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Mitrofanova, O. V.

doi:10.1023/a:1025172018351

Cited by 22 publications

(3 citation statements)

References 31 publications

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“…With a decrease in the number of channels in the swirler from 40 to 8, the swirler resistance decreased by 15%, which the numerical simulation confirmed. An analysis of the velocity profile revealed that for 8 channels, the outcoming gas flows do not contact each other, while for 40 channels, they mix, which, according to [31,32], generates more turbulence in the flow, and, therefore, increases the pressure drop.…”

Section: Influence Of the Channel Wall Slope Angle On Swirler Resistancementioning

confidence: 99%

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

et al. 2022

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This paper presents and patents new profiled- and annular-channel tangential swirlers with 1.8–3 times less hydraulic drag coefficient compared to swirlers with straight channel walls at the same flow rate, respectively. The results of numerical simulation of the gas velocity and pressure profiles for tangential swirler channels of different structures are presented. The modelling was carried out with the help of OpenFOAM software using the k-ε turbulence model. It is found that the shape of the velocity profile at the channel inlet has a decisive influence on the swirler drag coefficient. The greatest contribution to the total drag coefficient of the tangential swirler is made by the pressure drop at the channel inlet compared to the pressure drop at the channel wall and the channel outlet. The experimental dependencies of the tangential swirlers’ drag coefficient on the Reynolds number with a gas criterion of 2000–20,000 and the following structural channel parameters: width 1, 2–9 mm, height 1, 5–10 mm, number 5–45 units, inclination angle 0–45° are presented. The experimental data were compared with the modelling calculations and the convergence of data was achieved. The generalized dependence for the measurement of the hydraulic drag coefficient of three types of tangential swirlers considering the effect made by the geometric parameters (flow rate, width and height of the channel, wall inclination angle) on the pressure drop has been determined; it can be useful at the unit design stage as it allows for reducing the calculation time of the swirler parameters.

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Section: Influence Of the Channel Wall Slope Angle On Swirler Resistancementioning

confidence: 99%

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

et al. 2022

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“…Analysis of the existing experimental database [1] that identifies the physical features of turbulent swirl ing flows in channels with vortex generators and the specific experimental results obtained on a BN 600 reactor [2,3] enables us to distinguish the governing factors that affect the vortical structure of coolant flows. These factors include design features of the thermal hydraulic circuit, i.e., variability of the cross section, turns, the presence of spacers, etc., that deter mine the curvature of streamlines, the flow swirl, and the presence of the local pressure gradients; the elec trical conductivity and thermophysical properties of the fluid; and the presence of the swirling sources, for example, centrifugal pumps, and an external magnetic field that causes MHD effects.…”

Section: Introductionmentioning

confidence: 99%

Simulation of magnetohydrodynamic effects during large-scale vortices generation in a liquid-metal coolant

2015

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This investigation is aimed at establishing the interrelation between the generation of a large scale vortical motion and magnetohydrodynamic (MHD) effects in liquid metal nuclear power plant coolants. The subjects of the study are three dimensional liquid sodium flows in the presence of an external transverse magnetic field in bent and in rectilinear cylindrical channels with obstacles inside of them with different geometries that generate a large scale vortical motion. To establish the governing dimensionless criteria and their influence on the distribution of the velocity and the magnetic fields, analytical solutions of the Hart mann problem were found to a 2D approximation. A numerical 3D simulation identified the regions of the most intensive induced magnetic field for the 3D Hartmann flow under consideration. The spatial distribu tions of the fields of the velocities, the vorticity, and the magnetic induction are obtained considering the posi tion of the flow disturbance source. A correlation is found between the vortex formation effects in channels with a complex geometry and the fluctuations of the magnetic field induced in the area where the vortical structures are localized on imposition of a static magnetic field.

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“…Saug-und Druckseite ist bei hohen Rotationszahlen in Hinblick auf lokale Temperaturverteilungen zu berücksichtigen. Eine umfangreiche Zusammenstellung zu den aerodynamischen und thermodynamischen Effekten von Drallströmungen ist inMitrofanova (2003) zu finden. Neben den diskutierten grundlegenden Effekten sowie den Vor-und Nachteilen verschiedener Geometrien wird außerdem ein Überblick über die Herausforderungen bei der numerischen Berechnung von diesen Strömungen gegeben.…”

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Bewertung neuer Verfahren zur K"uhlung von Turbinenrotorschaufeln. Infrarotthermographie bei maschinen"ahnlichen Randbedingungen

Elfner¹

2019

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Cited by 22 publications

References 31 publications

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

Experimental Study and Numerical Simulation of Hydrodynamic Parameters of Tangential Swirlers

Simulation of magnetohydrodynamic effects during large-scale vortices generation in a liquid-metal coolant

Bewertung neuer Verfahren zur K"uhlung von Turbinenrotorschaufeln. Infrarotthermographie bei maschinen"ahnlichen Randbedingungen

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