Begell House Inc.
Heat Transfer Research
HTR
1064-2285
37
6
2006
Mechanisms of the Self-Organization of Tornado-Like Jets Flowing Past Three-Dimensional Concave Reliefs
467-494
G. I.
Kiknadze
INVENTORS NETWORK GMbH, 5 Fuerst-Wilhelm-Strasse, D-72488, Sigmaringen, Germany
I. A.
Gachechiladze
INVENTORS NETWORK GMbH, 5 Fuerst-Wilhelm-Strasse, D-72488, Sigmaringen, Germany
V. G.
Oleinikov
BASERT, 11 Bryusov Al., Moscow, Russia
V. V.
Alekseev
BASERT, 11 Bryusov Al., Moscow, Russia
The mechanisms underlying the phenomenon of the self-organization of tornado-like jets incorporated into a continuous medium stream and induced by three-dimensional reliefs of double curvature indented on streamlined surfaces are presented.
Use of Twisted Air Flows to Increase the Thermal Efficiency of a Chimney-Type Evaporative Cooling Towers of Steam and Atomic Power Plants
495-500
A. V.
Vlasov
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
V. F.
Davidenko
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
G. V.
Dashkov
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
A. D.
Solodukhin
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
N. N.
Stolovich
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
V. D.
Tyutyuma
A. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15 P. Brovka Str., Minsk, 220072, Belarus
The results of long-term investigations of carried out at the Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus and practical developments with the use of twisted air flows to increase the thermal efficiency of evaporative cooling towers are discussed in the paper.
Computational-Experimental Investigation of Flow in the Sprayer Module of a Combustion Chamber of TAPS Circuit Design
501-514
V. V.
Tret'yakov
P. I. Baranov Central Scientific-Research Institute of Aircraft Engines, 2 Aviamotornaya Str., Moscow, 111250, Russia
Sergei Yu.
Krasheninnikov
Central Institute of Aviation Motors (CIAM), 2 Aviamotornaya St., Moscow, 111116, Russia
Aleksey Konstantinovich
Mironov
Central Institute of Aviation Motors (CIAM), 2 Aviamotornaya St., Moscow, 111116, Russia
This paper is devoted to the problems of experimental and numerical investigation of the flow field in the sprayer module of a combustion chamber with homogenization of a fuel−air mixture (MOHOM) developed at the Central Scientific-Research Institute of Aircraft Engines. The adopted technique of computation of flow is based on numerical integration of Reynolds equations written in terms of the velocity−pressure variables for the case of a stationary turbulent twisted flow of constant density. The work was aimed at development of the technique of calculating a twisted turbulent flow in regions of complex shape by comparing predictions with the experimental data obtained for the case of escape into an open space. The calculations have shown that the characteristics of flow at the exit from a swirler correspond to experimental data with an accuracy sufficient for practice, in both velocity profiles and dimensions of the zone of backflows. The technique developed was used to calculate the hydrodynamics of flow inside the sprayer module with a mixing chamber in order to elucidate the influence of the structure parameters of swirlers. Data were obtained in a wide range of change of flow twistings.
Numerical Simulation of a Turbulent Diffusion Combustion with a Small Vorticity Parameter with the Aid of FLUENT CFD Package
515-526
A. A.
Solomatnikov
Leningrad Metal Works in St. Petersburg, 18 Sverdlovskaya Quay, St. Petersburg, 195009, Russia
D. A.
Lysenko
Leningrad Metal Works in St. Petersburg, 18 Sverdlovskaya Quay, St. Petersburg, 195009, Russia
To test and verify the FLUENT CFD package for a class of flows with turbulent diffusion flames (at a small vorticity parameter), a detailed comparison of the results of numerical simulation and experimental data is given. To compare the results of numerical simulation, we selected the well-known and documented experimental investigation of diffusion combustion of a gaseous fuel (40%CO, 30%H2, 30%N2) carried out by a group of researchers [1-2], where the fields of average velocity, temperature, and of the mass fractions of the components N2, O2, CO2, H2O, H2, CO, OH, and NO are presented rather comprehensively.
Effect of the Direction of Coolant Supply to Holes on the Vortical Structures Formed in Screen Cooling
527-540
S. V.
Veretennikov
Rybinsk State Aviation Technical University named after P.A.Solovyov,
Rybinsk, Russia
The results of an experimental investigation of screen cooling of a plate for two variants of coolant supply to holes is considered: when a coolant flows parallel to the main stream and when it flows normally to the main stream. The experiments were carried out with the aid of a nonstationary technique using liquid crystal heat-indicators. The experimental data were processed with the aid of the least squares methods. The paper presents the results of numerical simulation of screen flow in the case of a normal direction of coolant flow relative to the main stream direction. The numerical simulation made it possible to reveal a complex structure of the coolant flow (of vortical nature) in a perforation hole.
Heat Transfer Intensification in Steam-Generating Rod Fuel Assemblies with the Aid of Local Swirlers of a Coolant Flow
541-549
V. N.
Smolin
N. A. Dollezhal Scientific-Research and Designing Institute of Power Facilities, 2/8 Malaya Krasnoselskaya Str., Moscow, 101000, Russia
The paper presents the results of investigation of heat-transfer intensifiers made on the basis of a standard spacing lattice of a high-power channel type reactor (HPCTR). It is shown that the intensifiers investigated produce an effect of the 1.5-fold increase in the limiting power of the steam generating fuel assembly as against a standard one.
Heat Transfer during Flow Twisting in a Channel of Square Cross Section
551-560
Yu. I.
Shanin
"Luch" Scientific-Research and Production Association, 24 Zheleznodorozhnaya Str., Podolsk, 142100, Russia
Experimental results on the drag ξ, reduced heat transfer αred, surface heat transfer α on one-sided thermal loading in cooling copper channel systems, in which, to intensity heat transfer, spiral tapes are inserted with a step of dh/2H ≈ 0.015-0.115. The data obtained for water as a coolant in the range of Reynolds numbers 200 ≤ Re ≤ 310 are generalized piecewise by exponential dimensionless equations. The strongest differences from the channel system without intensifiers for relative resistance and heat transfer is observed in the region of Reynolds numbers Re = 300-8000 with a maximum attained at Re = 1000; at dh/2H = 0.115 the heat-transfer rate is doubled on a 2.3-fold increase in the drag.
Numerical Investigation of the Hydrodynamics and Heat Transfer in a Tube with a Spiral Tape
561-570
A. M.
Erokhina
Moscow Power Engineering Institute (Technical University), 14 Krasnokazarmennaya Str., Moscow, 111250, Russia
Alexander T.
Komov
National Research University "Moscow Power Engineering Institute", Russia, 111250 Moscow, Krasnokazarmennaya str., 14
Yu. N.
Tokarev
Moscow Power Engineering Institute (Technical University), 14 Krasnokazarmennaya Str., Moscow, 111250, Russia
This work is devoted to theoretical investigation of heat transfer and hydrodynamics in a cylindrical tube with a coiled tape for Reynolds numbers 200-3600 and small twist pitches. A numerical solution of full Navier-Stokes and energy equations is obtained using the FLUENT applied program package. The fields of the distribution of thermodynamic parameters have been obtained. The nonstationarity of the Taylor-Goertler vortices has been revealed and, based on this, the conclusion on the possible incipience of a high-scale turbulence in swirled regions at small Reynolds numbers has been made.