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Thermophysics and Aeromechanics

2022 year, number 1

Theoretical modeling of fluid dynamics and heat transfer in wavy liquid films under complex flow conditions (review)

S.P. Aktershev, S.V. Alekseenko, O.Y. Tsvelodub
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: liquid film, wavy flow, heat transfer, effect of gas flow, thermocapillary effect, phase transition

Abstract >>
The review considers problems of fluid dynamics and heat transfer in wavy liquid films under complex flow conditions. The term "complex conditions" here means the presence of fluxes of mass, momentum and energy through the film surface. The purpose of the review is to analyze the latest achievements in investigations of wave modes of film flows.

Modeling of unsteady subsonic flow around an axisymmetric body with a turbulator

I.A. Shirokov, T.G. Elizarova
Keldysh Institute of Applied Mathematics RAS, Moscow, Russia
Keywords: quasi-gas-dynamic (QGD) equations, subsonic flow, laminar-turbulent transition

Abstract >>
Numerical simulation for external subsonic unsteady flow around an axisymmetric model is presented in this paper. The simulation uses a quasi-gas-dynamic algorithm implemented on an unstructured tetrahedral grid. A turbulator in the annular flap shape is allocated on the model surface: it sets the position of a laminar-turbulent transition. The problem statement corresponds to experiments for this model placed in a wind tunnel. The overall flow pattern, the distribution of the pressure coefficient on the surface, and the turbulent pulsation parameters demonstrate high qualitative and quantitative agreement with the experimental data.

Hysteresis of the aerodynamic characteristics of NACA 0018 airfoil at low subsonic speeds

D.A. Alieva, K.A. Kolinko, A.N. Khrabrov
Central Aerohydrodynamic Institute, Zhukovsky, Russia
Keywords: aerodynamic experiment, NACA 0018 airfoil, flow separation, hysteresis of aerodynamic characteristics, phenomenological mathematical model

Abstract >>
Results of an experimental study of the hysteresis of aerodynamic characteristics of NACA 0018 airfoil in the T-124 low-turbulent wind tunnel of low subsonic speeds of TsAGI are reported. The experiments were carried out on the OVP-124 dynamic setup under steady-state conditions with a quasi-static (continuous) increase and decrease of the angle of attack and with forced oscillations of the model over pitch with different amplitudes and frequencies relative to various set angles of attack. In all cases, measured aerodynamic characteristics exhibits a hysteresis related with the presence of a range of attack angles in which stable, non-unique separated-flow structures are observed. On the basis of experimental data obtained, a new approach to the mathematical modeling of the phenomenon of static and dynamic hysteresis of aerodynamic characteristics is developed for use in dynamics problems.

Mathematical modeling of a thermionic thermal protection system for high-enthalpy flow around a spherically blunted cone

K.N. Efimov, E.L. Loboda, V.A. Ovchinnikov, A.S. Yakimov
Tomsk State University, Tomsk, Russia
Keywords: conjugate heat transfer, thermionic thermal protection system, emitter, collector, cooler

Abstract >>
A mathematical model of the process of the unsteady conjugate heat transfer of a thermionic thermal protection system in a supersonic flow around a composite shell is formulated and investigated. Estimates of the effect of evaporation (emission) of electrons from the emitter surface on the reduction of temperature of the composite shell of the protection system were obtained. The effect of different angles of attack on the modes of heat transfer in a multi-element thermionic thermal protection system was examined. Qualitative agreement of calculation results with known data is obtained.

Numerical study of thermal effects in an acoustic-convective flow in a bichannel system

A.A. Zhilin1,2, A.V. Primakov1,2
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Siberian State University of Water Transport, Novosibirsk, Russia
Keywords: Hartmann generator, wave processes, resonator, off-design jet, pressure distribution, temperature field in the channel

Abstract >>
The results of numerical simulation of gas-dynamic flow in the channel of a technical device with a resonant cavity are presented. One period of gas-dynamic loading of structural elements of the resonant cavity has been studied in detail. A complete picture of pressure and temperature field distribution along the resonant cavity channel has been obtained. The maximum and minimum values of pressure and temperature, achieved when the gas flow moves along the resonator channel, have been determined.

Experimental-theoretical study of pressure distribution along the wall when a supersonic gas flow moves in an axisymmetric channel with sudden expansion

N.P. Skibina, S.A. Tyrtyshny, V.V. Faraponov
Tomsk State University, Tomsk, Russia
Keywords: aerodynamic tests, pressure recording, axisymmetric channel, shock waves

Abstract >>
The paper describes a study of pressure distribution along the wall of an axisymmetric channel with a straight step. A supersonic gas flow, formed inside the channel, when an external flow with Mach numbers M = 5 and M = 6 moves around an axisymmetric model with internal duct , is considered. A supersonic aerodynamic wind tunnel of a short-term action is used for experiments. The results of measuring the pressure along the channel wall in the flow around the model under study are presented. The data of aerodynamic tests are compared with the results of numerical calculations, and the resulting pressure distributions are compared. It has been established that the nonmonotonic nature of a change in pressure along the wall is caused by the shock waves, which accompany the supersonic gas flow in the channel.

The formation of a transonic zone at the combustion of hydrocarbon fuel in a supersonic flow with М < 2

V.P. Zamuraev, A.P. Kalinina
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: combustion of hydrocarbon fuel, supersonic flow, transverse jets, transonic regime

Abstract >>
The combustion of hydrocarbon fuel at the Mach number M = 1.7 is studied numerically. A transverse air stream is used to ignite the fuel supplied through the axial injector. The Reynolds-averaged Navier-Stokes equations closed by the k-ε turbulence model are solved. Fuel combustion is simulated using a single reaction approach. The possibility of transonic flow formation has been investigated. The gas-dynamic structure of kerosene fuel combustion is studied for a flow with the Mach number M = 1.7 and stagnation temperature of 1500 K.

Influence of the method of fuel mixture supply on the main characteristics of heat and mass transfer processes

A.S. Askarova1,2, V.E. Messerle1,2,3, Saltanat.A. Bolegenova1,2, V.Yu. Maksimov1, Symbat.A. Bolegenova4, A.O. Nugymanova1
1Al-Farabi Kazakh National University, Almaty,Kazakhstan
2Scientific Research Institute of Experimental and Theoretical Physics, Almaty,Kazakhstan
3Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
4Scientific Research Institute of Experimental and Theoretical Physics, Almaty, Kazakhstan
Keywords: heat and mass transfer, numerical simulation, air mixture supply method, reduced boiler load, velocity, temperature, concentration of harmful substances

Abstract >>
Computational experiments were carried out using three-dimensional computer modeling methods to determine the effect of various burner arrangements and the method of fuel mixture supply on the main characteristics of heat and mass transfer processes (flow aerodynamics, temperature fields, concentration fields of combustion products) throughout the entire volume of the combustion chamber of a power boiler and at its outlet. It is shown that the use of vortex burners with a swirl of the air mixture flow allows improvement of metabolic processes in the combustion chamber and reduces emissions of harmful substances into the atmosphere both during traditional fuel combustion and at reduced boiler load (partial shutdown of burners).

Simulation of continuous spin detonation in an annular combustion chamber in two-dimensional statement

I.N. Borovik1, I.R. Farizanov1, L.S. Yanovskii1,2
1Moscow Aviation Institute, Moscow,Russia
2Institute of Problems of Chemical Physics RAS, Moscow,Russia
Keywords: continuous (spin) detonation, numerical simulation, detonation engine

Abstract >>
The article presents results of a numerical simulation of the phenomenon of continuous spin detonation in a hydrogen-oxygen mixture in two-dimensional non-stationary formulation using periodic boundary conditions. The soft-ware implementation of the mathematical model is made in the Ansys Fluent software package. A methodology for adjusting the software package and an algorithm for initiating the detonation process for numerical simulation are presented. The method was verified by calculating and comparing with experimental data the propagation velocity of a plane detonation wave with various diluents. Using the developed modeling technique, the specific impulses and the velocities of continuous spin detonation were determined for fuel excess ratios in the range from 0.56 to 2.4. The simulation results showed good agreement with the results obtained by other authors. Also, the performed numerical simulation has shown that, on the average, the specific impulse of the combustion chamber of a detonation rocket engine is greater than the specific impulse of a liquid-propellant rocket engine by 17%. It is shown that the use of the continuous spin detonation process can significantly reduce the length of the cylindrical part of the combustion chamber and the gas generator of the liquid rocket engine.

Heat transfer coefficients of Mg70Li30 ultralight alloy

D.A. Samoshkin, R.N. Abdullaev, A.Sh. Agazhanov, S.V. Stankus
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: magnesium-lithium alloy, congruently melting composition, thermal conductivity, thermal diffusivity

Abstract >>
The transfer properties of a congruently melting Mg-Li alloy with a lithium content of 30 at. %, considered as a promising ultralight structural material for the aerospace industry, have been studied experimentally. New experimental data on thermal diffusivity ( a ) and thermal conductivity ( l ) have been obtained in the temperature range of 293-777 K with estimated errors of 2 - 4 % and 3 - 5 %, respectively. The results have been compared with the known literature data on thermal conductivity of alloys from the Mg-Li system. A table of recommended temperature dependences for a and l of the studied composition has been developed.

70th Anniversary of Sergey V. Stankus

Abstract >>
On January 30, 2022, Sergey V. Stankus, the prominent scientist working in the area of thermophysics, Doctor of Physics and Mathematics and Chief Researcher of the Institute of Thermophysics SB RAS, became 70 years of age.