Measurement of the Temperatures of Stationary Flames<sup>1</sup>

Loomis, A. G.; Perrott, G. St. J.

doi:10.1021/ie50226a006

Cited by 20 publications

(6 citation statements)

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“…Under most burner conditions, sodium electronic temperature can be assigned as translational system temperature. 30 An example of line reversal spectra can be seen in Figure 10. The signal reversal (emission to absorption) is observed at 10.5 V lamp voltages, corresponding to a calibrated temperature lamp of 2950 K. Figure 10 provide a good idea of the precision of the method.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

“…The chosen technique was line reversal method. 29,30 This method is based on the measurement of electronic temperature of ions inserted in flames. The most common is the Na + species.…”

Section: Temperature Calculationmentioning

confidence: 99%

Determination of liquefied petroleum flame temperatures using emission spectroscopy

Carinhana¹,

Barreta²,

Rocha³

et al. 2008

J. Braz. Chem. Soc.

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“…In the theoretical section of the paper, the analyses demonstrate that under conditions of constant pressure the flame would propagate a t a uniform speed. If, however, we apply a displacement to the system, i t is shown that vibrations are set up, and the equations ( I ) , ( z ) , (3) and (4) are deduced. The conditions under which these various equations apply are as follows :-( I ) When the vibrations are of small amplitude they are independent of the speed of propagation.…”

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“The vibratory movement” in flames

Ellis¹,

Morgan²

1932

Trans. Faraday Soc.

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“…All of these methods of measurement have been used in determining the temperature of continuous flame (11). It is here proposed to compare the last two methods as applied to a determination of flame temperature in an internal-combustion engine.…”

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confidence: 99%