Home – Home – Jornals – Thermophysics and Aeromechanics 2006 number 4

The basic milestones of the life journey of S.P. Korolev (12.01.1907- 14.01.1966), the Designer General of rocket and space systems, are presented. Information on various missiles of the first generation R-1,
R-2, R-5, R-7, and R-9, launch vehicles Sputnik, Luna, Molniya, Vostok, Soyuz, and N-1, and also spacecraft designed for various purposes, which were developed under Korolev

Results on a hyperboloid-flare model tested in a new hypersonic wind tunnel with adiabatic compression AT-303 based at ITAM SB RAS at

The drag of an axisymmetric body of revolution in a nominally gradientless incompressible flow under the action of eddy breakup devices (EBU) is studied experimentally. It is demonstrated that the use of EBUs in the boundary layer may reduce the net drag of the body of revolution approximately by 1.75 %, as compared with the corresponding value for the original configuration. An increase in the chord length of single-element devices and the height of their location in the boundary layer is found to gradually reduce the EBU effectiveness and, hence, to increase the net drag, as compared with the original configuration.

Laminar-turbulent transition in a boundary layer of low-aspect-ratio wing was investigated. Experiments clarifying the flow structure, its mean and oscillatory characteristics were carried out accompanied by linear stability analysis of the wind tunnel data on the laminar flow velocity profiles. Theoretical results obtained in a parallel flow approximation are in a good agreement with the experimental data on disturbances evolution at the initial stage of transition to turbulence.

The two-dimensional boundary-value problem of the unsteady flow of an incompressible viscous gas moving behind the piston in a

A mathematical model is proposed to describe laser ablation of metals in vacuum under the action of nanosecond laser pulses of moderate intensity taking into account the processes of cluster formation and decay in the vapor cloud. To describe the laser radiation absorption and metal heating, the thermal model based on the unsteady one-dimensional heat equation with a volume heat source is used, and the method of statistical modelling is employed for modelling vapor expansion and the processes of cluster formation. The efficiency of the proposed complex model is considered by the example of pulsed laser ablation of a niobium target.

This publication is a continuation of works devoted to problems that arise in heterogeneous technologies. The matter of parameters that define the transition from surface erosion to particle spraying onto the surface is addressed. In particular, we experimentally examine the influence of temperature of the supersonic heterogeneous flow (carrier-gas temperature and particle temperature) interacting with the streamlined obstacle on the occurrence probability of either surface damage or particle spraying.

Results of experimental studies on temperature distribution over the surface of a complex-shape heat exchanger like

The temperature mode of a wall was studied experimentally for sub- and supercritical pressures of water in tubes with turbulence stimulators; these data were compared with similar results obtained for a smooth tube. An increase in heat transfer inside a turbulizing tube was revealed for a single- and two-phase water flows. Correlation dependencies for determination of heat transfer coefficient in a single-phase flow inside a tube with turbulence stimulators were obtained.

A mathematical model is presented for unsteady conjugate convective-conductive heat transfer in a closed volume with local sources of heat release under the conditions of a convective-radiation heat exchange on one of external faces of the solution region. The thermogravitation convection regime was analysed for moderate Grashof numbers. The typical temperature and velocity fields were obtained, and the fields of desired quantities were compared for the planar and three-dimensional models in one of the typical sections of the solution region.

The density of aqueous solutions of lithium bromide was studied by the monochromatic gamma-ray attenuation method at the saturation line from the liquidus temperature of up to 250 

New generalized formulas for calculation of thermal conductivity of aqueous solutions of binary and multicomponent inorganic substances under high values of state parameters were derived. New values of thermal conductivity were calculated for aqueous solutions of salts within the ranges of temperatures of 293- 473 K, concentrations of 0- 25 mass % and pressures

The experimental setup is described and results are presented for measuring average boiling-up lag time for superheated n-hexane mixed with solid structures (activated coal, cellulose, silica gel) as function of temperature under atmospheric pressure. The

The results of computing a stationary arc with annular attachment on the butt end of a solid cylindrical cathode are presented. The influence of the discharge external parameters on the characteristics of arc plasma and the anode thermal state are considered.

The possibility of effective application of a plasma technology to decompose the molybdenum sulphate concentrate, molybdenite, is under consideration. First, the model system MoS_2- N₂ and then the real concentrate underwent the thermodynamic analysis. It has been shown that in the case of the real system which contains quite a few carbon (~26 %), initial feedstock decomposes through a stage of refractory molybdenum carbide

Results of an experimental study of the ignition dynamics of propane-air premixed flows under pulsed-periodic laser irradiation are reported. Ignition of homogeneous flows emanating into free atmosphere is considered. A comparative analysis of experimental and predicted delay times for the ignition for a medium at rest is given.