Journal ArticleDOI
Validation of Multitemperature Nozzle Flow Code
Chul Park,Seung-Ho Lee +1 more
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TLDR
In this paper, a computer code nozzle in n-temperatures (NOZNT) was proposed to calculate one-dimensional flows of partially dissociated and ionized air in an expanding nozzle.Abstract:
A computer code nozzle in n-temperatures (NOZNT), which calculates one-dimensional flows of partially dissociated and ionized air in an expanding nozzle, is tested against three existing sets of experimental data taken in arcjet wind tunnels. The code accounts for the differences among various temperatures, i.e., translational-rotational temperature, vibrational temperatures of individual molecular species, and electron-electronic temperature, and the effects of impurities. The experimental data considered are (1) the spectroscopic emission data; (2) electron beam data on vibrational temperature; and (3) mass-spectrometric species concentration data. It is shown that the impurities are inconsequential for the arcjet flows, and the NOZNT code is validated by numerically reproducing the experimental data.read more
Citations
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Proceedings ArticleDOI
Numerical Simulation of Magnetohydrodynamic Flow Control in Reentry Flight with Three-Temperature Model
Yusuke Imamura,Takayasu Fujino +1 more
Proceedings ArticleDOI
Nonequilibrium plasma flow properties in arc-heated wind tunnels
TL;DR: In this article, an integrated analysis model to simulate various-scale arc-heated flows with high accuracy was developed, where the turbulent flow field was described by the Navier-Stokes equations with a multitemperature model, which was tightly coupled with electric-field and radiation-field calculations.
Journal ArticleDOI
Improvement of Potential Drop Predictions for Plasma Wind Tunnels by Cathode Sheath
TL;DR: In this paper, the Richardson constant was replaced by the Boltzmann constant, which is the same as the Stefan-Boltzmann Constant (SBC) constant, and was used for the first time in the literature.
Proceedings ArticleDOI
Modeling of Electronically Excited Oxygen in O2-Ar Shock Tube Studies
Kyle M. Hanquist,Iain D. Boyd +1 more
Journal ArticleDOI
Nonequilibrium shock layer in large-scale arc-heated wind tunnel
TL;DR: In this article , the rotational temperature of the NO molecules in the shock layer was 6620 ± 350 K, whereas that in the free jet was much lower at 770 ± 60 K.
References
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Journal ArticleDOI
Systematics of Vibrational Relaxation
TL;DR: In this article, a large number of data points for the vibrational relaxation time (pτv in atm sec) of simple systems have been logarithmically plotted vs (T°K)-⅓.
Book
Nonequilibrium hypersonic aerothermodynamics
TL;DR: In this paper, nonequilibrium phenomena in hypersonic flows are examined on the basis of theoretical models and selected experimental data, in an introduction intended for second-year graduate students of aerospace engineering.
Journal ArticleDOI
Review of chemical-kinetic problems of future NASA missions, II: Mars entries
TL;DR: A number of chemical-kinetic problems related to phenomena occurring behind a shock wave surrounding an object flying in the earth atmosphere are discussed in this paper, including the nonequilibrium thermochemical relaxation phenomena behind a wave surrounding the flying object.
Journal ArticleDOI
Vibrational Relaxation of Anharmonic Oscillators with Exchange‐Dominated Collisions
TL;DR: In this paper, an analytic expression is given for the distribution maintained by the vibration-vibration mechanism of a simple harmonic oscillator, which reduces to the usual Boltzmann-like distribution defined by a single vibrational temperature.
Book ChapterDOI
Survey of Rate Constants in the N/H/O System
Ronald K. Hanson,S. Salimian +1 more
TL;DR: A detailed survey of high-temperature N/H/O reactions and rate constants can be found in this paper, including reactions for which limited or no rate data are available currently as well as reactions which have undergone critical reviews previously or in this study.