Interaction of Labyrinth Seal Leakage Flow and Main Flow in an Axial Turbine

Giboni, A.; Menter, J. R.; Peters, Patrick; Wolter, Klaus‐Jürgen; Pfost, H.; Breisig, Volker

doi:10.1115/gt2003-38722

Cited by 13 publications

(5 citation statements)

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“…The loss centre due to the tip leakage from the upstream rotor moves together with the recirculating flow towards the suction surface and deep towards mid-span sections. The increase in size and intensity of the tip passage vortex in the next stator due to the influence of the tip leakage flow was also observed in some experimental works [24,25].…”

Section: The Effect Of Leakage Flow (The Case Of Shrouded Blades)supporting

confidence: 53%

A Deep Insight to Secondary Flows

Ilieva¹

2017

DDF

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Flow through turbine stages is three-dimensional and highly complex due to secondary flows, axial and tip clearances, 3D blades, rotational effects, varying fluid properties, turbulence effects, boundary layer development, etc. Secondary flows presence in turbines is identified as one of the main reason for losses and less efficiency performance. Hence in turbines, the need for understanding of secondary flows mechanisms and application of methods for their reduction is significant. This study is targeted to the discussion of secondary flows, аs follows: analysis of reasons for their development in turbine stages; influence on flow parameters distribution, efficiency of energy conversion and the overall aerodynamic performance of the turbo aggregate and ways to reduce their presence in the flow structure. As a result of the fulfilled intensive research works, a methodology for numerical modeling and mechanisms identification of secondary flows, through turbine channels, is attained also. Flow structures, specifics in aerodynamics, flow parameters distribution; interaction effects among vortices, core flow, endwalls and tip leaks, and many other flow features are discussed. An innovative approach to overcome reasons for secondary flows to appear and how to increase efficiency, have been studied and discussed.

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Section: The Effect Of Leakage Flow (The Case Of Shrouded Blades)supporting

confidence: 53%

A Deep Insight to Secondary Flows

Ilieva¹

2017

DDF

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“…Some of the earlier results have been presented in several publications, e.g. Peters et al [14], Giboni et al [15], and Anker and Mayer [16].…”

Section: Introductionmentioning

confidence: 78%

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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“…Thus, combining simulate and experiment to analyze the characteristics of leakage flow inside turbocharger chamber becomes a critical technical way to guide the sealing structure design. The study of flow characteristics between leakage flow and main flow conducted by Giboni et al indicated that the leakage flow deteriorated the flow field in turbine, resulting in the unstable operation of turbine [15]. It is necessary to seriously take into account the leakage flow in the design or optimization of turbomachinery.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Sealing Performance and Power Consumption of a Novel Centrifugal Pump Type Oil Flinger for Turbocharger

et al. 2021

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Energy efficient conversion and saving technologies have increasingly become areas of fierce competition among countries all over the world. As a vehicle power multiplier, the turbocharger advances the power output of the engine, but also increases the power consumption due to oil leakage, which aggravates the fuel energy consumption. This work aims to investigate the sealing performance and power consumption of the proposed novel centrifugal pump type oil flinger (CPTOF) to suppress the oil leakage and reduce the power consumption of turbocharger, thereby saving fuel energy. First, the flow characteristics of CPTOF and traditional oil flinger were compared based on the established oil-air flow numerical model. Then, the effects of oil slinging hole number Z, diameter dh and inclination angle α on pumping air performance and power consumption of CPTOF were analyzed. Finally, the structural parameters of CPTOF were optimized using the orthogonal table L9(3 4 ) and the results were verified through experiment. Results showed that the oil leakage of sealing structure was effectively prevented by the pumping air effect. Moreover, Z, α and dh also had significantly effects on the sealing performance and the power consumption, and the degree of influence raised in turn. The CPTOF with Z=16, dh=1.80 mm and α=0° had the optimum working efficiency, resulting in the average pressure drop being extended to 107 kPa and the power consumption being reduced by 33.05%.INDEX TERMS Centrifugal pump type oil flinger, turbocharger, pumping air effect, power consumption.

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Interaction of Labyrinth Seal Leakage Flow and Main Flow in an Axial Turbine

Cited by 13 publications

References 0 publications

A Deep Insight to Secondary Flows

A Deep Insight to Secondary Flows

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

Investigation on Sealing Performance and Power Consumption of a Novel Centrifugal Pump Type Oil Flinger for Turbocharger

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