Measurement and simulation of the dynamic characteristics of plain and profiled annular seals

Kuhr, Maximilian M. G.; Ludwig, G.; Pelz, Peter F.

doi:10.1088/1755-1315/774/1/012073

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…For further validation purpose and experimental investigation of the induced forces on the rotor, a worldwide unique test rig is designed. Additional information on the test rig can be found in the work of Kuhr et al [42,43]. Figure 5 The test bench essentially consists of two magnetic bearings supporting the rotor.…”

Section: The Experimental Setupmentioning

confidence: 99%

Static Force Characteristic of Annular Gaps – Experimental and Simulation Results

Kuhr

Lang

Pelz

2022

Journal of Tribology

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We discuss the static characteristics, i.e the induced force on the rotor, the attitude angle and the pressure difference, of off-centred annular gaps with an axial flow component without cavitation. The paper focuses on turbulent flow inside the annulus. Instead of modelling the inertia effects using the bulk-flow approach, the presented model uses an integro-differential approach in combination with power law ansatz functions for the velocity profiles and a Hirs' model to calculate the resulting pressure field. For an experimental validation of the model and comparison to the bulk-flow approach, an annular gap test rig is presented using magnetic bearings to inherently measure the position as well as the force on the rotor induced by the flow field inside the gap. The experimental investigations are performed using three different annuli with three different lengths. The impact of a variation of a modified Reynolds number, the flow number and the pre-swirl ration on the resulting force on the rotor, the attitude angle and the pressure difference across the annulus is investigated and compared to the presented model and the bulk-flow approach.

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Section: The Experimental Setupmentioning

confidence: 99%

Static Force Characteristic of Annular Gaps – Experimental and Simulation Results

Kuhr

Lang

Pelz

2022

Journal of Tribology

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“…For validation purpose and experimental investigation of the induced forces on the rotor, a world wide unique test rig is designed. Additional information on the test rig can be found in the work of Kuhr et al (2019Kuhr et al ( , 2021. Figure 4 shows the annular gap flow test bench at the laboratory of the Chair of Fluid Systems at the Technische Universität Darmstadt.…”

Section: The Experimental Setupmentioning

confidence: 99%

Static force characteristic of annular gaps -- Experimental and simulation results

Kuhr,

Lang,

Pelz

2021

Preprint

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We discuss the static force characteristic of annular gaps resulting from an axial flow component. So far there is a severe lack of understanding of the flow inside the annulus. First, the state-of-theart modelling approaches to describe the flow inside the annulus are recapped and discussed. The discussion focuses in particular on the modelling of inertia effects. Second, a new calculation method, the Clearance-Averaged Pressure Model (CAPM) is presented. The CAPM uses an integro-differential approach in combination with power law ansatz functions for the velocity profiles and a Hirs' model to calculate the resulting pressure field. Third, for experimental validation, a setup is presented using magnetic bearings to inherently measure the position as well as the force on the rotor induced by the flow field inside the gap. The experiments focus on the characteristic load behaviour, attitude angle and pressure difference across the annulus. Fourth, the experimental results are compared to the calculation results.

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Evaluation of the flow state and static performance of smooth annular liquid seals

Yang¹,

Feng²,

Wan³

et al. 2023

J. vibroeng.

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The static fluid-induced force and stiffness coefficient of the smooth annular seal directly affect the rotor system stability. In this paper, a computational ﬂuid dynamics method is applied to investigate the ﬂow characteristics of a smooth annular seal for various eccentricities, discharge/supply pressures and rotational speeds under different flow conditions (laminar, transition, and turbulent flow). The influence factors and formation mechanism of the static instability in the smooth annular liquid seal are analyzed. Results show that laminar flow dominates the flow state at a rotational speed of ω= 2000 rpm. As the rotational speeds increase, the transition flow (2000-7000 rpm) gradually transits to the turbulent regime (ω> 7000 rpm). The direct static stiffness decreases first and then increases from laminar to transition flow state, and the viscosity effect is the dominant factor. For transition and turbulent flow with high eccentricities (ε= 80 %), the dominant viscous effect and inertial effect lead to the negative radial force and negative direct static stiffness coefficients. The smooth annular liquid seal shows best performance in the laminar flow and worst performance in the turbulent flow.

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Measurement and simulation of the dynamic characteristics of plain and profiled annular seals

Cited by 3 publications

References 11 publications

Static Force Characteristic of Annular Gaps – Experimental and Simulation Results

Static Force Characteristic of Annular Gaps – Experimental and Simulation Results

Static force characteristic of annular gaps -- Experimental and simulation results

Evaluation of the flow state and static performance of smooth annular liquid seals

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