Abstract
Calculations of the flow of the mixture 0.94 CO2+0.05 N2+0.01 Ar past the forward portion of segmentai bodies are presented. The temperature, pressure, and concentration distributions are given as a function of the pressure ahead of the shock wave and the body velocity. Analysis of the concentration distribution makes it possible to formulate a simplified model for the chemical reaction kinetics in the shock layer that reflects the primary flow characteristics. The density distributions are used to verify the validity of the binary similarity law throughout the shock layer region calculated.
The flow of a CO2+N2+Ar gas mixture of varying composition past a spherical nose was examined in [1]. The basic flow properties in the shock layer were studied, particularly flow dependence on the free-stream CO2 and N2 concentration.
New revised data on the properties of the Venusian atmosphere have appeared in the literature [2, 3] One is the dominant CO2 concentration. This finding permits more rigorous formulation of the problem of blunt body motion in the Venus atmosphere, and attention can be concentrated on revising the CO2 thermodynamic and kinetic properties that must be used in the calculation.
The problem of supersonic nonequilibrium flow past a blunt body is solved within the framework of the problem formulation of [4].
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Abbreviations
- V∞:
-
body velocity
- ε:
-
shock wave standoff
- ℛ:
-
universal gas constant
- ϰ:
-
ratio of “frozen” specific heats
- hRt∞/m∞ :
-
enthalpy per unit mass
- P∞ :
-
pressure
- ρ ∞ :
-
density
- T∞ :
-
temperature
- m∞ :
-
molecular weight
- cp :
-
specific heat at constant pressure
- γ(X):
-
concentration of component X (number of particles in unit mass)
- R:
-
body radius of curvature at the stagnation point
- ωj :
-
rate of j-th chemical reaction
- Pρ ∞V∞ 2 :
-
pressure
- ρ ρ ∞ :
-
density
- TT∞ :
-
temperature
- mm∞ :
-
molecular weight
Literature cited
V. P. Stulov and L. I. Turchak, “Nonequilibrium chemical reactions in the shock layer for flow of a mixture of CO2, N2, and Ar past a sphere”, Izv. AN SSSR. MZhG, vol. 4, no. 5 (1969).
V. S. Avduevskii, N. F. Borodin, V. V. Kuznetsov, A. I. Livshits, M. Ya. Marov, V. V. Mikhnevich, M. K. Rozhdestvenskii, and V. A. Sokolov, “Temperature, pressure, and density of the atmosphere of Venus from data of Venera-4 automatic interplanetary station measurements”, Dokl. AN SSSR, vol. 179, no. 2 (1968).
R. A. Schiffer, “Engineering models of the Venus atmosphere based on an interpretation of recent space vehicle observations of Venus”, AIAA Paper, no. 69-51 (1969).
V. P. Stulov and G. F. Telenin, “Nonequilibrium supersonic airflow past a sphere”, Izv. AN SSSR, Mekhanika, no. 1 (1965).
V. P. Stulov and L. I. Turchak, “Supersonic flow past blunt bodies in the presence of fast nonequilibrium processes”, Izv. AN SSSR. MZhG, vol. 2, no. 5 (1967).
M. G. Lebedev, V. B. Minostsev, G. F. Telenin, and G. P. Tinyakov, “Approximate method for accounting for the effect of real gas properties in hypersonic flow past segmental bodies”, Izv. AN SSSR. MZhG, vol. 4, no. 2 (1969).
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Translated from Izv. AN SSSR. Mekhanika Zhidkosti i Gaza, Vol. 5, No. 2, pp. 67–72, March–April, 1970.
The author thanks V. P. Stulov for guidance in this study.
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Turchak, L.I. Supersonic nonequilibrium flow past segmental bodies of a mixture simulating the atmosphere of venus. Fluid Dyn 5, 231–235 (1970). https://doi.org/10.1007/BF01080238
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DOI: https://doi.org/10.1007/BF01080238