共查询到20条相似文献,搜索用时 31 毫秒
1.
A. D. Chornyi N. V. Kornev E. Hassel 《Journal of Engineering Physics and Thermophysics》2008,81(4):692-707
Results of numerical simulation of the mixing of a turbulent jet with a cocurrent incompressible-fluid flow (Schmidt number
Sc ≈ 1000) in a cylindrical channel of circular cross section (axisymmetric mixer) with the use of the standard k-ε turbulence
model and different models for the averaged value of the mixture fraction and its variance have been given. For the problem
of mixing of an inert passive impurity, two regimes of flow — the regime with the formation of a recirculation zone and that
without its formation — have been considered. The formulated statistical model has been verified with the use of experimental
data and results of calculation by large-eddy simulation.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 4, pp. 666–681, July–August, 2008. 相似文献
2.
V. L. Zhdanov A. D. Chornyi É. Hassel 《Journal of Engineering Physics and Thermophysics》2007,80(2):259-272
The experimental results for two regimes of mixing of a passive impurity in an axisymmetric jet mixer — the mixing of a turbulent
jet and a cocurrent flow to form a recirculation zone behind the nozzle and an analogous mixing without the formation of a
recirculation zone (Red = 10,000) — have been presented. The velocity field has been measured in the mixer cross sections at different distances
from the nozzle (0.1 < x/D < 9.1) with a one-component Doppler laser anemometer, whereas the scalar field (concentration of
the passive impurity) has been diagnosed by the laser-induced fluorescence method. Based on the scalar distributions obtained,
the autocorrelation function and the integral scale have been computed, the form of the probability density function has been
restored, and the distributions of the asymmetry and excess coefficients have been constructed. Visualization of flow in the
mixer has been carried out.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 2, pp. 46–59, March–April, 2007. 相似文献
3.
The velocity of a plasma jet in the nozzle exit section and the pressure in the discharge zone of a coaxial-electrode Hall
accelerator have been calculated on the basis of the experimentally measured enthalpy, temperature, and electron concentration
near the indicated section within the framework of a model of the magnetic hydrodynamics of a plasma flow.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 3, pp. 102–108, May–June, 2006. 相似文献
4.
K. N. Volkov S. V. Denisikhin V. N. Emel’yanov 《Journal of Engineering Physics and Thermophysics》2006,79(4):678-684
Flows in the channels of solid-fuel charges with cross sections having different views in plan and flows in the prenozzle
volume and the nozzle unit of a solid-fuel rocket engine have been simulated on the basis of the STAR-CD suite for different
types of charges and different designs of the input part of the engine nozzle. The influence of the compressibility, turbulence,
geometric factors, and flow rate on the distributions of gasdynamic parameters in the working region of the engine has been
investigated.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 4, pp. 50–56, July–August, 2006. 相似文献
5.
Modeling of Nonstationary Flow in the Ramjet Channel with a Distributed Pulse-Periodic Energy Supply
A study has been made of the influence of a pulse-periodic supply of energy that is equal to the energy released in combustion
of hydrogen in air on the structure of supersonic flow in a channel of variable cross section, which models the ramjet duct.
The flow has been modeled based on two-dimensional nonstationary gas-dynamics equations. Different regimes of flow depending
on the configuration of the zones of energy supply and the excess-air coefficient have been obtained.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 4, pp. 152–157, July–August, 2005. 相似文献
6.
A study has been made of the influence of the pulse-periodic supply of energy that is equal to the energy released in the
combustion of hydrogen in air on the structure of supersonic flow in a channel of variable cross section, modeling the duct
of a ramjet engine. The flow has been modeled on the basis of two-dimensional nonstationary gas-dynamic equations. Different
flow regimes have been obtained depending on the configuration of the zones of energy supply and the excess-air coefficients.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 3, pp. 464–469, May–June, 2008. 相似文献
7.
R. F. Kelbaliev R. Yu. Aliev M. B. Ismailov 《Journal of Engineering Physics and Thermophysics》2008,81(5):930-934
It has been established that in the region of pressures close to a critical one, heat transfer in a transient regime of motion
of a single-phase flow in a horizontal coil pipe changes nonuniformly over the cross section of the perimeter. The main factors
here are the influence of inertia forces and of free convection. Equations to calculate the heat-transfer coefficient are
suggested.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 5, pp. 892–896, September–October, 2008. 相似文献
8.
A. S. Chizhikov 《Journal of Engineering Physics and Thermophysics》2009,82(2):315-320
An air jet with an excess static pressure at a regime of escape into quiescent air is considered. The range of Mach number
variation is 1–3, and that of the inefficiency ratio 1–1000. An analysis has been made on the basis of the well-known experimental-calculated
approximation dependences for stationary expanding flows. We solve the inverse problem where the parameters at the nozzle
exit and the geometric characteristics of the initial section of the jet are known and it is required to find the remaining
quantities corresponding to them. In the present analysis, this is the rate of flow through a central discontinuity and the
integral characteristic of the magnitude of the total pressure loss.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 82, No. 2, pp. 320–325, March–April, 2009. 相似文献
9.
Two-phase (liquid-gas) flows in a short horizontal slit channel of rectangular cross section with heights (thicknesses) from
100 to 500 μm have been experimentally studied using the laser-induced fluorescence and schlieren photography methods. It
is established that the formation of various two-phase flow regimes and the transitions between different regimes are determined
by instabilities of the liquid-gas flow in the side parts of a channel. In a 100-μm-thick channel, a frontal instability has
been observed during the liquid-gas interaction in the region of liquid output from the nozzle. 相似文献
10.
Ya. A. Samoilovich V. I. Timoshpol’skii S. M. Kabishov 《Journal of Engineering Physics and Thermophysics》2007,80(4):644-649
An analysis of the interaction of the melt flow with the surface of dendritic crystallites has been performed using the concept
of a diffusion boundary layer, and the regularities of the impurity distribution over the cross section of ingots and castings
in the process of their solidification have been revealed.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 4, pp. 8–12, July–August, 2007. 相似文献
11.
I. A. Fedorov 《Journal of Engineering Physics and Thermophysics》2011,84(1):171-178
Measurements have been made of gasdynamic characteristics of the flow of the active medium as well as energy and spectral
characteristics of radiation generated by a continuous chemical HF laser with a radially expanding nozzle unit. Based on the
analysis of measurement results, the flow structure of the active medium has been determined, which is formed by the “nozzle–injector”
reactant mixing scheme. It has been shown that only a part of the active medium is involved in the radiation generation. Measures
for improving the efficiency of its use have been proposed. 相似文献
12.
Free convective heat transfer in a solution domain quite accurately modeling the cross section of the object of heat consumption
has been investigated numerically. Typical velocity and temperature fields have been presented.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 1, pp. 56–63, January–February, 2006. 相似文献
13.
E. V. Vlasov A. S. Ginevskii T. M. Makarenko 《Journal of Engineering Physics and Thermophysics》1998,71(1):76-80
Based on an analysis of experimental data on high-frequency acoustic excitation of turbulent jets, we investigate the effect
of the mode of flow in the boundary layer of the outlet section of the nozzle on realization of the turbulence attenuation
effect. It is claimed that high-frequency acoustic excitation of jets leads to a decrease in turbulent fluctuations on the
axis of the initial stretch of the jet and to reduction of noise in both initially laminar and initially turbulent boundary
layers at the nozzle outlet.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 71, No. 1, pp. 81–85, January–February, 1998. 相似文献
14.
S. A. Isaev S. V. Guvernyuk M. A. Zubin Yu. S. Prigorodov 《Journal of Engineering Physics and Thermophysics》2000,73(2):337-344
Based on a numerical solution, by the finite-volume method, of two-dimensional Reynolds equations that are closed using Menter’s
two-parameter turbulence model and on physical modeling in a wind tunnel the authors analyze flow in a channel with a cylindrical
vortex cell of circular cross section.
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 73, No. 2, pp. 346–353, March–April, 2000. 相似文献
15.
M. V. Vinogradova Yu. S. Teplitskii 《Journal of Engineering Physics and Thermophysics》2006,79(4):788-801
The heat transfer from a tube filled with an infiltrated granular layer has been simulated with account for the parallel thermal
conductivity of this layer at the first-kind and second-kind boundary conditions at the outer surface of the tube with the
use of the Danckwerts conditions. Analytical dependences determining the influence of the parallel thermal conductivity of
the granular layer on the average at its cross section as well as on the heat flow and the heat transfer in it have been obtained.
Dependences for calculating the active length of a heat exchanger are presented.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 79, No. 4, pp. 153–164, July–August, 2006. 相似文献
16.
A two-phase (liquid-gas) flow and the formation of liquid drops in a narrow horizontal slit channel of rectangular cross section
with a height (thickness) of 100–440 μm has been experimentally studied. It is established that flow regimes exist in which
drops can be formed at low values of reduced liquid and gas velocities. Various regimes are determined in which either immobile
drops appear on the channel walls or moving drops are formed as a manifestation of instabilities in the two-phase flow. 相似文献
17.
A two-phase (liquid-gas) flow in a short horizontal slit channel of a rectangular cross section with a height of 440 μm has
been experimentally studied using a fluorescent method, which allowed the flow pattern to be monitored and its quantitative
characteristics to be measured. It is established that two-phase flow regimes in this channel substantially differ from the
classical regimes of flow in extended channels of large cross section. It is demonstrated that the formation of various two-phase
flow regimes and the transitions between them in short narrow rectangular slits are determined by instability of the liquid-gas
flow at the side-walls of the channel. 相似文献
18.
S. A. Isaev A. I. Leont'ev G. I. Kiknadze N. A. Kudryavtsev I. A. Gachechiladze 《Journal of Engineering Physics and Thermophysics》2005,78(4):749-761
The vortex heat exchange in turbulent flows around a spherical hole and a transverse trench, identical in depth and in the
shape of the middle cross section, on a plane wall has been numerically investigated using multiblock computational technologies.
A factorized, implicit multiblock algorithm and a Menter's model of shear-stress transfer were tested in the process of comparative
analysis of calculation and experimental data on flows around isolated holes.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 4, pp. 117–128, July–August, 2005. 相似文献
19.
The problem of filtration of a gas-condensate mixture near the operating well with a hydraulic fracture has been investigated.
It was assumed that flow is three-dimensional in the matrix and two-dimensional on the fracture. It has been shown that for
steady-state flow, the problem is split into a purely physicochemical problem on phase transitions and a nonlinear partial
boundary-value problem for the pressure field. An example of numerical solution for the fracture with a prescribed conductivity
field has been given.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 81, No. 3, pp. 409–416, May–June, 2008. 相似文献
20.
Yu. S. Teplitskii V. I. Kovenskii M. V. Vinogradova 《Journal of Engineering Physics and Thermophysics》2007,80(5):998-1005
A generalization of the Brinkman equation to the case of linear filtration has been proposed based on an analysis of the existing
models of filtration of a liquid (gas) in a stationary granular bed. It has been shown that, with allowance for the local-porosity
distribution over the cross section of the apparatus, this equation makes it possible to describe velocity distributions observed
experimentally in the wall zone.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 5, pp. 141–147, September–October, 2007. 相似文献