Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data

Čantrak, S.; Janković, Novica Z.

doi:10.3390/en15155417

Cited by 4 publications

(2 citation statements)

References 19 publications

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“…The result proposed a new idea for turbines with variable blade geometry to solve the problem of low turbine efficiency [20]. Djordje S. Cantrak et al [21] conducted experimental research on turbulent eddies behind an axial flow fan installed in a pipeline on a test bench with a free inlet and a pipeline outlet. Turbulent vortices in many turbine systems [22] consumed enormous amounts of energy.…”

Section: Computational Modelmentioning

confidence: 99%

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

et al. 2023

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In recent years, more and more attention has been paid to research on variable geometry turbine engines with the increasing requirement of engine performance. Variable geometry turbine technology can significantly improve the operating performance of aero engines. Adjusting the working angle of the turbine guide vane can change the thermodynamic cycle of the engine operation, so that the turbine can respond to different engine operating conditions. Variable geometry turbines work in harsh environments. Therefore, the design of the variable geometry turbine needs to consider the effect of thermal deformations of the mechanism on operational stability. There are few research studies on variable geometry turbine adjusting mechanisms. This paper established the numerical calculation models of two adjusting mechanisms by integrating fluid mechanics, heat transfer, and dynamic theories, which are paddle and push–pull rod mechanisms. The models were applied to study the effects of components’ thermal deformations and flexible bodies on the motion characteristics of the adjusting mechanism. Furthermore, the performance of the two adjusting mechanisms was compared. The calculation results show that the paddle rod adjusting mechanism can accurately adjust the angles of guide vanes. The paddle rod adjusting mechanism has a larger driving stroke and smaller driving force than the push–pull rod adjusting mechanism. The paddle adjustment mechanism was better suited to the operational requirements of the variable geometry turbine. The research results of this paper are relevant to the design of variable geometry turbine regulation structures.

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Section: Computational Modelmentioning

confidence: 99%

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

et al. 2023

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“…Vortex dynamics, vorticity and vortex detection, as well as turbulence structure investigation of the turbulent swirl flow behind the axial fan on the simpler test rig, with application of the invariant theory is reported in Čantrak and Janković. 13…”

Section: Introductionmentioning

confidence: 99%

High speed stereoscopic PIV investigation of the statistical characteristics of the axially restricted turbulent swirl flow behind the axial fan in pipe

Čantrak

Janković

2022

Advances in Mechanical Engineering

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Investigation of the turbulent swirl flow in the piping system is one of the most complex investigations in the field of energetics and turbulence. Axial fans in a pipe, without guide vanes, are widely used in practice and the problem of their duty point and energy efficiency is still extensively discussed. Analysis of the interaction between axial fans energy and construction parameters is one of the main topics in defining the fans energy efficiency potential. On one side, there is a three-dimensional velocity field in the wall-bounded flow with regions of great turbulence intensity. On the other side, there is a complex blade geometry, which generates the turbulent swirl flow. This paper presents research on the turbulent swirl flow, Rankine type, in an axially restricted system, using high-speed stereo particle image velocimetry (HSS PIV). Axial fan impeller, with outer diameter 0.399 m and nine twisted blades is the flow generator. The Reynolds number Re = 176,529 is achieved in the pipe. Reynolds stresses, statistical moments of higher order, and invariant maps are calculated based on the three component velocity fields. Here, intensive changes of all statistical parameters occur in radial and axial direction. In the flow region, four flow regions can be identified. Interaction of all these four flow regions produces extremely complex turbulent swirl flow, which is generated behind the axial fans. Determined invariant maps reveal turbulence structure. It is shown that the state of turbulence on the pipe axis is three-component isotropic, which is contrary to the case of axially unrestricted turbulent swirl flows. In the rest of the space, in the region up to r/ R = 0.52, the states of turbulence occur in the area in between the boundaries which designate axis-symmetric turbulence (contraction) and axis-symmetric turbulence (expansion), in the vicinity of the state of three-component isotropic turbulence.

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Large-scale vortex generation (and bursting) using windshapers

Noca,

Reymond,

Walpen

et al. 2024

AIAA SCITECH 2024 Forum

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Turbulence Structure and Dynamics Investigation of Turbulent Swirl Flow in Pipe Using High-Speed Stereo PIV Data

Cited by 4 publications

References 19 publications

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

Angle-Regulating Rule of Guide Vanes of Variable Geometry Turbine Adjusting Mechanism

High speed stereoscopic PIV investigation of the statistical characteristics of the axially restricted turbulent swirl flow behind the axial fan in pipe

Large-scale vortex generation (and bursting) using windshapers

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