Supersonic flow round blunt perforated screens

Guvernyuk, S. V.; Savinov, K. G.; Ul'yanov, G. S.

doi:10.1007/bf01097374

Cited by 6 publications

(5 citation statements)

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“…2a shows that the lattice flow in regime A with a bow shock is accompanied by the formation of a large-scale supersonic bottom jet typical of the double choking regime described and observed experimentally in [1]. This term means that, first, small perturbations behind the screen cannot propagate into the subsonic region in front of the screen, so the shock-layer flow in front of the screen is independent of the leeward flow parameters (accordingly, the flow can be determined independently with the help of the choking boundary condition [1]). Second, the presence of a supersonic flow in the bottom region domain means that the small perturbations not only cannot penetrate into the forward subsonic region through the screen holes, but also cannot influence the drag force of the screen (see [7]).…”

Section: Comparison With the Theory Of Permeable Surfacesmentioning

confidence: 76%

“…For small and moderate values of , the typical supersonic flow pattern over the permeable screen is one with a smooth detached shock in front of the screen (see [1]). This flow pattern will be referred to as regime A.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

“…Thus, the solution of the particular shock-layer flow problem also completely determines the flow forcing on the screen. The double choking regime of is one of the most typical flow patterns in the supersonic flow past a blunt permeable screen with a moderate value of σ (see [1]). …”

Section: Comparison With the Theory Of Permeable Surfacesmentioning

confidence: 99%

“…A lattice of cylinders is the simplest example of a permeable screen representing a set of numerous small-scale solids distributed over a relatively thin layer that is much longer than the scale of the permeability structure [1]. The supersonic flow over a regular lattice of cylinders is of interest as a test problem, with the use of which the relation between the outer large-scale and local near-wall flows over the permeable body can be analyzed in detail by applying numerical simulation [2].…”

Section: Introductionmentioning

confidence: 99%

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Supersonic flow past a flat lattice of cylindrical rods

Guvernyuk

Maksimov

2016

Comput. Math. and Math. Phys.

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Two-dimensional supersonic laminar ideal gas flows past a regular flat lattice of identical circular cylinders lying in a plane perpendicular to the free-stream velocity are numerically simulated. The flows are computed by applying a multiblock numerical technique with local boundary-fitted curvilinear grids that have finite regions overlapping the global rectangular grid covering the entire computational domain. Viscous boundary layers are resolved on the local grids by applying the Navier-Stokes equations, while the aerodynamic interference of shock wave structures occurring between the lattice elements is described by the Euler equations. In the overlapping grid regions, the functions are interpolated to the grid interfaces. The regimes of supersonic lattice flow are classified. The parameter ranges in which the steady flow around the lattice is not unique are detected, and the mechanisms of hysteresis phenomena are examined.

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Section: Comparison With the Theory Of Permeable Surfacesmentioning

confidence: 76%

Section: Formulation Of the Problemmentioning

confidence: 99%

Section: Comparison With the Theory Of Permeable Surfacesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Supersonic flow past a flat lattice of cylindrical rods

Guvernyuk

Maksimov

2016

Comput. Math. and Math. Phys.

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“…Here F y is the friction force acting on the upper part of the plate, m is the mass of the molecule, q is the heat flux, and p xx and p xy are the friction-stress components; integration is performed for Y > 0 over the surface turned toward the incoming flow for quantities marked by the superscript (1) and over the backward surface for quantities marked by the superscript (2). The values of p xx , p xy , and q are found by integration in the space of velocities:…”

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confidence: 99%

Subsonic rarefied gas flow over a rack of flat transverse plates

Popov

Tcheremissine

2008

J Appl Mech Tech Phys

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Parameters of a rarefied gas flow through a rack of flat plates aligned across the flow are studied by means of the joint numerical solution of the Boltzmann and Navier-Stokes equations. A subsonic flow regime is considered. The changes in flow characteristics are calculated as functions of the freestream velocity and plate temperature.Introduction. Akin'shin et al.[1] performed a pioneering experimental study of a rarefied gas flow in a capillary sieve in the range of Knudsen numbers Kn = 10 −4 -10 −1 at different temperatures for several inert gases and determined the dependence of the flow rate on the flow geometry and the character of interaction between molecules and capillary walls. A supersonic flow with Mach numbers M = 2-3 and a Reynolds number Re = 10 6 over perforated screens was studied in [2] by analyzing the effect of injection into the base region on the flow structure. Theoretical results based on the presentation of the perforated screen as a discontinuity surface with relations that take into account the flow structure inside the perforation and the mechanisms of interaction between the gas and the walls were published in [3], and this analytical approach was further developed in [4,5].The results of numerical experiments performed by means of direct statistical modeling of one-dimensional rarefied gas flows through a permeable flat surface can be found in [6]. Steady-state flows in the range of Mach numbers M = 3-10 with different temperatures of the target and accommodation numbers were studied under the assumption that the gas molecule passes through the surface without interacting with the latter with a probability P and becomes scattered with a probability 1−P . In particular, the laws of variation of flow parameters in the "shockdisturbance front" formed ahead of the target were determined, and the difference of this front from the shock-wave structure was found.The necessity of studying subsonic rarefied gas flows is inspired by their importance for practical purposes (motion of the gas in porous solids and capillary membranes in devices for gas separation and cooling). The flow characteristics are determined by interaction of flows around the target elements. These are normally threedimensional structures consisting of cylindrical channels or a set of finite-length plates aligned along or across the flow.It seems of interest to consider systems designed for controlling (generating) flows with prescribed properties without any changes in geometry, by varying the temperature or gas-flow parameters on the wetted surfaces. Such systems are analyzed in the present paper.The numerical solution of the Boltzmann equation, which describes the rarefied nonequilibrium gas dynamics, requires a large volume of computations, because the distribution function to be determined includes a threedimensional space of velocities in addition to spatial variables. Two-dimensional formulations can be currently used for numerical simulations of rarefied gas flows. Even in comparatively simple cases, however, the...

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On Structures of Supersonic Flow Around Plane System of Cylindrical Rods

Guvernyuk

Maksimov

2020

Advances in Theory and Practice of Computational Mechanics

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Supersonic flow round blunt perforated screens

Cited by 6 publications

References 0 publications

Supersonic flow past a flat lattice of cylindrical rods

Supersonic flow past a flat lattice of cylindrical rods

Subsonic rarefied gas flow over a rack of flat transverse plates

On Structures of Supersonic Flow Around Plane System of Cylindrical Rods

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