Effect of a Dispersed Admixture on the Flow Pattern and Heat Transfer in a Supersonic Dusty-Gas Flow Around a Cylinder

Volkov, Alexey N.; Tsirkunov, Yu. M.

doi:10.1007/s10697-005-0095-3

Cited by 13 publications

(4 citation statements)

References 14 publications

(23 reference statements)

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“…The question of the magnitude of the resistance experienced by a stationary body in a moving fluid or, conversely, by a moving body in a stationary fluid, belongs to the most ancient problems of hydrodynamics [1,4,7,9]. Despite this, until now it has not been possible to achieve its general theoretical solution, which led to attempts to directly experimentally determine the resistance, thereby giving impetus to the development of experimental hydro -and aerodynamics [2,3,10].…”

Section: Introductionmentioning

confidence: 99%

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On The Question Of Calculation Of The Flow Velocity Distribution When Liquid Flowing Cylindrical Bodies

Samatovich¹

2021

TURCOMAT

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Section: Introductionmentioning

confidence: 99%

“…Eshev Sobir Samatovich 1 , Rakhmatov Mahmud Ismatovich2 , Gayimnazarov Isroil Kholikovich3 , Bobomurodov Furkat Farkhod ogli4 …”

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confidence: 99%

On The Question Of Calculation Of The Flow Velocity Distribution When Liquid Flowing Cylindrical Bodies

Samatovich¹

2021

TURCOMAT

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“…In this case, two-way-coupling, in which the back-coupling of particles to the carrier fluid is considered but particle-particle interactions are ignored, is likely sufficient to capture the relevant physics. Consideration of larger particles would necessitate four-way-coupling (specifically particle-particle collisions) since such particles are reflected at very low speeds, accumulate near the surface, and shield the surface from subsequent incoming particles [5].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Ching

Ihme

2019

AIAA Scitech 2019 Forum

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Recent interest in human-scale Mars missions has motivated research into the effects of dust particles that are suspended in the Martian atmosphere on reentry vehicles. For instance, these dust particles can enhance erosion of thermal protection systems and amplify surface heat fluxes. As such, in this work, we perform numerical simulations of hypersonic dusty flows over a blunt body using a two-way-coupled Lagrangian particle method in a discontinuous Galerkin framework. Due to the lack of a well-established physical model of the disperse phase appropriate for this multiphase flow regime, we aim to evaluate the sensitivities of numerically predicted dust-induced heat flux augmentation to various components and parameters of the model. Specifically, we investigate the drag coefficient correlation, the Nusselt number correlation, different terms in the particle momentum and energy equations, and particle size.

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“…The oscillations in the graphs are, apparently, caused by the scatter (dispersion) of the volume fractions of particles with the number of test particles used in simulations (approximately 2 · 10 6 ). For comparison, we should note that approximately 10 6 particles should be located in the shock layer ahead of the model to obtain the field of the volume fraction of particles in this layer without oscillations [16]. It follows from Fig.…”

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confidence: 97%

Flow of a dispersed phase in the Laval nozzle and in the test section of a two-phase hypersonic shock tunnel

Verevkin

Tsirkunov

2008

J Appl Mech Tech Phy

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An unsteady gas-particle flow in a hypersonic shock tunnel is studied numerically. The study is performed in the period from the instant when the diaphragm between the high-pressure and lowpressure chambers is opened until the end of the transition to a quasi-steady flow in the test section. The dispersed phase concentration is extremely low, and the collisions between the particles and their effect on the carrier gas flow are ignored. The particle size is varied. The time evolution of the particle concentration in the test section is obtained. Patterns of the quasi-steady flow of the dispersed phase in the throat of the Laval nozzle and the flow around a model (sphere) are presented. Particle concentration and particle velocity lag profiles at the test-section entrance are obtained. The particle-phase flow structure and the time needed for it to reach a quasi-steady regime are found to depend substantially on the particle size.Key words: shock tunnel, Laval nozzle, two-phase gas-particle flow, flow around a body, numerical simulations.Introduction. Shock tunnels have been used for experimental research of aerodynamics and physical gasdynamics problems for more than half a century [1]. Comparatively recently, such shock tunnels have been used to study hypersonic dusty-gas flows. The results of research performed in a UT-1M experimental setup at the Central Hydroaerodynamic Institute (TsAGI) are the most well-known ones. A hypersonic two-phase shock tunnel is a classical shock tunnel with an attached hypersonic contoured nozzle generating a high-velocity flow in the test section connected at the end with a vacuum chamber. For a two-phase flow to be produced in the test section, dispersed particles are injected into the high-pressure chamber at the instant of wind-tunnel start-up; these particles are then entrained by the gas flow. The structure of the unsteady gas flow developing in such a shock tunnel after diaphragm opening was studied in detail in [3]. First, a strong shock wave is formed, which moves toward the nozzle. When this wave is reflected from the nozzle walls, transverse shock waves are formed. These waves interact with each other and with the nozzle walls both regularly and irregularly with formation of triple (Mach) configurations. As a result, two intense near-axis vortices come into being and develop in the nozzle throat; later on, these vortices are entrained downstream. At the initial stage, however, these vortices exert a significant effect on the behavior of the particle phase, in particular, on the motion of fine particles. Because of different inertial properties, fine and coarse particles behave differently in an unsteady flow in the nozzle and test section. Coarse particles lag behind the carrier gas, collide with the walls of the converging part of the Laval nozzle, and are reflected from the walls. This results in redistribution of particles in the transverse direction, and the two-phase flow in the test section may become substantially nonuniform. Moreover, because of the lag of the par...

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Effect of a Dispersed Admixture on the Flow Pattern and Heat Transfer in a Supersonic Dusty-Gas Flow Around a Cylinder

Cited by 13 publications

References 14 publications

On The Question Of Calculation Of The Flow Velocity Distribution When Liquid Flowing Cylindrical Bodies

On The Question Of Calculation Of The Flow Velocity Distribution When Liquid Flowing Cylindrical Bodies

Sensitivity study of high-speed dusty flows over blunt bodies simulated using a discontinuous Galerkin method

Flow of a dispersed phase in the Laval nozzle and in the test section of a two-phase hypersonic shock tunnel

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