Von Kàrmàn problem for a rotating permeable disk

Goldstein, R. V.; Gordeev, Yu. N.; Chizhov, Yu. L.

doi:10.1134/s0015462812010061

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The authors reported new findings for laminar regimes [28][29][30]; however, due to an industrial application point of view, turbulent regimes were of a greater interest, as evidenced by numerous studies [28,[31][32][33][34][35][36]. A comprehensive summary of instabilities offers the experimental research that was performed by Schouvelier et al Aiming at particular applications, many extension studies were published, e.g., Soong et al [37] dealt with the influence of edges, other authors studied the effect of surface roughness [38,39], the porosity of the disk [40], or how the disk deformation possibly affects the flow [41,42]. The flow of non-Newtonian fluids over the rotating disks is discussed in [43][44][45], the solution of the flow coupled with heat transfer was presented in [46][47][48], and publications [49][50][51] consider the presence of electromagnetic field and its impact on the flow.…”

Section: Flow Regimes and Patterns In Rotor-stator Cavitymentioning

confidence: 99%

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Zemanová

Rudolf

2020

Energies

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The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machines.

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Section: Flow Regimes and Patterns In Rotor-stator Cavitymentioning

confidence: 99%

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Zemanová

Rudolf

2020

Energies

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“…[8,9,10]. To bring the theoretical knowledge closer to the practical applications, studies dealing with the effect of the edges of the disk [11], the porosity of the disk material [12], the surface roughness [13], the heat transfer [14] were carried out. Aiming the turbomachinery, the influence of the throughflow was also addressed [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Flow Inside the Back-Sidewall Gaps of Centrifugal Pump and its Impact on Axial Thrust

Zemanová

Rudolf

Zubík

2022

IOP Conf. Ser.: Earth Environ. Sci.

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Despite the sidewall gaps of centrifugal pumps are tiny narrow spaces, the flow inside them can have a great impact on the flow field in the whole machine. Regardless of its influence, there is no full understanding of the flow in those regions. A theory exists for the simplified cylindrical cavity with a rotating disk, whose application to real hydraulic machines is questionable. To investigate the flow in the sidewall gaps of centrifugal pumps, a test rig including a real impeller has been built up. It enables observation of the flow in the back-sidewall gap by optical methods and evaluation of axial thrust and torque. The measurements were performed for a range of rotational speeds in order to map possible flow regimes and patterns. It was found out, that the basic theory and map of the flow regimes obtained for a simple rotating cavity is inapplicable for the back-sidewall gaps of real hydraulic machines. The flow field is significantly influenced by the impeller blades, and consequently, the map of the regimes is shifted compared to the one derived for the simple cylindrical cavity with a rotating disk. The discrepancies were described and a new map of flow regimes was introduced.

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Von Kàrmàn problem for a rotating permeable disk

Cited by 2 publications

References 6 publications

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Experimental Investigation of Flow Inside the Back-Sidewall Gaps of Centrifugal Pump and its Impact on Axial Thrust

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