An experimental investigation of the blowout process of a jet flame

Chao, Yei Chin; Chang, Yong; Wu, Chih Yung; Cheng, T. S.

doi:10.1016/s0082-0784(00)80228-3

Cited by 67 publications

(18 citation statements)

References 20 publications

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“…The third topic is blowoff of jet flames into quiescent or flowing environments. There is a very large literature on this topic [22][23][24][25][26][27][28][29], which is still a subject of some controversy -whether blowoff is controlled by a kinematic balance between turbulent flame speed propagation and reactant flow or flamelet extinction. The fourth topic is the interaction and potential coupling of combustion chamber acoustics and the blowoff phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Lean blowoff of bluff body stabilized flames: Scaling and dynamics

Shanbhogue

Husain

Lieuwen

2009

Progress in Energy and Combustion Science

531

206

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Section: Introductionmentioning

confidence: 99%

Lean blowoff of bluff body stabilized flames: Scaling and dynamics

Shanbhogue

Husain

Lieuwen

2009

Progress in Energy and Combustion Science

531

206

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“…While high-power, 10-ms-long burst durations open a variety of applications for PBL systems, it is of interest to further extend the burst sequence to study many low-frequency processes, including flame instabilities due to acoustic noise [25], blowout processes [26], and chemical kinetics-driven instabilities [27], which have characteristic frequencies as low as 20 Hz. Therefore, another order of magnitude increase in burst duration up to 100 ms is desirable to capture the full range of frequencies in reacting flows of practical interest.…”

Section: Introductionmentioning

confidence: 99%

All-diode-pumped quasi-continuous burst-mode laser for extended high-speed planar imaging

Slipchenko¹,

Miller²,

Roy³

et al. 2013

Opt. Express

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An all-diode-pumped, multistage Nd:YAG amplifier is investigated as a means of extending the duration of high-power, burst-mode laser pulse sequences to an unprecedented 30 ms or more. The laser generates 120 mJ per pulse at 1064.3 nm with a repetition rate of 10 kHz, which is sufficient for a wide range of planar laser diagnostics based on fluorescence, Raman scattering, and Rayleigh scattering, among others. The utility of the technique is evaluated for image sequences of formaldehyde fluorescence in a lifted methane-air diffusion flame. The advantages and limitations of diode pumping are discussed, along with long-pulse diode-bar performance characteristics to guide future designs. Keywordsfluorescence, laser diagnostics, methane, Q switched lasers, diode-pumping, future designs, image sequence, laser pulse sequences, long pulse, methane-air diffusion flames, performance characteristics, planar imaging Disciplines Mechanical Engineering CommentsThis article is from Optics Express 21 (2013) Abstract: An all-diode-pumped, multistage Nd:YAG amplifier is investigated as a means of extending the duration of high-power, burstmode laser pulse sequences to an unprecedented 30 ms or more. The laser generates 120 mJ per pulse at 1064.3 nm with a repetition rate of 10 kHz, which is sufficient for a wide range of planar laser diagnostics based on fluorescence, Raman scattering, and Rayleigh scattering, among others. The utility of the technique is evaluated for image sequences of formaldehyde fluorescence in a lifted methane-air diffusion flame. The advantages and limitations of diode pumping are discussed, along with long-pulse diode-bar performance characteristics to guide future designs.

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“…A large amount of previous work has been performed to investigate the mechanisms of LBO as equivalence ratio is reduced, with the general finding of a transition between stable flames and LBO that is characterized by an intermediate stage with large-scale unsteadiness, and local extinction and reignition events [10][11][12][13][14] . Bradley et al showed that the flame is stabilized by hot gas in both the inner and outer recirculation zones at steady combustion, whereas the unstable flame near LBO is stabilized only by the hot gas in the inner zone 12 .…”

mentioning

confidence: 99%

Sensing and Control of Combustion Instabilities in Swirl-Stabilized Combustors Using Diode-Laser Absorption

Li¹,

Zhou²,

Jeffries³

et al. 2006

42nd AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Thermoacoustic instability and lean blowout (LBO) are monitored in propane/air flames in a swirl-stabilized combustor using a novel tunable diode laser (TDL) sensor for gas temperature using wavelength-scanned laser absorption of two neighboring water vapor transitions near 1.4 μm. Although the gas composition and temperature are not uniform along the sensor line-of-sight, temperature oscillations and fluctuations are clearly identified in the FFT power spectra of the time-resolved data. Detailed experiments are conducted to optimize the position of the sensor line-of-sight in the flame for thermoacoustic instability and LBO sensing. The output of the sensor is used to suppress the thermoacoustic oscillations in a phase-delay feedback control system, and acoustic modulation of the intake air flow suppresses the temperature oscillations by more than 7dB. The low-frequency temperature fluctuations measured by the TDL sensor increase sharply as the flame approaches LBO. The intensity of these low-frequency fluctuations is used to detect the proximity to LBO, and can be used as a control variable for active LBO suppression without knowing the LBO fuel/air ratio limit. The TDL sensor results are compared with traditional pressure and emission sensors, and the TDL sensor is found to offer several advantages including better spatial resolution and insensitivity to background acoustic noise and flame emissions.

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An experimental investigation of the blowout process of a jet flame

Cited by 67 publications

References 20 publications

Lean blowoff of bluff body stabilized flames: Scaling and dynamics

Lean blowoff of bluff body stabilized flames: Scaling and dynamics

All-diode-pumped quasi-continuous burst-mode laser for extended high-speed planar imaging

Sensing and Control of Combustion Instabilities in Swirl-Stabilized Combustors Using Diode-Laser Absorption

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