their applications in combustion and aerospace engineering. Applicable laser-based techniques for investigations of turbulent flows and combustion such as planar laser-induced fluorescence, Raman and Rayleigh scattering, coherent anti-Stokes Raman scattering, laser-induced grating scattering, particle image velocimetry, laser Doppler anemometry, and tomographic imaging are reviewed and described with some background physics. In addition, demands on instrumentation are further discussed to give insight in the possibilities that are offered by laser flow diagnostics.

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From ignition to stable combustion in a cavity flameholder studied via 3D tomographic chemiluminescence at 20 kHz

Cited by 77 publications

References 39 publications

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Controllable Shock Wave Generation by Near-Surface Electrical Discharge

Electrically Driven Supersonic Combustion

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

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