3 edition of Rotational and vibrational nonequilibrium effects in rarified, hypersonic flow found in the catalog.
Rotational and vibrational nonequilibrium effects in rarified, hypersonic flow
|Statement||Iain D. Boyd.|
|Series||NASA-CR -- 182559., NASA contractor report -- NASA CR-182559.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Hypersonic Nonequilibrium Flows documents recent, unprecedented scientific advances in the field of nonequilibrium processes for aerospace applications. These advances have been driven primarily by interest in space access and exploration, or in developing military technologies involving hypersonic flight regimes. The vibrational relaxation of carbon monoxide was studied under conditions of rapid nonequilibrium expansion by using a shock tunnel to generate a nozzle flow with stagnation temperatures and pressures of –°K and 5–15 atm., respectively. The vibrational temperature of the CO in the supersonic region of the nozzle was obtained from Cited by:
Physico - Chemical Modelling in Nonequilibrium Hypersonic Flow Around Blunt Bodies, Aeronautics and Astronautics, Max Mulder, IntechOpen, DOI: / Available from: Ghislain Tchuen and Yves Burtschell (September 12th ).Cited by: 5. The stagnation enthalpy, MJ/kg, is high enough for nonequilibrium effects to be important. The high-speed flow generates an oblique shock at the nose and a bow shock where the flow encounters the wide base. Just upstream of the junction of the slender and wide parts of the cone, the two shocks by:
Spatial linear stability of a hypersonic shear layer with nonequilibrium thermochemistry L. Massa1,a and J. M. Austin2 1Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, Texas , USA 2Department of Aerospace Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois , USA Received 31 January . The Ohio State University Nonequilibrium Thermodynamics Laboratories • Generation and sustaining of stable high-pressureweakly ionized plasmas • High-speed flow control by nonequilibrium plasmas / MHD • Ignition, combustion, and flameholding by nonequilibrium plasmas • Molecular gas lasers • Kinetics of gases, plasmas, and liquids at extreme File Size: 4MB.
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In an attempt to close the gap between experiments and simulations, Nompelis et al.  examined the effect of vibrational non-equilibrium on the heat transfer rate in hypersonic double-core flow. Rotational and Vibrational Nonequilibrium in a Low Rotational and vibrational nonequilibrium effects in rarified flow over a cylinder.
Vibrational and rotational nonequilibrium effects are typically included in CFD simulations of high enthalpy hypersonic flows through the use of separate vibrational, rotational and translational temperatures, although often a.
T tr translational and rotational temperature, K T v vibrational temperature, K T ve vibrational-electronic temperature, K u,v,w ow velocity components, m/s reaction rate coe cient, m3/particle/s ˆ e electron density, kg/m3 ˆ s density of species s, kg/m3 ˆ ow density, kg/m3 e electron viscous stress, Pa I.
Introduction Recently, there has been increased interest both in the development Cited by: 4. EFFECTS OF TWO VIBRATION-DISSOCIATION COUPLING MODELS ON NONEQUILIBRIUM HYPERSONIC FLOW OF NITROGEN OVER A WEDGE By Fred R.
DeJarnette Langley Research Center Langley Station, Hampton, Va. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION ~~ For sale by the Clearinghouse for Federal Scientific and Technical.
(translational, rotational, vibrational, or electronic) of the atoms and molecules in the gas flow. The ac-commodation is manifested through collisions among the atoms, molecules, ions, and electrons within the gas and the accommodation time is determined by the frequency with which effective collisions Size: 3MB.
experiments and hypersonic-vehicle flights at altitudes from 60 to km. The nonequilibrium, equilibrium and “frozen” flow regimes have been examined for various physical and chemical processes in air, including excitation of translational, rotational and vibrational degrees of molecular freedom,Cited by: 1.
The results of 2-D numerical simulations of hypersonic flow of a single diatomic gas, namely Nitrogen and a binary inert mixture of two gases (which are constituents of air namely N2, O2, Ar) past a 2-D blunt body in rotational nonequilibrium from low to high Knudsen Numbers are obtained using the Wang-Chang Uhlenbeck equation or the.
T1 - Linear stability of hypersonic flow in thermochemical nonequilibrium. AU - Hudson, Mary L. AU - Chokani, Ndaona. AU - Candler, Graham V. PY - /1/1. Y1 - /1/1. N2 - For flight at high Mach numbers, thermal and chemical nonequilibrium may exist in the mean flow and thus affect the stability of the by: From the results of master equations and the post-normal shock calculations, it is recommended that the rotational nonequilibrium of N2 should be treated as a.
The results of 2-D numerical simulations of non-equilibrium hypersonic flow of a diatomic gas, e.g., nitrogen past a 2-D blunt body at low to high Knudsen Numbers are presented. The flow field is computed using the Generalized Boltzmann (or the Wang-Chang Uhlenbeck ) Equation (GBE) for Kn varying from to Cited by: 8.
The MPC method is able to simulate steady-state, hypersonic flow that is in thermal (rotational and vibrational) nonequilibrium. It is parallelized for distributed memory systems using dynamic domain decomposition with scaled efficiency remaining above 80% for typical near-continuum 2D and axi-symmetric flows.
In the present study, flight regimes of hypersonic vehicles are identified in which the lack of thermal equilibrium between the vibrational-electronic and the electron translational energy modes plays an important role in the determination of the flow field character.
Detailed analysis of vibrational nonequilibrium of molecular oxygen in shock-heated flow. Physical Review Fluids, Vol. 2, Issue. 12, Physical Review Fluids, Vol. 2, Issue.
12, CrossRefCited by: Calculation of the flow of a viscous gas in a hypersonic nozzle with allowance for the departure from vibrational equilibrium M.
Muchnaya 1 Fluid Dynamics vol pages – () Cite this articleCited by: 1. The Nonequilibrium Gas and Plasma Dynamics Laboratory (NGPD) at the Aerospace Engineering Department of the University of Michigan is headed by Professor Iain Boyd and performs research of nonequilibrium gases and plasmas involving the development of physical models for various gas systems of interest, numerical algorithms on the latest supercomputers, and the.
Nozzle flow with vibrational nonequilibrium: Authors: Heinbockel, J. H.; Landry, J. drop in temperature along with a relaxation time for the vibrational degree of freedom to achieve equilibrium with the rotational-translation degree of freedom.
That is, we assume that the temperature change upon passing through the throat is so great. Key w or ds: DSMC, Hypersonic Flow, Rareﬁeld Flow, Non-Equilibrium Effects, Backward-Facing Step, Reentry.
Ab str ac t. An exploratory computational investigation was made on backward-facing steps in a rareﬁed hypersonic ﬂow. The effect of the step back-face height on the thermal non-equilibrium was examined.
Presents the principles of aerothermodynamics in nonequilibrium hypersonic flow regimes, covering theory, application and surface phenomena. Chapters 1 to 5 explain how to develop computational fluid dynamics (CFD) techniques for computing Describes the interaction between the fluid flow and the high temperature phenomena experienced in the 5/5(3).
Strongly Coupled Computation of Material Response and Nonequilibrium Flow for Hypersonic Ablation Alexandre Martin,University of Michigan - Ann Arbor translational, rotational and vibrational-electronic heat uxes vector.
Moreover, h is the species enthalpy. Physico - Chemical Modelling in Nonequilibrium Hypersonic Flow Around Blunt Bodies 3 The results present in this chapter were obtained using an improved version of the time marching Navier-Stokes code CARBUR, originally developed at IUSTI Marseille.
The code has been extensively tested in the past[13 16], and it s used here for the solutions of the. ".J ELSEVIER Chemical Physics () Chemical Physics Nonequilibrium distributions of rotational and energies in a free-jet expansion H.
Hulsman Physics Department, UIA, University of Antwerp, B Wilrijk, Belgium Received 5 December vibrational Abstract The occupations of various rovibrational levels of Na2 molecules in a free jet of Ar Cited by: 3.E. SMITH AND C. PARK T a b l e 5 shows, comparing the frozen and equilibrium solutions, that vibrational real gas effects can change the nozzle exit flow properties significantly though for the example chosen (20 = 10°), the non-equilibrium solution shows that only the translational temperature is altered by: 2.The Computational Modelling of High-Temperature Gas Effects with Application to Hypersonic Flows By Rowan John Gollan Bachelor of Engineering, Honours I A thesis submitted for the degree of Doctor of Philosophy at The University of Queensland in June Principal Advisor: Doctor Peter A.
Jacobs Associate Advisor: Professor Sean C. Smith.