Flow Visualization and Leakage Measurements of Stepped Labyrinth Seals: Part 2—Sloping Surfaces

Rhode, D. L.; Younger, J. S.; Wernig, Marcus D.

doi:10.1115/1.2841196

Cited by 9 publications

(2 citation statements)

References 8 publications

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“…The flow through sealing structures was the scope of a number of studies, e.g., [70][71][72][73][74][75][76]; however, it has to be pointed out that it should be always related to the overall flow field of the specific hydraulic machine.…”

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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“…The loss in efficiency due to shroud leakage or tip clearance flow accounts for a substantial part of the overall losses in turbomachinery. The losses caused by leakage flow over shrouded blades can be minimized by reducing the leakage, and much effort has been undertaken in this direction [1,2]. Constraints on the design determine the minimum clearance that can be achieved, and reduction of the leakage losses requires optimized sealing arrangements and improvements in the labyrinth seal design.…”

Section: Introductionmentioning

confidence: 99%

The impact of rotor labyrinth seal leakage flow on the loss generation in an axial turbine

Anker

Mayer

Casey

2005

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper examines the impact of labyrinth seal leakage flow over the rotor shroud on the loss generation in an axial turbine stage. Numerical studies have been carried out with an in-house solver using the Baldwin -Lomax turbulence model to identify the changes in secondary flow structures. The code has been validated for this application using test data from a low-speed axial turbine stage with a simple generic rotor shroud labyrinth seal. Numerical simulations are carried out with different clearance gaps (0, 1, and 3 mm) and without cavity wells. The simulations are used to distinguish the separate interactions of the main flow with the leakage flow and the cavity flow. The leakage flow causes a strong increase in the secondary flow kinetic energy in the downstream stator. Both the leakage flow and the cavity flow lead to an increase in the secondary kinetic energy in the rotor.

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