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http://dx.doi.org/10.3795/KSME-B.2010.34.3.245

Gas Temperature Measurement in Supersonic Flows by N2+ Emission Spectroscopy  

Shin, Ji-Chul (Dept. of Aerospace Engineering, Univ. of Ulasn)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.34, no.3, 2010 , pp. 245-250 More about this Journal
Abstract
The procedure for estimating the gas (rotational) temperature of an air discharge in supersonic flows is presented in detail. Since direct measurement of the temperature in a supersonic flow is difficult, a nonintrusive measurement was performed by optical emission spectroscopy based on the emission spectra of nitrogen molecular ions. A detailed explanation, including the equations for emission line intensity, is presented in order to understand the structure of the emission spectra of nitrogen molecular ions. Using the obtained representation for emission spectrum, a synthetic spectrum of the first negative system of $N_2^+$ is obtained, and it is compared with the experimentally measured spectrum. Within a relative error of approximately 6.8% for the overall band spectra, the synthetic and measured spectra agree well. In the case of a 25-mA DC air discharge in a supersonic (Mach 3) flow, the gas temperature profile shows an approximately linear variation and a peak temperature of approximately 350 K.
Keywords
Temperature Measurement; Optical Emission Spectroscopy; Supersonic Flow; DC Discharge;
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