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Thermophysics and Aeromechanics

2015 year, number 5

1.

Famous researcher in mechanical engineering of the XX century (to the 100th anniversary of  N.A. Zheltukhin)

A.I. Maksimov 


Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

E-mail: maksimov@itam.nsc.ru


Pages: 525533
Abstract >>

November 13, 2015 was the 100th anniversary of Nikolay Alekseevich Zheltukhin, corresponding member of the Academy of Sciences of the USSR, Lenin Prize winner, a famous specialist in the field of thermal engineering, hydrodynamic stability, gas dynamics, and high-velocity aerodynamics.


DOI: DOI: 10.1134/S0869864315050017
																								



2.

Aerodynamic characteristics of reentry vehicles at supersonic velocities 

N.P. Adamov1, A.M. Kharitonov1, E.A. Chasovnikov1, A.A. Dyadkin2, M.I. Kazakov2, A.N. Krylov2, and A.Yu. Skorovarov2 


1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

2Rocket Space Corporation Energia, Korolev, Moscow Region, Russia

E-mail: khar@itam.nsc.ru


Keywords: reentry vehicle, separable rescue module, balance tests, simulations, aerodynamic coefficients
Pages: 535543
Abstract >>

Models of promising reentry vehicles, experimental equipment, and test program are described. The method used to determine the total aerodynamic characteristics of these models on the AB-313 mechanical balance in the T-313 supersonic wind tunnel and the method used for simulations are presented. The aerodynamic coefficients of the examined objects in wide ranges of Mach numbers and angles of attack are obtained. The experimental data are compared with the results of simulations. 


DOI: DOI: 10.1134/S0869864315050029
																								



3.

Numerical modeling of the conditions for realization of flow regimes in supersonic axisymmetric conical inlets of internal compression 

Yu.P. Gounko1 and I.I. Mazhul1,2 


1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

2Novosibirsk State Technical University

E-mail: gounko@itam.nsc.ru, mazhul@itam.nsc.ru


Keywords: numerical modelling, supersonic axisymmetric flow, conical inlet of internal compression, critical conditions of the realization of flow regimes
Pages: 545558
Abstract >>

The results of the numerical investigation of flow regimes in the axisymmetric inlets of internal compression at a supersonic flow around them are presented in the work. The main attention is paid to the determination of the ranges of the duct geometric convergence, in which a supersonic inflow in the inlet realizes. The investigation has been carried out at high supersonic freestream velocities corresponding to the Mach numbers  = 2-8 by the example of the frontal conical (funnel-shaped) inlets with the angles of the internal cone wall inclination δw = 7.5-15 under the variation of the relative area of the throat cross section. The flow structure alteration was studied and the critical relative areas of the inlet throat were determined, at which either there is no starting of the inlet in the process of flow steadying at the initial subsonic flow in it or a flow breakdown occurs in the process of flow steadying at an initial supersonic inflow. Numerical computations of the axisymmetric flow were done on the basis of the solution of the NavierStokes equations and the k-ω SST turbulence model.


DOI: DOI: 10.1134/S0869864315050030
																								



4.

Direct numerical simulation of transition to turbulence in a supersonic boundary layer 

A.N. Kudryavtsev and  D.V. Khotyanovsky 


Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

E-mail: khotyanovsky@itam.nsc.ru


Keywords: direct numerical simulation, laminar-turbulent transition, supersonic boundary layer
Pages: 559568
Abstract >>

Based on full unsteady compressible NavierStokes equations a direct numerical simulation of the linear and nonlinear stages of the laminar-turbulent transition in boundary layer of a flate plate at the freestream Mach number M = 2 is carried out.


DOI: DOI: 10.1134/S0869864315050042
																								



5.

Testing a dual-mode ramjet engine with kerosene combustion 

V.M. Levin1, V.N. Karasev1, L.L. Kartovitskii1, E.A. Krymov2, and O.A. Skachkov2 


1Moscow Aviation Institute (National Research University), Moscow, Russia

2Bardin Central Research Institute of Ferrous Metallurgy, Moscow, Russia

E-mail: vadimlevin@yahoo.com


Keywords: dual-mode ramjet engine, kerosene, firing tests
Pages: 569574
Abstract >>

Results of life firing tests of a dual-mode ramjet engine intended for operation in the speed range = 3-6 are discussed. The tests were carried out on a test bench under freestream conditions typical of Mach 6 flight at 27.6-km altitude. In the tests, the adopted design and technological solutions were verified, and efficient operation of the ramjet engine with kerosene combustion during 110 s was demonstrated.


DOI: DOI: 10.1134/S0869864315050054
																								



6.

An experimental study of filtration characteristics of highly porous cellular materials 

S.G. Mironov1,2, V.A. Kolotilov1, and A.A. Maslov1,2 


1Novosibirsk State University, Novosibirsk, Russia

2Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia

E-mail: mironov@itam.nsc.ru


Keywords: highly porous cellular materials, hydrodynamics, effect due to porous geometry and gas density
Pages: 575583
Abstract >>

Measured data on the filtration velocity of air in highly porous cellular materials under conditions of high filtration velocities and reduced air densities are reported. The viscosity and inertia coefficients entering the quadratic dependence of pressure gradient as a function of filtration velocity in porous materials for various flow conditions in the pores are evaluated.


DOI: DOI: 10.1134/S0869864315050066
																								



7.

Modelling of the process of fragmentation and vaporization of non-reacting liquid droplets in high-enthalpy gas flows 

K.Yu. Arefyev1,2 and A.V. Voronetsky2 


1Central Institute of Aviation Motor Building named after P.I. Baranov, Moscow, Russia

2Bauman Moscow State Technical University, Moscow, Russia

E-mail: arefyev@ciam.ru, voron@bmstu.ru


Keywords: two-phase flow, high-enthalpy flow, mathematical modelling, fragmentation of droplets, vaporization of droplets
Pages: 585596
Abstract >>

The intensification of the fragmentation and vaporization of liquid droplets in two-phase flows with the gas stagnation temperature g = 800-2500 K is an important scientific and technological problem. One should note that despite a high practical importance the mechanism of the vaporization of droplets with their preliminary gas-dynamic fragmentation in high-enthalpy flows has been studied insufficiently completely and requires additional research. The paper presents a mathematical model and the results of the computations of the fragmentation and vaporization of liquid droplets in subsonic and supersonic flows with a high stagnation temperature. A comparison of the obtained data with the experiments of other authors has been done. The extension of the regions of the gas-dynamic fragmentation and droplet vaporization in flow ducts with a variable distribution of parameters has been estimated. The found peculiarities may be used at the design of energy installations of the promising samples of the aerospace technology and gas-dynamic pipes.


DOI: DOI: 10.1134/S0869864315050078
																								



8.

Numerical simulation of turbulent swirling gas-dispersed flow behind a sudden tube expansion 

M.A. Pakhomov and V.I. Terekhov 


Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

E-mails: pakhomov@ngs.ru, terekhov@itp.nsc.ru


Keywords: two-phase swirling flow, solid particles, separation areas, numerical simulation, turbulence, model of Reynolds stress transport
Pages: 597608
Abstract >>

The mathematical model is developed and the swirling two-phase flow behind a sudden tube expansion is simulated numerically using the model of Reynolds stress transport. The gas phase is described by the three-dimensional RANS-equations taking into account the back effect of particles on transport processes in gas. To calculate the dispersed phase dynamics in a swirling confined flow, the Euler approach are used. It is found that with an increase in size, the particle are not involved into the separated flow and keep a positive value of the averaged axial velocity along the computational domain. Due to inertia of particle, the zone of reverse flows for the dispersed phase is noticeably smaller than the recirculation zone of gas phase. Performance of the developed mathematical model for description of the swirling two-phase flows in the presence of detachment areas is shown.


DOI: DOI: 10.1134/S086986431505008X
																								



9.

Large eddy simulation of fine water sprays: comparative analysis of two models and  computer codes 

A.S. Tsoy and A.Yu. Snegirev 


St.-Petersburg Polytechnic University, St. Petersburg, Russia

E-mail: a.snegirev@phmf.spbstu.ru


Keywords: large eddy simulation, fine water sprays
Pages: 609620
Abstract >>

The model and the computer code FDS, albeit widely used in engineering practice to predict fire development, is not sufficiently validated for fire suppression by fine water sprays. In this work, the effect of numerical resolution of the large scale turbulent pulsations on the accuracy of predicted time-averaged spray parameters is evaluated. Comparison of the simulation results obtained with the two versions of the model and code, as well as that of the predicted and measured radial distributions of the liquid flow rate revealed the need to apply monotonic and yet sufficiently accurate discrete approximations of the convective terms. Failure to do so delays jet break-up, otherwise induced by large turbulent eddies, thereby excessively focuses the predicted flow around its axis. The effect of the pressure drop in the spray nozzle is also examined, and its increase has shown to cause only weak increase of the evaporated fraction and vapor concentration despite the significant increase of flow velocity.


DOI: DOI: 10.1134/S0869864315050091
																								



10.

Study of gas-water flow in horizontal rectangular channels 

E.A. Chinnov1,2,3, F.V. Ronshin1,2, and  O.A. Kabov1,2 


1Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

2Novosibirsk State University, Novosibirsk, Russia

3Novosibirsk State University of Architecture and Civil Engineering, Novosibirsk, Russia

E-mail: chinnov@itp.nsc.ru


Keywords: two-phase flow, flat channel
Pages: 621629
Abstract >>

The two-phase flow in the narrow short horizontal rectangular channels 1 millimeter in height was studied experimentally. The features of formation of the two-phase flow were studied in detail. It is shown that with an increase in the channel width, the region of the churn and bubble regimes increases, compressing the area of the jet flow. The areas of the annular and stratified flow patterns vary insignificantly.


DOI: DOI: 10.1134/S0869864315050108
																								



11.

Modeling of two-layer liquid-gas flow with account for evaporation 

O.N. Goncharova1,2, E.V. Rezanova1,2, Yu.V. Lyulin2,3, and O.A. Kabov2,3 


1Altai State University, Barnaul, Russia

2Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

3National Research Tomsk Polytechnic University, Tomsk, Russia

E-mail: katerezanova@mail.ru


Keywords: convection, thermocapillary interface, bilayer flow, evaporation, exact solution, Soret effect, Dufour effect
Pages: 631637
Abstract >>

Two-layer gas-liquid flows and evaporation  intensity at the interface were studied. The influence of gas flow rate, longitudinal gradient of temperature, the Soret effect on the nature of flow and transfer processes was demonstrated. Experimental and theoretical results were compared; they show dependence of evaporation at the interface on gas flow rates.


DOI: DOI: 10.1134/S086986431505011X
																								



12.

Optimizing modes of a small-scale combined-cycle power plant with atmospheric-pressure gasifier 

I.G. Donskoi1,2, A.Yu. Marinchenko1, A.M. Kler1, and A.F. Ryzhkov2


1Melentyev Energy Systems Institute SB RAS, Irkutsk, Russia

2Ural Federal University, Ekaterinburg, Russia

E-mail: donskoy.chem@mail.ru


Keywords: fixed bed gasification of coal, small combined cycle plant, mathematical modeling
Pages: 639646
Abstract >>

The scheme of an integrated coal gasification combined-cycle power plant with small capacity is proposed. Using the built mathematical model a feasibility study of this unit was performed, taking into account the kinetics of physical and chemical transformations in the fuel bed. The estimates of technical and economic efficiency of the plant have been obtained and compared with the alternative options.


DOI: DOI: 10.1134/S0869864315050121
																								



13.

Finding of parameters of helical symmetry for unsteady vortex flow based on phase-averaged PIV measurement data 

I.V. Litvinov, D.K. Sharaborin, and S.I. Shtork 


Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

Novosibirsk State University, Novosibirsk, Russia

E-mail: litvinov@itp.nsc.ru


Keywords: processing vortex core, PIV, helical vortex theory
Pages: 647650
Abstract >>

The phase-averaged velocity distributions were applied for calculation of parameters of  a  precessing vortex core; these were the input data for calculation of precession frequency by a formula derived from the helical vortex theory. It was demonstrated that the calculated frequency is within 10% error from the frequency measured in experiments. These results confirm the theory validity, and this opens opportunities for analysis of mechanisms controlling the precessing vortex core and external factors.


DOI: DOI: 10.1134/S0869864315050133
																								



14.

Effect of physical properties of liquid on the outflow of the wall liquid film with the co-current gas flow from the nozzle into vacuum 

V.N. Yarygin, V.G. Prikhodko, I.V. Yarygin, and Yu.N. Vyazov 


Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

E-mail: yarygin@itp.nsc.ru


Keywords: wall liquid film, co-current gas flow, nozzle, outflow into vacuum
Pages: 651653
Abstract >>

The constitutive effect of physical properties of liquid (pressure of saturated vapors and heat of vaporization) and the value of pressure in the vacuum chamber on the behavior of wall liquid film flowing into vacuum was determined experimentally. This behavior is characterized by liquid film rise, disintegration into droplets, and cooling down to freezing. 


DOI: DOI: 10.1134/S0869864315050145
																								



15.

75th Anniversary of Vyacheslav N. Yarygin 

Editorial Board 


Siberian Branch of the RAS, Novosibirsk, Russia


Pages: 655656
Abstract >>
On September 21, 2015, Doctor of Technical Sciences, Professor Vyacheslav N. Yarygin was 75 years of age

DOI: DOI: 10.1134/S0869864315050157