Axial and radial temperature profiles in a weakly ionized argon jet

1970 ◽  
Vol 48 (16) ◽  
pp. 1845-1857 ◽  
Author(s):  
F. J. Morgan ◽  
R. W. Nicholls
Keyword(s):  
Electronic Excitation ◽  
Plasma Jet ◽  
Electronic Excitation Energy ◽  
Temperature Profiles ◽  
Radial Temperature ◽  
Radial Profiles ◽  
Weakly Ionized ◽  
Axial Behavior ◽  
Electrical Probe ◽  
Weakly Ionized Plasma

Diagnostic studies were made on a supersonic (Mach 2.5) weakly ionized plasma jet in argon. Electrical probe techniques were used in conjunction with spectroscopic and photographic methods. The results indicate a fairly uniform axial behavior of temperature, but the radial profiles show considerable variation. Temperature measurements made by different methods disagree sufficiently to show a probable lack of equilibrium between translational, rotational, vibrational, and electronic excitation energy modes.

scholarly journals BASIC PLASMA FEATURES OF PLANAR JET FORMED BY CAPACITIVE RF DISCHARGE IN ATMOSPHERE PRESSURE ARGON

2019 ◽  
pp. 155-158
Author(s):  
V.Yu. Bazhenov ◽  
S.M. Gubarev ◽  
V.V. Tsiolko
Keyword(s):  
Visible Spectrum ◽  
Plasma Jet ◽  
Rf Discharge ◽  
Atmosphere Pressure ◽  
Planar Jet ◽  
Weakly Ionized ◽  
Bremsstrahlung Emission ◽  
Basic Parameters ◽  
Planar Plasma ◽  
Weakly Ionized Plasma

Upgraded method of determining basic parameters of weakly ionized plasma by means of photometric study of bremsstrahlung emission continuum in visible spectrum range is described. Time-averaged spatial distributions of electron temperature and density in planar plasma jet formed by capacitive RF discharge in atmosphere pressure argon at the discharge glow in a low-current α-mode are experimentally obtained.

Simultaneous Measurements of Droplet Size, Temperature, and Velocity Using an Integrated Phase-Doppler/Rainbow Thermometer

2001 ◽  
Author(s):  
Matt O’ Donnell ◽  
Sumanta Acharya
Keyword(s):  
Refractive Index ◽  
Detailed Examination ◽  
Temperature Profiles ◽  
Droplet Temperature ◽  
Radial Temperature ◽  
Temperature Correlation ◽  
Simultaneous Measurements ◽  
Laser Diagnostic ◽  
The Mean ◽  
And Performance

Abstract This work summarizes efforts to determine the accuracy and performance characteristics of a new and novel laser diagnostic to measure instantaneous, in flight, droplet temperatures. The instrument uses the location of the rainbow peak to deduce the refractive index of the droplet, which in turn is related to the droplet temperature. Preliminary experiments were undertaken in order to understand the fundamental operating principles and limitations of the instrument. These experiments measured the temperature of an isothermal, single stream of monodisperse droplets. These measurements indicate that the mean refractive index can be measured with a standard deviation as low as 0.0001m. Once the operation of the refractometer was proved under isothermal conditions, the measurement of droplet temperatures in a swirl-stabilized combustor was performed. These measurements indicate that the strength of the rainbow signal is significantly hampered by the noise induced by the flame. Preliminary temperature measurements with the combustor equipped with 45° vanes showed relatively constant radial temperature profiles (∼55–60°C) at locations less than 2 inches from the nozzle exit. A detailed examination of the temperature correlation with velocity and diameter revealed that larger and faster moving droplets dominate the distributions. Thus, the smaller droplets that are suspected of having the highest temperatures are inadequately represented in the mean droplet temperature.

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