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Thermophysics and Aeromechanics

2007 year, number 4

F.A. Zander and Yu.V. Kondratyuk, pioneers of rocket engineering (to the 120th anniversary of F.A. Zander and 110th anniversary of Yu.V. Kondratyuk)

A.I. Maksimov
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 469–492

Abstract >>
The paper briefly describes the life and activities of F.A. Zander and Yu.V. Kondratyuk (A.I. Shargei), pioneers of domestic rocket engineering who made a significant contribution to the development of cosmonautics and rocket technologies. The main ideas and proposals of these prominent scientists and inventors in the field of rocket and space engineering, which found their application in space conquering, are considered.

Inversion temperature for adiabatic evaporation of liquid into an air-steam mixture

E.P. Volchkov1, A.I. Leontiev2, and S.N. Makarova1
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Bauman Moscow State Technical University, Moscow, Russia
Pages: 493–504

Abstract >>
This paper deals with adiabatic evaporation of various liquids into an air-steam mixture and pure superheated steam. The focus is made on the inversion temperature, which means that the rate of liquid evaporation into an air-steam mixture (superheated steam) becomes equal to the rate of evaporation into dry air. A simple analytical solution for finding of inversion temperature was derived, and the required conditions of existence of the given phenomenon are found. The influence of parameters of the main flow (vapor quantity, pressure, and flow regime) on the value of inversion temperature is analysed. It is shown that consideration of the influence of injection flow on relative function of heat transfer for inversion temperature definition of ethanol, acetone, and benzene is necessary. A comparison with numerical modelling was made to estimate the analytical solution accuracy.

Features of dry spot evolution at the film flow of cryogenic liquids at non-stationary heat release

A.N. Pavlenko, I.P. Starodubtseva, and A.S. Surtaev
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 505–513

Abstract >>
Transitional processes with dry spot formation and drying crisis development were studied experimentally for the gradual and quasi-stationary laws of heat release on a thin-wall heater cooled by a falling film of cryogenic liquid. It is shown that for low densities of the heat flux, the laminar-wave liquid film decays with formation of a self-organizing system of metastable regular structures with boiling liquid jets and large dry zones between them. The numerical experiment modelling the process of repeated wetting of a superheated surface dried by impulse heat release was carried out. It was found for the first time that the local motion velocities of different zones of the 2D wetting front differ significantly. Reliability of results obtained by numerical methods was proved by direct comparison with experimental data.

Longitudinal structures in the near field of a plane wall jet

V.G. Chernorai, M.V. Litvinenko, Yu.A. Litvinenko, V.V. Kozlov, and E.E. Cherednichenko
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 515–523

Abstract >>
In the present study, the flow field near the orifice of a plane wall jet is in focus. Two main flow regions may be distinguished in the wall jet, i. e., a free shear layer away from the wall and a boundary layer close to the surface. In both of these layers, streamwise coherent structures are detected by means of smoke visualization and hot-wire measurements. The structures, which occur naturally, have different spanwise scales and emerge at different distance from the nozzle. Effects of the flow velocity, upstream perturbations, and acoustic excitation on the generation and characteristics of the streamwise disturbances are investigated, and especially the interaction between the two layers is studied. In order to resolve the complex 3D flow by means of hot-wires a system for accurate automated traversing and data acquisition has been developed. In each flow case time-dependent measurements were taken in (X, Y, Z) space of about 3000 to 25,000 points, and it was found that the value of outlet velocity and the frequency of Kelvin

Investigation of the temperature field in a turbulent air flow in the channels with structured packing

B.V. Perepelitsa
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 525–531

Abstract >>
Temperature distribution and intensity of temperature pulsations in the airflow in a complex heat exchanger of

Handling of temperature dependence of viscosity in problems of incompressible medium flow around a cylinder

M.N. Zakharenkov
Zhukovsky TsAGI, Zhukovsky, Moscow Region, Russia
Bryansk Petrovsky State University, Bryansk, Russia
Pages: 533–559

Abstract >>
The viscous incompressible medium (water, air) flow past a circular cylinder is considered with regard for the temperature Т dependent viscosity n . The influence of different boundary conditions for temperature on flow structure, the drag coefficient and its components due to the pressure and viscosity is investigated in the problem of the flow past a cylinder at rest for the (diameter-based) Reynolds number ReD = 40. A relation between the viscosity gradient along a normal to the body surface and the integral vorticity flux from the body surface into the boundary layer is discussed. Unlike the constant viscosity case the vorticity flux may be different from zero, which must lead because of the integral conservation law for the vorticity to an alteration of the far-field boundary conditions for the velocity. In the same connection, the problem is analysed on the heat spot entry into the computational region under consideration for the flow past a circular cylinder. The examples of the symmetrization of separated flow past a cylinder performing rotation oscillations in a uniform free stream (the Taneda problem) are considered. A comparison with flow computations for low Mach numbers М < < 1 for the flow of a medium past a cylinder at rest is carried out. At the computation of the equation for heat transfer under the assumption of incompressibility of such media as air, it is proposed to retain the pressure derivative, which is typical of gases. In this case, a better agreement with the computations of compressible flows (for М < < 1) is achieved, for example, at the determination of the sizes of a symmetric zone of flow separation past a circular cylinder. An unsteady flow in the neighborhood of the point of joining the zero streamline bounding a closed region of separated flow (the cavity) in a wake of the cylinder at rest is obtained by a numerical simulation at the Reynolds number equal to 40.

Pressure recovery system for a high-power HF/DF laser: implementation practice

A.S. Boreysho1, S.L. Druzhinin1, V.M. Malkov1, I.A. Kiselev1, A.V. Morozov1, A.E. Orlov1, A.V. Savin1, I.V. Shatalov1, V.I. Zapryagaev2, and A.V. Sobolev2
1 Laser Systems Scientific Production Association, St. Petersburg, Russia
2Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 561–576

Abstract >>
The matter of development of a high-performance pressure recovery system (PRS) for a high-power HF/DF laser is discussed. A sequence of design steps is proposed, which involves estimation of basic characteristics of PRS components with the help of one-dimensional integral and semi-empirical procedures; simulation, to be performed using three-dimensional non-stationary Navier

Spatiotemporal evolution of the distribution function of electrons in sign-changing electric field

A.V. Fedoseev1 and G.I. Sukhinin1,2
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Pages: 577–589

Abstract >>
A numerical model for solving the Boltzmann unsteady non-local kinetic equation for the distribution function of electrons over energy is constructed. The Boltzmann equation for isotropic part of the distribution function written in natural variables the kinetic energy

Non-stationary conjugate heat exchange and phase transitions at the high-energy surface processing. Part 2. Simulation of the technological processes

A.A. Golovin And O.P. Solonenko
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Pages: 591–605

Abstract >>
The developed general physical-mathematical model, FEM-based calculation procedure as well as the software were in practical use to simulate the processes of the non-stationary conjugate heat exchange and phase transformations during the processing of the surface with a high-concentrated energy fluxes, with a stationary, pulsed, and movable heating sources (the processing, including the surface fusing with a quasi-laminar plasma jet, transfer electric arc and impulse electron beam; cleaning of the metal substrate surfaces from an oxide layer with the aid of a cathode vacuum arc, etc). The processes of practical importance with considerably different spatial and temporal scales featuring the density of the heat fluxes power q 

Investigation of plasma gasification of carbonaceous technogeneous wastes

A.S. An'Shakov1,2, V.A. Faleev1, A.A. Danilenko2, E.K. Urbakh1, and A.E. Urbakh1
1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
2Novosibirsk State Technical University, Novosibirsk, Russia
Pages: 607–616

Abstract >>
The possibility of efficient application of plasma equipment for gasification of various technogeneous carbonaceous wastes (domestic wastes, waste wood, rice hull, biologic wastes) is studied. Gasification of carbonaceous wastes is analysed thermodynamically. Possible prediction of gasification results is proved experimentally using the plasma equipment. It is shown that syngas appropriate for needs of power engineering and chemical industry is produced at plasma gasification of carbonaceous materials.

Axisymmetric problem of thermal energy accumulation based on liquid

I.I. Rozhin
Institute of Oil and Gas Problems SB RAS, Yakutsk, Russia
Pages: 617–624

Abstract >>
The axisymmetric problem of thermal energy accumulation in a material undergoing a phase transition at its interaction with a heat-transfer agent whose temperature varies cyclically is considered. The possibility of choosing the parameters of an accumulator part design, where the material is stored, is investigated by numerical methods. An optimal volume of the heat-accumulating material is determined from the condition of the equality of the heat amount at the accumulator charge- discharge. Results computed for the laminar and turbulent regimes of heat-transfer agent supply showed that the turbulent regime is the most efficient for the same heat-exchange surface.

Fluctuation measurements in a supersonic boundary layer implying in-situ calibration of the hot-wire anemometer

B. Lenz, U. Gaisbauer, and E. Krдmer
Institut f
Pages: 625–630

Abstract >>
A calibration technique for the constant-temperature hot-wire anemometer is presented, which is based on traversing the probe through the boundary layer of a flat plate while simultaneously performing fluctuation measurements. The free stream Mach number was M = 2.54, and the Reynolds number Red, based on wire diameter, ranged from 9 to 23. A comparison of the sensitivity values obtained with the aid of such a calibration procedure

Formation of coherent structures at interaction between an impact jet and a flow reflected from an obstacle

V.G. Prikhodko, I.V. Yarygin, And V.N. Yarygin
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Pages: 631–632

Abstract >>
The results of experimental research on interaction between an axisymmetric underexpanded jet and obstacles of various shapes (the plane one and in the form of a cylindrical cavity) are presented. It is found that a cavity provides formation of a reverse flow, whose interaction with a jet causes formation of the vortex spiral structures.