共查询到20条相似文献,搜索用时 15 毫秒
1.
M. A. Rydalevskaya 《Journal of Applied Mechanics and Technical Physics》1995,36(3):401-405
St. Petersburg State University, St. Petersburg 199004. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol.
36, No. 3, pp. 92–97, May–June, 1995. 相似文献
2.
St. Petersburg. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 5, pp. 13–18, September–October, 1994. 相似文献
3.
Effect of the obstacle size on the flow structure and the transient conditions arising in a supersonic underexpanded jet normally
impinging on a flat restricted obstacle is studied.
Baltic State Technical University, St. Petersburg 198005. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol.
40, No. 4, pp. 143–149, July–August, 1999. 相似文献
4.
V. S. Nagornyi 《Journal of Applied Mechanics and Technical Physics》2000,41(2):225-230
The physical and mathematical principles of the method of electrogas-and electrohydrodynamic conversion of electrical signals
to pneumatic (hydraulic) signals and vice versa for control of gas and liquid jets and flows in electropneumohydraulic systems
are considered.
St. Petersburg State Technical University, St. Petersburg 195251. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika,
Vol. 41, No. 2, pp. 25–31, March–April, 2000. 相似文献
5.
I. R. Smirnovskii 《Journal of Applied Mechanics and Technical Physics》1998,39(3):335-341
The shock-wave structure in an isotropic plasma is studied in the scale of the Debye shielding radius. The boundary condition
at “infinity” is due to the dissipation mechanism of ions reflected from the ion wavefront. The case of the absence of dissipation
corresponds to a collisionless shock wave. It is known that there is a critical Mach number above which the laminar shock
wave is impossible. In addition, two types of boundary conditions which occur if collisions in an equilibrium high- and low-ionized
plasma are taken into account are considered. The reflected ions are assumed to be scattered by electrons in the first case,
and the momentum of the reflected ions is assumed to be transferred to uncharged particles in the second case. The critical
Mach number of a shock wave does not exist under the conditions of collision dissipation of a flux of reflected ions.
St. Petersburg State University, St. Petersburg 198904. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol.
39, No. 3, pp. 14–21, May–June, 1998. 相似文献
6.
The possibility of creating shock-wave systems to achieve maximum supersonic flow turning angles is considered. The relation
between these systems and both geometrically conditioned optimal systems and the shock-wave structures formed as a result
of interaction between gasdynamic discontinuties is investigated.
St. Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 3, pp. 148–156, May–June,
1998. 相似文献
7.
An ablation model for a hydrogen pellet accelerating in a thermonuclear facility fuel-injector bore is developed. The model
is based on the Lagrange internal-ballistic problem complemented by the Stefan conditions on the ablating surface of the pellet
Calculations demonstrate that, during pellet motion in the bore under the action of the gas, the pellet length remains almost
unchanged, while due to the heat exchange with the bore walls the pellet diameter decreases by 4–10%
St. Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 3–11, January–February,
1999. 相似文献
8.
A. V. Omel'chenko V. N. Uskov 《Journal of Applied Mechanics and Technical Physics》1998,39(3):375-383
Discontinuity decay at a singular point of a centered compression wave is considered. Analytical solutions are given that
allow one to determine the type of reflected discontinuity that issues from the point of decay and the boundaries of ranges
of parameters within which a solution of the problem exists.
Baltiisk State Technical University, St. Petersburg 198005. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika,
Vol. 39, No. 3, pp. 59–68, May–June, 1998. 相似文献
9.
The transient regime in gas flow past a stepwise accelerated body is analyzed by the method of singular perturbations at small
Froude numbers. A marked effect of the initial conditions on the shock layer gas flow is demonstrated. The problem of flow
past a wedge is solved in quadratures.
St.Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 111–121, January–February,
1997. 相似文献
10.
V. V. Borovikov A. V. Bystrov 《Journal of Applied Mechanics and Technical Physics》1999,40(3):531-534
A new gas-dynamic method for decreasing the resistance of ground to the penetration of a solid body is developed. The physical
essence of the process is considered. Theoretical fundamentals of scaled modeling are given. Results of experimental studies
are presented, and the range of parameter for which the method is effective is determined.
Mozhaiskii Military Space-Engineering Academy, St. Petersburg 197082. Translated from Prikladnaya Mekhanika i Tekhnicheskaya
Fizika, Vol. 40, No. 3, pp. 196–199, May–June, 1999. 相似文献
11.
D. V. Sadin 《Journal of Applied Mechanics and Technical Physics》1999,40(6):1106-1110
One-dimensional plane pulsed joint motion of a gas phase and a disperse phase in the presence of friction of the latter against
the duct walls are studied numerically using the model of a heterogeneous medium. It is established that two qualitatively
different regimes of motion are possible, depending on the initial conditions in a high-pressure chamber and the value of
the friction factor. It is found that the powder exit velocity is self-similar with respect to friction.
Mozhaiskii Military Space Engineering Academy, St. Petersburg 197082. Translated from Prikladnaya Mekhanika i Tekhnicheskaya
Fizika, Vol. 40, No. 6, pp. 122–127, November–December, 1999. 相似文献
12.
D. V. Sadin 《Fluid Dynamics》1994,29(1):156-158
The unsteady filtering flow of a gas described by the equations of motion proposed by Khristianovich in [1] is investigated.
It is shown that for the gas flow in the pores a critical regime can develop when the reduced velocity (an analog of the Mach
number in gas dynamics) is less than unity. The reduced velocity is the ratio of the flow velocity to the velocity of propagation
of small filtering perturbations at a given point of the flow.
St Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 1, pp. 201–203, January–February,
1994. 相似文献
13.
D. V. Sadin 《Journal of Applied Mechanics and Technical Physics》1999,40(1):130-135
The unsteady axisymmetric jet produced by discharge of a mixture of a pressurized gas and dispersed particles from a circular
duct into the atmosphere is studied within the framework of two-velocity, two-temperature gas dynamics. An attempt is undertaken
to allow for the effective pressure due to random particle motion. The collision mechanism is found to be essential to radial
expansion of the flow. Experimental data that support the results obtained are reported.
Mozhaiskii Military Spacecraft Engineering Academy, St. Petersburg 197082. Translated from Prikladnaya Mekhanika i Tekhnicheskaya
Fizika, Vol. 40, No. 1, pp. 151–157, January–February, 1999. 相似文献
14.
Electrogas- and electrohydrodynamic control of gas and liquid jets and flows. 2. Physical principles
V. S. Nagornyi 《Journal of Applied Mechanics and Technical Physics》2000,41(3):408-415
The paper deals with the electrophysical principles of the method of electrogas- and electrohydrodynamic conversion of electric
signals to pneumatic (hydraulic) signals and vice versa for the control of gas and liquid jets and flows in electropneumohydraulic
systems, including problems of formulating requirements for the working media and electric circuits of converters, estimating
the limiting ranges of pressure, velocity, and temperatures of the working media and limiting dynamic possibilities, and determining
conditions for production of potential signals, stable control, and extension of the control ranges.
St. Petersburg State Technical University, St. Petersburg 195251. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika,
Vol. 41, No. 3, pp. 34–42, May–June, 2000. 相似文献
15.
D. V. Sadin 《Journal of Applied Mechanics and Technical Physics》2000,41(1):76-83
The regularities of the initial stage of discharge of a two-phase disperse medium from a bounded duct capable of longitudinal
motion are established. Numerical results obtained within the framework of a medium with nonequilibrium for velocities and
temperatures are compared with analytical solutions of the equilibrium mechanics of disperse systems for the case where the
characteristic time of the process is of the order of the characteristic times of velocity and thermal relaxation or smaller.
Mozhaiskii Military Space Engineering Academy, St. Petersburg 197082. Translated from Prikladnaya Mekhanika i Tekhnicheskaya
Fizika, Vol. 41, No. 1, pp. 84–91, January–February, 2000. 相似文献
16.
Dilute polymer solutions that reduce turbulent friction are treated as viscoelastic liquids for which, in addition to the
Reynolds number, the scale-up criteria include the Deborah or elasticity number. Introduction of a generalized (viscoelastic)
Reynolds number makes it possible to reduce the experimental curves for the drag coefficients obtained in pipes of various
diameters at different and concentrations to a unified dependence.
St. Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 191–196, July–August,
1998. 相似文献
17.
The results of measuring the resistance when the flow changes from steady to pulsating are discussed on the basis of simple
mathematical models of the individual vessel and the microvascular module.
Moscow, St Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No.2, pp. 83–89, March–April,
1994. 相似文献
18.
Mathematical models for numerical studies of transportation of a mass of loose granular material during occurrence of a series
of deep gas-dynamic ejections are developed using methods of the mechanics of continuous and granular media. Features of the
kinematics and dynamics of development of this phenomenon are analyzed. Results of a numerical experiment and recommendations
on use of the models in studies of specific transportation regimes are given.
Mozhaisk Military Space-Engineering Academy, St. Petersburg 197082. Translated from Prikladnaya Mekhanika i Tekhnicheskaya
Fizika, Vol. 39, No. 1, pp. 3–14, January–February, 1998. 相似文献
19.
The effect of flow intensification in small-sized vortex cells on the flow pattern in the near wake downstream of a cylinder
and the cylinder drag in laminar and turbulent flows is analyzed on the basis of a numerical simulation of the two-dimensional
steady-state flow past a circular cylinder with rotating cylindrical bodies built into the cylinder contour.
St. Petersburg, Saratov. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 88–96,
July–August, 2000.
The study was carried out with the support of the Russian Foundation for Basic Research (projects Nos. 99-01-01115 and 99-01-00772). 相似文献
20.
The problem of limiting progressive Stokes waves characterized by a crest angle of 120° propagating in an inviscid incompressible
fluid of finite depth is solved numerically. The wave forms are obtained and the range of Froude numbers, calculated from
the fluid depth and the phase velocity, on which solutions exist is determined.
St. Petersburg. Translated from Izvestiya Rossiiskoi Akademii Nauk, Mekhanika Zhidkosti i Gaza, No. 4, pp. 125–129, July–August,
1994. 相似文献