Spectroscopic temperature measurements in high temperature gases and plasmas

Lapworth, K. C.

doi:10.1088/0022-3735/7/6/001

Cited by 18 publications

(15 citation statements)

References 22 publications

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“…[2][3][4][5][6] In flames, rotational temperature is very close to the kinetic temperature, due to the quick transfer between translational and rotational energies. 7 In this way, rotational temperature measurement is as a good indicative of flame temperature.…”

Section: Introductionmentioning

confidence: 98%

Determination of liquefied petroleum flame temperatures using emission spectroscopy

Carinhana¹,

Barreta²,

Rocha³

et al. 2008

J. Braz. Chem. Soc.

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A espectroscopia de emissão foi utilizada na determinação da temperatura de chamas pré-misturadas de GLP. Investigou-se a emissão natural de radicais CH * em três diferentes condições de queima: razão estequiométrica de combustível/oxidante, excesso de combustível (chama rica) e excesso de oxidante (chama pobre). O valor médio obtido para a temperatura rotacional de CH * foi de 2845 70 K nas condições utilizadas nos experimentos. Esse valor não variou significativamente com os demais tipos de chama e é compatível com os cálculos de temperatura adiabática dos sistemas estudados. Essa temperatura também é concordante com resultados obtidos por via indireta, utilizando-se o método de linha reversa de sódio, que consiste em uma técnica bem estabelecida e independente da emissão natural. Temperaturas vibracionais de ca. 4600 K foram calculadas, indicando que o tempo de vida do CH * não é suficiente para que o equilíbrio entre os modos rotacionais e vibracionais seja estabelecido.Emission spectroscopy was used in the temperature determination of LPG (liquefied petroleum gas) premixed flames. Natural emission of CH * radicals was investigated in flames under three different burning conditions: fuel/oxydizer stoichiometric ratio, fuel excess (rich flame), and oxidizer excess (lean flame). An average value of 2845 70 K was obtained for CH * rotational temperature in the set up used in the experiments. This value did not show significant change with the type of flame analyzed and it is compatible with the calculated adiabatic flame temperatures of the investigated systems. This temperature value also agrees with that determined by an indirect measurement, using the sodium line reversal method, which is independent from the radical natural emission and well established in literature. Vibrational temperatures of ca. 4600 K were calculated, indicating that the CH * lifetime is insufficient for the establishment of an equilibrium state between the rotational and vibrational modes.

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Section: Introductionmentioning

confidence: 98%

Determination of liquefied petroleum flame temperatures using emission spectroscopy

Carinhana¹,

Barreta²,

Rocha³

et al. 2008

J. Braz. Chem. Soc.

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“…Increasing the gas temperature means increasing the speed of particle motions. In a spectroscopic measurement [16,17] Unfortunately, the detonation progresses so fast that even with the very high-speed camera in its highest frame speed regime the timing of images was difficult. International Journal of Aerospace Engineering and others forward) can both increase and decrease the recorded light wavelength-and this is visible in the spectrogram as broadening of the basic line.…”

Section: Spectroscopic Measurement Of Temperaturementioning

confidence: 99%

Generating Plasma by Cumulative Detonation in a Combustion Chamber

Šonský

Tesař

2019

International Journal of Aerospace Engineering

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All combustion processes in present-day engineering applications are of the deflagration type. This character limits achievable values of parameters, such as the highest reached temperature and the corresponding degree of gas ionisation. If it were possible to increase the parameter values and reach the plasmatic state, a number of potentially useful combustion applications might be improved—like propulsion or electricity generation. Authors demonstrate a combustion chamber with detonation-type combustion that can reach, by cumulative implosion, extreme temperatures of generated thermal plasma.

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“…Many optical techniques like speckle shearing interferometry, moiré deflectometry, laser-induced fluorescence, lateral shearing interferometry, and spectroscopy have been used to measure the temperature distribution of the flames. [7][8][9][10][11][12][13][14] The spectral distribution of gases that are involved in the combustion process is exhibited in Figure 3a. There are several emission peaks, the highest ones belonging to C 2 .…”

Section: I/imentioning

confidence: 99%