Coupled Radiation-Gasdynamic Model for Stardust Earth Entry Simulation

2012 ◽  
Vol 49 (5) ◽  
pp. 875-888 ◽  
Author(s):  
S.T. Surzhikov ◽  
J. S. Shang
Keyword(s):  
Gasdynamic Model

Numerical and Experimental Investigations on Preload Effects in Air Foil Journal Bearings

2017 ◽  
Author(s):  
Marcel Mahner ◽  
Pu Li ◽  
Andreas Lehn ◽  
Bernhard Schweizer
Keyword(s):  
Reynolds Equation ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Compressible Fluids ◽  
Experimental Investigations ◽  
Hysteresis Curves ◽  
Numerical Predictions ◽  
Bearing Stiffness ◽  
Gasdynamic Model ◽  
Good Agreement

A detailed elasto-gasdynamic model of a preloaded three-pad air foil journal bearing is presented. Bump and top foil deflections are herein calculated with a nonlinear beamshell theory according to Reissner. The 2D pressure distribution in each bearing pad is described by the Reynolds equation for compressible fluids. With this model, the influence of the assembly preload on the static bearing hysteresis as well as on the aerodynamic bearing performance is investigated. For the purpose of model validation, the predicted hysteresis curves are compared with measured curves. The numerically predicted and the measured hysteresis curves show a good agreement. The numerical predictions exhibit that the assembly preload increases the bearing stiffness (in particular for moderate shaft displacements) and the bearing damping.

Gasdynamic model of dilute two-phase combustion fields

2012 ◽  
Vol 48 (5) ◽  
pp. 544-560 ◽  
Author(s):  
A. L. Kuhl ◽  
K. Balakrishnan
Keyword(s):  
Two Phase ◽  
Gasdynamic Model

Ionisationsmechanismus in der Relaxationszone schwach instationärer Stoßwellen in Argon und Krypton / Ionisation Mechanism in the Relaxation Zone oj Weakly Instationary Shock Waves in Argon and Krypton

1974 ◽  
Vol 29 (4) ◽  
pp. 568-576 ◽  
Author(s):  
G. Meinhold ◽  
F. Demmig ◽  
W. Bötticher
Keyword(s):  
Shock Waves ◽  
Shock Front ◽  
Electron Temperature ◽  
Excited States ◽  
Gas Temperature ◽  
Electron Collisions ◽  
Step Process ◽  
Gasdynamic Model ◽  
Excitation Processes ◽  
Additional Excitation

The primary ionisation relaxation up to electron densities of ne = 4·1013 cm-3 is investigated by means of 4 mm - microwave - interferometry. The values of the timedependent gas temperature Ta, and gas density na behind the shock front are calculated using a gasdynamic model which strictly takes into account the instationarity of the flow. From the results it is concluded that neither the familiar two step process dominated by atom collisions nor the assumption of additional excitation processes by electron collisions can fully describe the observed ionisation rates. There is evidence that both the ionisation rates and the electron temperature are influenced by transitions between the first four excited states due to superelastic electron collisions. As a result the electron temperature may even exceed the gas temperature.

Quasi-gasdynamic model for describing magnetogasdynamic phenomena

2018 ◽  
Vol 58 (8) ◽  
pp. 189-199
Author(s):  
B. Chetverushkin ◽  
◽  
V. Saveliev ◽  
A. Saveliev ◽  
◽  
...  
Keyword(s):  
Gasdynamic Model

Solar Wind-Comet Exosphere Interaction. 2. Could the Single-Fluid Gas-Dynamic Model be Applicable to the Rosetta Mission

2012 ◽  
Vol 42 (1) ◽  
pp. 71-90 ◽  
Author(s):  
M. Kartalev ◽  
P. Dobreva ◽  
V. Keremidarska ◽  
M. Dryer
Keyword(s):  
Solar Wind ◽  
Dynamic Model ◽  
Point Of View ◽  
Gas Dynamic ◽  
Rosetta Mission ◽  
Gasdynamic Model ◽  
Comet 67P

Solar Wind-Comet Exosphere Interaction. 2. Could the Single-Fluid Gas-Dynamic Model be Applicable to the Rosetta Mission The capabilities of a single fluid gasdynamic model of solar wind-comet exosphere interaction, presented in the accompanying (Keremidarska et al.) [23], are discussed from the point of view of its potential implementation in interpreting data, expected to be obtained by ROSETTA mission instruments in plasma environments of the comet 67P/Churyumov-Gerasimenko. As an exapmle, some model's predictions of the structure and parameters' distribution in the inner coma of P/Halley are presented and compared with Giotto measurements. Special attention is paid to a possible non-traditional interpretation of the magnetic cavity boundasry, registered by Giotto magnetometer. Possible model's applications are discussed for each of the main expected stages in the evolution of the comet 76P/CG environments during ROSETTA rendezvous with the comet.

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