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Afanasyev A.A.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza
Fluid Dynamics | Year: 2014

The discontinuity surfaces (shock waves) that arise in nonisothermal carbon dioxide-water binary mixture flows through a porous medium are considered. In the plane of determining parameters the discontinuity adiabats are investigated and their evolutionarity diagrams are plotted. It is shown that one of the adiabat branches corresponds to the displacement fronts at which there are no temperature jumps and phase transitions and the other branch to temperature jumps and phase transition fronts. The adiabat branches may intersect at a point that corresponds to the Jouguet point for the parameters both ahead of and behind the finite-amplitude jump. It is shown that in the neighborhood of this double Jouguet point the adiabat behavior differs from the classical adiabat behavior at single Jouguet points. © 2014 Pleiades Publishing, Ltd. Source


Sazonov V.S.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza
Fluid Dynamics | Year: 2014

The parameters of emitting shock waves generated upon high-velocity rarefied-gas flow impingement on a plane barrier are investigated with account for the reflecting capacity of the barrier. In the case of aluminum plasma impingement the unsteady radiation-gasdynamic flows are numerically calculated using the Lax-Wendroff scheme at different values of the radiation reflection coefficient. The radiation transport is accounted for in the gray gas approximation. In the quasi-stationary stage the structure of compressed shock layer on the wall is considered in the radiant heat conduction approximation. © 2014 Pleiades Publishing, Ltd. Source


Ivashnev O.E.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza
Fluid Dynamics | Year: 2014

A model for simulation of critical flows of boiling liquids is proposed, which takes into account the existence of two vapor phases: α-bubbles "attached" to the channel walls and β-bubbles moving in the flow. The model takes into account the possibility of breakdown of both groups of the bubbles due to both the Kelvin-Helmholtz instability caused by the flow around the bubbles and the Rayleigh-Taylor instability induced by the increase in the expansion rate of the vapor-water mixture. It is shown that the experiments on depressurization of high-pressure vessels can be explained by assuming that the initial boiling centers are located only on the walls, and in the flow core the bubbles appear only after the injection of the fragments of broken wall bubbles into the flow. The experimental oscillograms are compared with the calculated curves obtained using the model proposed and the models which take into account only one instability mode, i.e. the Kelvin-Helmholtz or Rayleigh-Taylor instability. The waves which accompany the vessel depressurization process are described. © 2014 Pleiades Publishing, Ltd. Source


Volkova T.I.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza | Naletova V.A.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza
Fluid Dynamics | Year: 2014

The static shape of the surface of a finite magnetic fluid volume between horizontal plates is investigated theoretically. The nonuniform magnetic field is generated by a horizontal line conductor with current, which is placed above the upper plate. The variational problem of minimum energy relative to plane surface perturbations is considered for a simply connected magnetic fluid volume. The problem is solved for arbitrary magnetic fields in the noninductive approximation with account for the gravity force and surface tension. Unstable solutions are found. The possibility of stepwise behavior in response to quasi-static changes of the current in the conductor is investigated for the surface shape of a finite magnetic fluid volume. © 2014 Pleiades Publishing, Ltd. Source


Golovanov A.N.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza | Pakhomov F.M.,Izvestiya Academii Nauk Mekhanika Zhidkosti i Gaza
Fluid Dynamics | Year: 2014

The aerodynamic parameters of an oscillating cone in unsteady axisymmetric supersonic flow are investigated on the basis of the inviscid perfect gas model both in the absence and in the presence of strong air injection from its flat end into the shock layer. © 2014 Pleiades Publishing, Ltd. Source

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