TY - GEN
T1 - Simulation of radiation generated by chemical reactions in weakly ionized shock waves using DSMC
AU - Zhu, Tong
AU - Liy, Zheng
AU - Levin, Deborah A.
N1 - Publisher Copyright:
© 2014, American Institute of Aeronautics and Astronautics Inc. All rights reserved.
PY - 2014
Y1 - 2014
N2 - In this work, we simulate the radiation from the NO and N+2systems and compare with the shock tube experiments in air by Gorelov.1The related shock speeds are high enough to have produced a peak translational temperature of˜20,000 K or even higher, providing enough energy to ionize some of the ow species. In the current work, we simulate ionized normal shock ows by implementing appropriate ionization models in a 11 species air (N, O, N2, O2, NO, N+, O+, N+2, O+2, NO+and e-) in DSMC. Electron impact and heavy particle impact excitation for NO is studied using the Quasi-Steady-State (QSS) approximation to compute the NO(A2Σ+) and the N+2(B2Σ+u) state number densities. Line-by-line calculation of the spectra is performed using the NEQAIR2 code to obtain radiation in the wavelength range ofλ= 235±7 and 391:4±0:2 nm. For shock speeds above 7 km/s, the currently calculated radiation are in better agreement with the experimental data than that in our eariler work,3 but are still about 2~6 times lower than the experiments. For the N+2radiation good agreement with the experimental data is obtained for shock speeds above 9 km/s.
AB - In this work, we simulate the radiation from the NO and N+2systems and compare with the shock tube experiments in air by Gorelov.1The related shock speeds are high enough to have produced a peak translational temperature of˜20,000 K or even higher, providing enough energy to ionize some of the ow species. In the current work, we simulate ionized normal shock ows by implementing appropriate ionization models in a 11 species air (N, O, N2, O2, NO, N+, O+, N+2, O+2, NO+and e-) in DSMC. Electron impact and heavy particle impact excitation for NO is studied using the Quasi-Steady-State (QSS) approximation to compute the NO(A2Σ+) and the N+2(B2Σ+u) state number densities. Line-by-line calculation of the spectra is performed using the NEQAIR2 code to obtain radiation in the wavelength range ofλ= 235±7 and 391:4±0:2 nm. For shock speeds above 7 km/s, the currently calculated radiation are in better agreement with the experimental data than that in our eariler work,3 but are still about 2~6 times lower than the experiments. For the N+2radiation good agreement with the experimental data is obtained for shock speeds above 9 km/s.
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M3 - Conference contribution
AN - SCOPUS:84938340900
T3 - 52nd Aerospace Sciences Meeting
BT - 52nd Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 52nd Aerospace Sciences Meeting 2014
Y2 - 13 January 2014 through 17 January 2014
ER -