Techniques for Estimating Rotational and Vibrational Temperature in Nitrogen Arcjet Flow

Scott, Clayton; Blackwell, Harvel E.; Arepalli, Sivaram; Akundi, Murty A.

doi:10.2514/2.6369

Cited by 14 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This technique was successfully applied to rotational temperature measurements in a nonequilibrium recombining nitrogen/argon plasma at the exit of a 15 cm test-section (figure 1(b)) [8]. The rotational temperature was measured to be 4850±100 K, an accuracy far superior to that of other N + 2 rotational temperature measurement techniques (see for instance the review by Scott et al [12]).…”

Section: N +mentioning

confidence: 99%

Optical diagnostics of atmospheric pressure air plasmas

Laux

Spence

Kruger

et al. 2003

Plasma Sources Sci. Technol.

979

768

View full text Add to dashboard Cite

Atmospheric pressure air plasmas are often thought to be in local thermodynamic equilibrium owing to fast interspecies collisional exchange at high pressure. This assumption cannot be relied upon, particularly with respect to optical diagnostics. Velocity gradients in flowing plasmas and/or elevated electron temperatures created by electrical discharges can result in large departures from chemical and thermal equilibrium. This paper reviews diagnostic techniques based on optical emission spectroscopy and cavity ring-down spectroscopy that we have found useful for making temperature and concentration measurements in atmospheric pressure plasmas under conditions ranging from thermal and chemical equilibrium to thermochemical nonequilibrium.

show abstract

Section: N +mentioning

confidence: 99%

Optical diagnostics of atmospheric pressure air plasmas

Laux

Spence

Kruger

et al. 2003

Plasma Sources Sci. Technol.

979

768

View full text Add to dashboard Cite

show abstract

“…In practice, it is found that a small mismatch of the position of the spectral lines and the wavelength dependence of line width can lead to a large residue value when fitting the experimental spectrum with simulated one [31]. And the uncertainty is estimated to be about 10% [17,19,32]. In most cases, it is worse because the ambiguity of error origin results in the deterioration of the measurement accuracy.…”

Section: ( π → π )mentioning

confidence: 99%

Spectroscopic measurement of plasma gas temperature of the atmospheric-pressure microwave induced nitrogen plasma torch

Chen

2015

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

Atmospheric-pressure microwave induced N 2 plasma is diagnosed by optical emission spectroscopy with respect to the plasma gas temperature. The spectroscopic measurement of plasma gas temperature is discussed with respect to the spectral line broadening of Ar I and the various emission rotational-vibrational band systems of N 2 (B-A), N 2 (C-B) andIt is found that the Boltzmann plot of the selective spectral lines from ( ) + N B-X 2 at 391.4 nm is preferable to others with an accuracy better than 5% for an atmosphericpressure plasma of high gas temperature. On the basis of the thermal balance equation, the dependences of the plasma gas temperature on the absorbed power, the gas flow rate, and the gas composition are investigated experimentally with photographs recording the plasma morphology.

show abstract

“…1.362 × 10 7 s −1 for CN (B-X, 0-0), 1.124 × 10 7 s −1 for CN (B-X, 1-1), and 9.417 × 10 6 s −1 for CN (B-X, 2-2). Furthermore, as seen in figure 2(b), since the first negative system bands in the range from 426 to 428 nm are easily distinguished from each other and no spectral overlapping occurs with other spectral lines, the N 2 + (B-X, 0-1) bands are employed to determine the rotational temperature by fitting the spectra with the Lifbase program [40,41]. The thus obtained rotational temperature is around 5200 K and the value reduces to around 4500 K after the addition of ethanol into the afterglow.…”

Section: Methodsmentioning

confidence: 99%

Hydrogen production by decomposition of ethanol in the afterglow of atmospheric-pressure nitrogen microwave plasma torch

Niu¹,

Li²

2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

The atmospheric-pressure microwave plasma torch (MPT) is employed to produce hydrogen by decomposition of ethanol. The ethanol aerosol is injected directly into the early afterglow of a nitrogen plasma and the products are analyzed with Fourier Transformation Infrared Spectrometer (FT-IR) and Gas Chromatography (GC). Meanwhile, Optical Emission Spectroscopy (OES) is used to diagnose the plasma. The influencing factors on the hydrogen production are investigated with respect to the location of ethanol injection, ethanol feed rate, ethanol microdroplet size, absorbed microwave powers, total flow rate of carrier gas, and argon-to-N2 mixture ratio, respectively. And it is found that the excited species and high temperature plays the important roles in ethanol decomposition. In addition, the effect of gas flow pattern in reaction chamber on hydrogen production is analyzed with the aid of computational fluid dynamics (CFD) and the mechanism of ethanol decomposition by MPT is discussed. The achievements of hydrogen production in our experiment were reached with production rate up to 1309 L/h, energy yield up to 468 L/kWh, and hydrogen yield up to 95%, respectively.

show abstract

Techniques for Estimating Rotational and Vibrational Temperature in Nitrogen Arcjet Flow

Cited by 14 publications

References 6 publications

Optical diagnostics of atmospheric pressure air plasmas

Optical diagnostics of atmospheric pressure air plasmas

Spectroscopic measurement of plasma gas temperature of the atmospheric-pressure microwave induced nitrogen plasma torch

Hydrogen production by decomposition of ethanol in the afterglow of atmospheric-pressure nitrogen microwave plasma torch

Contact Info

Product

Resources

About