Thermophysics and Aeromechanics

Kharitonov, A. M.;Zvegintsev, V. I.;Vasenev, L. G.;Kuraeva, A. D.;Nalivaichenko, D. G.;Novikov, A. V.;Paikova, M. A.;Chirkashenko, V. F.;Shakhmatova, N. V.;Shpak, S. I.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010011

Abstract The structure and principle of operation of a new wind tunnel AT-303 with adiabatic compression are described. Results of systematic investigations are presented in terms of velocity distributions both at the nozzle exit and in the region where the models are located. The velocity fields are obtained with the use of total pressure probes in the ranges of Mach numbers from 7.6 to 19.7 and Reynolds numbers per meter Re1 = (0.25−3.64)·107.

Sidnyaev, N. I.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010023

Abstract The experimental approach is outlined for study of heat fluxes on the surface of a blunt body of revolution (with kinked generatrix) in a hypersonic gas flow. The main attention is paid to the effect of coolant injection flow rate on resulting heat flux at different Reynolds numbers and attack angles. The significant role of distributed gas blowing on a body surface for the heat flux distribution has been demonstrated.

Rychkov, A. D.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010035

Abstract We present the results of designing the contours of supersonic parts of the solid-propellant rocket motor (solid motor) nozzles with high expansion ratios with the aid of direct variational methods. A continual model is used for the motion of a two-phase polydispersed continuum with regard for processes of interaction both between the carrying gas and the particles suspended in it and between the particles of various fractions. The method of local variations is employed as a numerical method of searching for the extremum of a multivariate function. The computational results evidence a fair efficiency of the proposed approach for the optimization of such nozzles.

Soldatkin, A. V.;Andrievsky, A. P.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010047

Abstract The development of a non-self-similar liquid-liquid jet of a non-Newtonian reactive liquid is considered with in the framework of the boundary layer theory. The analytic expressions are obtained on the basis of the local similarity method for variation of integral parameters of jet flow along its axis, which agree fairly well with the numerical solution of a non-self-similar problem.

Ilyushin, B. B.;Krasinsky, D. V.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010059

Abstract Large Eddy Simulation (LES) of turbulent free round jet submerged in water has been performed at Reynolds number Re = 25 000. LES results are compared against the PIV measurements data for the same flow configuration. The processes of the mixing layer formation in the jet initial region and its evolution down-stream have been studied with the analysts of turbulent power spectra. The effect of the subgrid Smagorinsky model coefficient C s on the jet hydrodynamics has been studied.

Isaev, S. A.;Baranov, P. A.;Kudryavtsev, N. A.;Lysenko, D. A.;Usachov, A. E.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010060

Abstract A joint testing of the specialized (VP2/3) and universal (FLUENT) packages of applied programs of the hydrodynamic and thermophysical profile is carried out on the basis of the solution of a well-known problem of recirculation flow of a viscous incompressible fluid in a lid-driven square cavity. The Reynolds-averaged Navier — Stokes equations are solved with the aid of implicit factored computational procedures. The adequacy of chosen one-, two-, four-parametric semiempirical differential models of turbulence is analysed in detail.

Chernorai, V. G.;Kozlov, V. V.;Loefdahl, L. L.;Grek, G. R.;Chun, H. H.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010072

Abstract Results of experimental investigations of the nonlinear stage of sinusoidal and varicose instability of a streaky structure, which leads to multiplication of streaky structures and origination of coherent structures (such as Λ-structures), are presented. Riblets suppress the intensity of streaky structures, stabilize the flow against the development of the secondary high-frequency instability of streaky structures, and, for this reason, delay spatial turbulization of the flow. The results of these investigations can be useful for understanding the flow structure in such situations and for possible controlling of the coherent structures aimed at flow stabilization.

Shapar, E. M.;Kalaidin, E. N.;Demekhin, E. A.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010084

Abstract The system of Dressler hydraulic equations is presented for description of 3D perturbations. Dressler’s idea about an absence of solution singularity was considered for investigation of tolerance of the 2D roll-waves for 2D and 3D perturbations; the spectra were plotted. The result on stability of stationary roll-waves of the soliton type was obtained.

Pavlenko, A. N.;Matsekh, A. M.;Pecherkin, N. I.;Kneer, R.;Lel, V. V.;Surtaev, A. S.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010096

Abstract Experimental data on heat transfer with intense evaporation in the falling films of liquid nitrogen were analysed. According to data generalization, heat transfer at evaporation becomes more intense under the precrisis modes at high heat fluxes for two studied boundary conditions on the heat-releasing surface: T w ≈ const and q w ≈ const. The relative contributions of conductive and convective components of heat transfer for different heat fluxes were estimated due to statistical treatment of the wave characteristics carried out by the capacitance probes for measurement of the local liquid film thickness. It was found out that heat transfer intensification is mainly caused by a drastic decrease in thermal resistance of the local zones with intensely evaporating residual layer between large waves. At that, the convective component of heat transfer related to wave perturbations on a free surface of a liquid film decreases significantly with a rise of heat fluxes. New data on pulsations of the local temperature of the heat-releasing surface were obtained at different points along the flow with the modes of “dry spot” formation.

Shilyaev, M. I.;Tolstykh, A. V.;Khromova, E. M.

2006 Thermophysics and Aeromechanics

doi: 10.1134/S1531869906010102

Abstract The models of heat and mass transfer in foam scrubbers and centrifugal-bubbling apparatuses developed previously by the authors are refined. This upgrade takes into account the Stefan flow at high humidity of the treated air.