Experimental investigation of the machine-free method of temperature separation of air flows based on the energy separation effect in a compressible boundary layer

Leontiev, A. I.; Zditovets, A.G.; Vinogradov, Yu. A.; Стронгин, М. М.; Kiselev, N. A.

doi:10.1016/j.expthermflusci.2017.05.021

Cited by 33 publications

(7 citation statements)

References 31 publications

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“…Another field of application is machine-free energy separation devices, such as the Ranque-Hilsch tube (Eiamsa-ard & Promvonge 2008) and the Leontiev tube (Leont'ev 1997;Leontiev et al 2017), which convert a gas flow into two output flows with significantly different stagnation temperatures without external heat supply and work. Ways of increasing the effectiveness of the Leontiev tube is the subject of much current research (Azanov & Osiptsov 2017;Kiselev et al 2019;Leontiev et al 2019).…”

Section: Introductionmentioning

confidence: 99%

The Eckert–Weise effect and energy separation under the flow interference behind side-by-side cylinders

Aleksyuk

2021

J. Fluid Mech.

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Section: Introductionmentioning

confidence: 99%

The Eckert–Weise effect and energy separation under the flow interference behind side-by-side cylinders

Aleksyuk

2021

J. Fluid Mech.

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“…This problem has been discussed in quite a few studies [1][2][3][4][5][6][7]. The interest in the phenomenon of energy separation can be partially explained by the attempts to make energy separation devices more efficient (see, for example, the Ranque-Hilsch vortex tube and the Leontiev tube [8][9][10]). Another reason for the increased attention to the problem of energy separation in the wake behind bluff bodies is the study of the Eckert-Weise effect, which is manifested in low recovery temperature at the rear part of a thermally insulated cylinder [11].…”

Section: Introductionmentioning

confidence: 99%

Influence of vortex street structure on the efficiency of energy separation

Aleksyuk

2019

International Journal of Heat and Mass Transfer

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Regions with reduced and increased values of total enthalpy are observed in a time-averaged flow behind a bluff body. This energy redistribution takes place both in the vortex formation region and in the developed vortex wake. The present paper focuses on studying the effect of the structure of a vortex street on the intensity of energy redistribution. Two approaches are used. The first one is direct numerical simulation of the flow behind a transversely oscillating cylinder, which is known for a variety of vortex patterns in the wake. The simulations are based on a finite element solution of the Navier-Stokes equations for a compressible perfect viscous gas. The second approach is based on simplified point vortex models for infinite periodic vortex streets, which contain a finite number of vortex chains in equilibrium. It turns out that these simple models make it possible to obtain satisfactory qualitative results, particularly if a more precise approximation of velocity fields in the vortex cores (Rankine vortices) is implemented. It is shown that the effect of energy redistribution significantly depends on the vortex structure, namely the mutual arrangement of the vortices and their intensities. The estimates of the energy separation efficiency in the time-averaged flow are obtained for the general case of an arbitrary number of chains. A more detailed analysis is performed for vortex streets with 2, 3, and 4 vortex chains.

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“…Например, известен эффект «аэродинамического охлаждения» стенки, проявляющийся в уменьшении адиабатной температуры стенки до значений даже ниже статической температуры (коэффициент восстановления температуры становится меньше нуля) при поперечном обтекании дозвуковым потоком цилиндра в области задней критической точки (эффект Эккерта -Вайзе) [9][10][11][12][13]. В работе [13] было продемонстрировано, что эффект температурной стратификации распространяется ниже по потоку в следе за цилиндром.…”

Section: Introductionunclassified

Aerodynamic cooling for supersonic wake flow behind a backward-facing step

Попович¹

2019

PhChGD

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The results of an experimental study of the effect of reducing the adiabatic wall temperature (aerodynamic cooling) for a case of separated supersonic flow behind a backward-facing ledge are presented. The study was conducted on unsteady-state regime during the launching a wind tunnel before reaching the equilibrium thermal state. The parameters of thermal gas dynamics were compared with the results obtained for the case of continuous flow around the smooth wall. The free-stream Mach number was 2.2, the Reynolds number along the length of the dynamic boundary layer was at least 20 million at the nozzle exit section. The height of the step ranged from 8 to 12 mm. The graphs of the wall temperature, stagnation flow temperature, adiabatic wall temperature, the total and static pressure, the heat flux, the distribution of the temperature recovery coefficient and the relative Stanton number along the length of the model are presented. The studies were carried out in the joint inter-university laboratory of MSU-BMSTU "Thermal Gas Dynamics" on the experimental base of the

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Experimental investigation of the machine-free method of temperature separation of air flows based on the energy separation effect in a compressible boundary layer

Cited by 33 publications

References 31 publications

The Eckert–Weise effect and energy separation under the flow interference behind side-by-side cylinders

The Eckert–Weise effect and energy separation under the flow interference behind side-by-side cylinders

Influence of vortex street structure on the efficiency of energy separation

Aerodynamic cooling for supersonic wake flow behind a backward-facing step

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