Flame turbulences recorded at 1 kHz using planar laser induced fluorescence upon hot band excitation of OH radicals

Paa, W.; Müller, D.; Stafast, H.; Triebel, W.

doi:10.1007/s00340-006-2500-y

Cited by 39 publications

(10 citation statements)

References 7 publications

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“…in reacting flows is critical for understanding the performance and emissions of powergeneration and propulsion systems. Recently, several research groups have employed highrepetition-rate planar laser-induced fluorescence (PLIF) to investigate combustion intermediates in turbulent reacting flows using continuously pulsed diode-pumped solid state (DPSS) laser technology [1][2][3][4][5][6][7]. Laser system requirements include tunable ultraviolet (UV) output, narrow spectral bandwidth for efficient frequency conversion and excitation of combustion intermediates, high repetition rate for investigation of transient phenomena, short pulse width for discrimination against background interferences, and high pulse energies for planar measurements.…”

Section: Introductionmentioning

confidence: 99%

“…The low pulse energy ultimately restricts the number of flow parameters that can be measured and inhibits the use of diagnostic techniques such as Raman scattering, Rayleigh scattering, laser-induced incandescence, and PLIF of some key fuel tracers and combustion species. Hence, only a few combustion species have been investigated, and the maximum repetition rate is typically ~10 kHz because of the limited laser energy of current laser hardware [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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show abstract

“…UV laser pulses generated by frequency tripling or quadrupling of all-solidstate lasers can be used to excite fuel-tracers such as acetone [33], biacetyl [34] or combustion intermediates such as OH [35]. In a different approach, frequencydoubled radiation from these all-solid-state lasers can be used to pump tunable dye lasers.…”

Section: Instrumentation Suitable For High-speed Diagnosticsmentioning

confidence: 98%

“…The data was used to temporally track the fuel distribution in a direct-injection IC engine near the spark plug. Paa et al [35] used an all-solid-state Yb:YAG disk laser system operated at 343 nm and 1 kHz repetition rate to excite the hot band transition A 2 + v = 0 ← X 2 v = 1 of OH. With single-pulse energies of 3.7 mJ they were able to produce a reasonable SNR despite the low fluorescence quantum yields.…”

Section: Literature Review Of Planar High-speed Plif and Piv In Combumentioning

confidence: 99%

New Perspectives on Turbulent Combustion: Multi-Parameter High-Speed Planar Laser Diagnostics

Böhm

Heeger

Gordon

et al. 2010

Flow Turbulence Combust

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Over the past three decades laser combustion diagnostics have guided an improved understanding of turbulent combustion processes. Until recently, this was based on statistically independent sampling using sampling rates much slower than typical integral time-scales of turbulent flames. Recent developments in laser and camera technology enabled an increase in sampling rates by more than three orders of magnitudes. Using these new instruments for particle image velocimetry (PIV) and planar laser-induced fluorescence (PLIF) at high sampling rates (high-speed diagnostics) allowed the resolution of integral time-scales of turbulent flames. This statistically dependent sampling is increasingly used to temporally track transients in turbulent combustion, such as flame extinction, ignition, flashback and cycle-tocycle variations in IC engines. The simultaneous application of flow and scalar field measurements makes insights into these transients possible that were not when using statistically independent sampling with low data acquisition rates. Conditioning on distinct flame features with high-speed diagnostics enables the inclusion of time as an additional dimension. This paper reviews the emerging field of multi-parameter, high-speed, planar laser diagnostics in combustion applications. The benefit of high data acquisition rates in turbulent combustion applications is discussed in detail as well as requirements and constraints imposed by the time-scales of the investigated phenomenon are addressed. Recent developments in laser and detector hardware

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“…The OH field was thus imaged at a rate of 8 kHz and then 33 kHz in combination with additional planar diagnostics [4,5]. Other approaches for OH PLIF, however, are feasible, and more recently the use of a tunable, frequency-tripled Yb:YAG disk laser and intensified complementary metal-oxidesemiconductor (CMOS) detector have been demonstrated [6]. Combining the CMOS camera with diode-pumped solid-state lasers has spurred continued improvements in repetition rate and provided an opportunity for long-duration measurements not limited to a few images [7].…”

Section: Introductionmentioning

confidence: 98%

Continuous hydroxyl radical planar laser imaging at 50 kHz repetition rate

et al. 2014

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This study demonstrates high-repetition-rate planar laser-induced fluorescence (PLIF) imaging of hydroxyl radicals (OH) in flames at a continuous framing rate of 50 kHz. A frequency-doubled dye laser is pumped by the second harmonic of an Nd:YAG laser to generate laser radiation near 283 nm with a pulse width of 8 ns and rate of 50 kHz. Fluorescence is recorded by a two-stage image intensifier and complementary metal-oxide-semiconductor camera. The average power of the 283 nm beam reaches 7 W, yielding a pulse energy of 140 μJ. Both a Hencken burner and a DC transient-arc plasmatron are used to produce premixed CH₄/air flames to evaluate the OH PLIF system. The average signal-to-noise ratio for the Hencken burner flame is greater than 20 near the flame front and greater than 10 further downstream in a region of the flame near equilibrium. Image sequences of the DC plasmatron discharge clearly illustrate development and evolution of flow features with signal levels comparable to those in the Hencken burner. The results are a demonstration of the ability to make high-fidelity OH PLIF measurements at 50 kHz using a Nd:YAG-pumped, frequency-doubled dye laser.

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Flame turbulences recorded at 1 kHz using planar laser induced fluorescence upon hot band excitation of OH radicals

Cited by 39 publications

References 7 publications

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

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

New Perspectives on Turbulent Combustion: Multi-Parameter High-Speed Planar Laser Diagnostics

Continuous hydroxyl radical planar laser imaging at 50 kHz repetition rate

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