Two spiral vortex breakdowns in confined swirling flow

Tsoy, M. A.; Skripkin, Sergey; Litvinov, Ivan V.

doi:10.1063/5.0154809

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…in conical diffusers and their possible application in various fields [28][29][30][31][32][33]. For example, M. Tsoy and colleagues studied in detail the development and destruction of spiral vortices in conical diffusers with different cone expansion angles [28]. Similar studies were carried out by X. Zhou and colleagues in relation to vortex cores and their influence on flow characteristics in CDs.…”

Section: Introductionmentioning

confidence: 92%

“…There are comprehensive studies of the gas-dynamic features of complex flows (swirl flows, spiral vortices, vortex cores, etc.) in conical diffusers and their possible application in various fields [28][29][30][31][32][33]. For example, M. Tsoy and colleagues studied in detail the development and destruction of spiral vortices in conical diffusers with different cone expansion angles [28].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Supply Channel Design on the Gas-Dynamic Structure of Air Flow in a Vertical Conical Diffuser

Plotnikov,

Ryzhkov

2023

Applied Sciences

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Vertical conical diffusers are used in power engineering, chemical industry, technological processes, and other industries. The efficiency of many machines and pieces of equipment is determined by the gas-dynamic and heat-exchange perfection of processes in diffusers. This study assesses the influence of the air supply method on flow structure in a diffuser. The studies were carried out on a test bench with thermal imaging for air flow rates ranging from 0.018 to 0.057 m3/s (42,500 < Re < 150,000). Two designs were examined: (1) a conventional air supply through one channel from below and (2) a nozzle air supply through four tubes at an angle of 45° to the vertical axis. In addition, the influence of the cross-sectional shape of the supply channels of both designs was studied. It is established that the use of a conventional air supply through one channel leads to the generation of a pronounced central flow along the vertical axis (all configurations of the supply channel) and the creation of stagnant zones in the corners of the diffuser (round and triangular channels; the use of a square supply channel causes the most uniform air distribution throughout the entire volume of the diffuser (while maintaining the central flow). It is found that with nozzle air supply, there are no stagnant zones in the corners and intense air movement generation in the centre of the diffuser (round and triangular tubes) can be observed; the use of square nozzle tubes causes intense flow movement at the base of the diffuser, which quickly collapses upstream, uniformly filling the entire volume of the diffuser’s cylindrical part. The presented data can be useful for designing various machines and pieces of equipment with vertical conical diffusers.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

The Influence of Supply Channel Design on the Gas-Dynamic Structure of Air Flow in a Vertical Conical Diffuser

Plotnikov,

Ryzhkov

2023

Applied Sciences

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“…Spiral-type and bubble-type vortex breakdowns in a swirling flow through circular pipe were reviewed by Leibovich [2] and were later studied numerically by Delery [3]. Recently, two spiral vortex breakdowns were observed experimentally and numerically by Tsoyet al [4] in a conical diffuser driven by radial guide vanes. Vogel [5] observed bubble-type vortex breakdown inside a closed cylinder filled with fluid and with one rotating end and presented a map of the breakdown bubbles in an aspect ratio-Reynolds number plane.…”

Section: Introductionmentioning

confidence: 99%

Vortex breakdown in the small Mach number regimes

Dhurandhar,

Sharma,

Mohan

et al. 2024

Phys. Scr.

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The effect of compressibility for flow inside the cylinder with the top rotating lid (Vogel-Escudier flow) is examined. Three-dimensional Navier-Stokes equations for compressible flow in Cartesian coordinates are used to simulate the flow using open-source OpenFOAM software. The Mach number (Ma) of the flow is varied from 0.1 to 0.3, and the Reynolds number (Re) is varied from 1000 to 5000 for a fixed aspect ratio (Γ = 2.5) of the cylinder. The flow is found to have a transition from a steady axisymmetric state to a non-axisymmetric state exhibiting multiple azimuthal waves as the Mach number and the Reynolds number are varied. The flow field changes significantly with an increase in Ma for unsteady flow at higher Re. An increase in Ma increases the side wall azimuthal instability, as found in the perturbation contour plots and time series analysis. Further, we reconstruct phase portraits to show the dynamics of the flow finally becoming chaotic as the Reynolds number is increased to 5000. Finally, we support the argument with Lyapunov exponents for the higher Re samples. The Lyapunov Exponent is found to increase with Ma.

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“…The turbulent characteristics of the pump were established through numerical simulation. Tsoy et al [10] observed two different types of spiral vortex rupture and conducted further numerical research on the vortex entering the conical diffuser. In addition, the coexistence of two spiral eddies was also observed.…”

Section: Introductionmentioning

confidence: 99%

Study of blade moment calculation on variable geometry turbine adjusting mechanism

Zhong,

Chen,

Qin

et al. 2024

J. Phys.: Conf. Ser.

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In recent years, the layout of rotary instructing leaves in mutable loop worm wheels has been a research hotspot. The rotary instructing leaves are subjected to the action of hyperthermal and nippy airstream and the influence of frictional force on the spin axis. For the rotary instructing leaves, the combined action of hyperthermal and nippy airstream generates an aerodynamical moment, while frictional force generates a frictional moment. When the rotary instructing leaves rotate, the aerodynamical moment and frictional moment constantly change as the angular motion of the blades. This research is rare, and there is no mature case for reference. The article applies fluid-structure coupled heat transfer and software programming to seek the blade moment. During the process of blade angular motion from -10° to +10°, the total moment of the blade earlier rises and afterward falls. When the blade angular position is -2°, the total moment runs to vertex 3.74489 N·m. Test data from the exploration laboratory have validated this conclusion. The maximum deviation compared to the test data of the exploration laboratory is 4.562%. The aerodynamical and frictional moments are momentous indicators for mutable loop worm wheel study. They can offer physical references for the mutable loop design of a turbo. The paper can also offer a new method for the blade moment calculation. This is important sense for the innovation of mutable cyclic worm wheels.

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Two spiral vortex breakdowns in confined swirling flow

Cited by 4 publications

References 24 publications

The Influence of Supply Channel Design on the Gas-Dynamic Structure of Air Flow in a Vertical Conical Diffuser

The Influence of Supply Channel Design on the Gas-Dynamic Structure of Air Flow in a Vertical Conical Diffuser

Vortex breakdown in the small Mach number regimes

Study of blade moment calculation on variable geometry turbine adjusting mechanism

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