Examination of a possibility of non-conventional use of alkaline admixture for ionization of atmospheric gases

Kuranov, Alexander; Чайка, М. П.; lonikh, Y.

doi:10.2514/6.2001-2952

Cited by 3 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, at low temperatures where conductivity is insignificant for the unseeded gas, the theory shows that the seeded gas achieves a dramatic increase of as much as 3 orders in magnitude increase in electrical conductivity. Alkali seeding has been suggested by various authors [5,6,16] as a means of increasing the electrical conductivity of high-temperature gases, within the context of hypersonic vehicle and ground test applications, due to the low ionization potential of alkali salts.…”

Section: Literature Surveymentioning

confidence: 99%

Electrical conductivity channel for a shock tube

Liu

Wilson

2005

Meas. Sci. Technol.

View full text Add to dashboard Cite

The design of an electrical conductivity measurement channel for a shock tube is described. This measurement channel is used for the study of weakly ionized, high-enthalpy flows of gases seeded with alkali salts. The theory for determining the dimensions of the measurement channel and the electrical power supply for the channel is based on Ohm's law. Data are shown which demonstrate that the channel performs well. However, the measured electrical conductivity was one or two orders less than theoretical values. The current traces for each case show that the peak current occurred behind the contact surface, which indicates that some of the seed was entrained behind the test gas originally in the driven tube. An analysis of the effect of Joule heating on the measured conductivity was conducted. The result of increased temperature due to Joule heating in the measurement channel is believed to be minimal. Reasons for the discrepancy are given.

show abstract

Section: Literature Surveymentioning

confidence: 99%

Electrical conductivity channel for a shock tube

Liu

Wilson

2005

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The detailed mechanisms by which oxygen affects the ionization and recombination phenomena are beyond the scope of this paper. Ionization phenomena in a nitrogensodium system have been briefly discussed in [35].…”

Section: Experiments At Zero Oxygenmentioning

confidence: 99%

Influence of N–O chemistry on the excitation of alkali metals by a non-transferred DC plasma jet

Häyrinen¹,

Oikari²,

Hernberg³

2003

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Excitation of Na(3p) and K(4p) states by a high velocity non-transferred direct current plasma jet was studied. A turbulent nitrogen plasma jet was discharged into an atmosphere consisting of nitrogen and oxygen, laden with trace amounts of alkali. The line reversal temperatures of Na and K depend on the molar fraction of oxygen and may deviate considerably from the gas temperature. The reaction pressure was 0.1 MPa. The measured line reversal temperatures were reproduced by a simple chemical model. At temperatures near 2000 K non-equilibrium is caused by association of nitrogen atoms by the Zeldovich mechanism, which affects the vibrational temperature of nitrogen molecules. Near 1000 K excitation may also take place due to a chemiluminescent mechanism between alkali metals and ozone.

show abstract