Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0 MPa

Hayakawa, Akihiro; Yamagami, Tomohisa; Takeuchi, Kai; Higuchi, Yasuhiro; Kudo, Taku; Gao, Yi; Hochgreb, Simone; Kobayashi, Haruo

doi:10.1016/j.proci.2018.08.009

Cited by 7 publications

(8 citation statements)

References 21 publications

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“…The burner nozzle consisted of 211 holes (diameter of 0.04 cm) drilled inside a circular area with a diameter of 1.6 cm. The details of the burner have been reported in previous studies (Takeuchi et al, 2018;Hayakawa et al, 2019). The multi-hole burner was placed inside a chamber for the high-pressure experiments.…”

Section: Mckenna and Multi-hole Burnermentioning

confidence: 99%

“…The temperature calculation results were within 5% of the measurements obtained using CARS (Prucker et al, 1994) under the McKenna burner experimental conditions. The temperature measurements of the multi-hole burner can be found in previous studies (Takeuchi et al, 2018;Hayakawa et al, 2019). However, the experimental temperature verification is still under development for combustion at extreme flame temperatures.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Owing to the intense chemiluminescence, a part of the OH distribution signal in the vicinity of the injector was lost. In contrast, Higuchi et al (2019) has managed to obtain OH-PLIF with an S/N of over 4 under up to 7.0 MPa in a gaseous jet flame. This was achieved by using the OH(2,0) band (A 2 ←X 2 ) excitation method to capture the OH signal while eliminating the intense OH(0,0) (A 2 →X 2  ) chemiluminescence emitted near the signal wavelengths in the conventional LIF method.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Higuchi

Nunome

Takada

et al. 2022

JTST

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Combustion measurements using laser diagnostics are vital for experimentally revealing both qualitative and quantitative flame characteristics. This paper focuses on the application of the quantitative OH laser-induced fluorescence (OH-LIF) method for high-pressure and high-temperature flames. Under high-pressure conditions, the intense OH chemiluminescence drastically decreases the signal to noise ratio (S/N). However, OH(2,0) band excitation is an alternative method to the typical OH(0,0) or OH(1,0) band excitation LIF under high-pressures. OH(2,0) band LIF sufficiently maintains the S/N under high-pressure because the OH fluorescence can be detected away from the peak OH chemiluminescence wavelength. In addition, the bi-directional LIF method is known as a quantitative OH concentration measurement that can ignore the quenching factor. Therefore, this study proposed a quantitative OH concentration measurement by combining the OH(2,0) band LIF and bidirectional LIF methods for high-pressure and high-temperature flames. First, an H2/air premixed flame created by a McKenna burner under atmospheric pressure was used to validate the quantitative OH(2,0) band bidirectional LIF method. Furthermore, a CH4/O2/N2 oxygen-enriched premixed flame created by a multi-hole calibration burner was used to verify the method under high-pressure (~0.5 MPa) and high temperature (~2900 K) conditions. A comparison of the experimental and numerical results revealed that the calculated OH concentrations were within the experimental uncertainty for the McKenna burner configuration. The experimental OH concentration results under high-pressure conditions deviated approximately 10%-20%, but they were also in good correlation with the calculation. In addition, the qualitative correlations with equivalence ratio and pressure variation were also acceptable. Although further consideration of the method is desirable for high-pressure turbulent flames, the results in this study showed that the OH(2,0) band bi-directional LIF method is feasible for measuring OH concentration in high-pressure and high-temperature flames.

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Section: Mckenna and Multi-hole Burnermentioning

confidence: 99%

Section: Numerical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Higuchi

Nunome

Takada

et al. 2022

JTST

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“…Unlike many other diagnostic techniques, LIGS has shown great potential for applications in high pressure environments 5 , where the signal intensity increases with increasing pressure. Both thermal and electrostrictive LIGS have been applied for temperature measurements in heated gas 4 , 10 – 12 , in flames 4 , 13 – 16 and in engines 17 – 19 .…”

Section: Introductionmentioning

confidence: 99%

Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption

Ruchkina

Hot

Ding

et al. 2021

Sci Rep

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Laser-induced grating spectroscopy (LIGS) is for the first time explored in a configuration based on the crossing of two focused femtosecond (fs) laser pulses (800-nm wavelength) and a focused continuous-wave (cw) laser beam (532-nm wavelength). A thermal grating was formed by multi-photon absorption of the fs-laser pulses by $$\hbox {N}_{{2}}$$ N 2 with a pulse energy around 700 $$\upmu $$ μ J ($$\sim $$ ∼ 45 TW/$$\hbox {cm}^{2}$$ cm 2 ). The feasibility of this LIGS configuration was investigated for thermometry in heated nitrogen gas flows. The temperature was varied from room temperature up to 750 K, producing strong single-shot LIGS signals. A model based on the solution of the linearized hydrodynamic equations was used to extract temperature information from single-shot experimental data, and the results show excellent agreement with the thermocouple measurements. Furthermore, the fluorescence produced by the fs-laser pulses was investigated. This study indicates an 8-photon absorption pathway for $$\hbox {N}_{{2}}$$ N 2 in order to reach the $$\hbox {B}^{3}\Pi _{g}$$ B 3 Π g state from the ground state, and 8 + 5 photon excitation to reach the $$\hbox {B}^{2}\Sigma _{u}^{+}$$ B 2 Σ u + state of the $$\hbox {N}_{2}^{+}$$ N 2 + ion. At pulse energies higher than 1 mJ, the LIGS signal was disturbed due to the generation of plasma. Additionally, measurements in argon gas and air were performed, where the LIGS signal for argon shows lower intensity compared to air and $$\hbox {N}_{{2}}$$ N 2 .

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“…Laser‐induced grating spectroscopy (LIGS) has emerged in recent decades as a promising candidate for temperature measurements in combustion. The LIGS signal is rich in information, as the shape of the signal simultaneously holds information on temperature, [ 19–22 ] pressure, [ 21,23 ] velocity, [ 24–27 ] and molecular relaxation rates. [ 28–30 ] In particular, LIGS has great potential for temperature measurements in high‐pressure environments, since unlike most other laser techniques, the signal intensity and the precision in the temperature measurement improve at higher pressures.…”

Section: Introductionmentioning

confidence: 99%

Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments

Hot

Sahlberg

Aldén

et al. 2021

J Raman Spectroscopy

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We present an in-depth investigation of laser-induced grating spectroscopy (LIGS) for temperature measurements in practical applications using a narrow-band dye laser with 760 nm wavelength and a pulse duration of 8 ns as the source for the pump beams creating the laser-induced grating. The pump laser wavelength was set to be either resonant with the R Q 5 ð Þ transition from the b 1 Σ + g υ 0 = 0 ð Þ X 3 Σ − g υ 00 = 0 ð Þ band of O 2 for generation of thermal LIGS or nonresonant for generation of purely electrostrictive LIGS. Signals were generated in ambient air as well as in high-pressure or high-temperature dry air mixtures. Pump laser irradiances up to 11 GW/cm 2 were used, which resulted in strong electrostrictive contribution to the overall LIGS signals at atmospheric pressure, with a low thermal contribution due to the weak absorption by the singlet O 2 b 1 Σ + g , v 0 = 0. The advantage and disadvantage of thermal or electrostrictive LIGS for temperature measurements are discussed, as well as potential applications in high-pressure environments. Furthermore, the precision of the temperature measurement is discussed by comparing different analysis methods.

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Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0 MPa

Cited by 7 publications

References 21 publications

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption

Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments

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Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0 MPa

Cited by 7 publications

References 21 publications

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Quantitative OH concentration measurement using OH(2,0) band bi-directional LIF method for high-pressure and high-temperature symmetrical flames

Laser-induced thermal grating spectroscopy based on femtosecond laser multi-photon absorption

Investigation of laser‐induced grating spectroscopy of O2 for accurate temperature measurements towards applications in harsh environments

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Quantitative measurement of temperature in oxygen enriched CH4/O2/N2 premixed flames using Laser Induced Thermal Grating Spectroscopy (LITGS) up to 1.0 MPa

Investigation of laser‐induced grating spectroscopy of O₂ for accurate temperature measurements towards applications in harsh environments