A method of diagnosing labyrinth seals in fluid-flow machines

Krzyślak, Piotr; Winowiecki, M.

doi:10.2478/v10012-007-0081-2

Cited by 6 publications

(3 citation statements)

References 1 publication

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“…Location of steam extraction and pressure measurement channels is to be so optimized as to ensure, on the basis of thermodynamic and fluid mechanic relationships, maximum possible accuracy and sensitivity of diagnostic apparature. Role of extraction channels is more thoroughly described in the publication [3].…”

Section: Description Of Packingmentioning

confidence: 99%

Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines

Kaszowski¹,

Dzida²,

Krzyślak³

2013

Polish Maritime Research

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Section: Description Of Packingmentioning

confidence: 99%

Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines

Kaszowski¹,

Dzida²,

Krzyślak³

2013

Polish Maritime Research

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“…Labyrinth seals have particular impact on the efficiency of high powergenerating machines. In the paper [1], the impact of the leakage in the internal gland of the steam turbine 13K215 on the power loss was analyzed. It was showed that the power loss resulting from the steam leakage through the internal seal of nominal geometry had achieved approx.…”

Section: Introductionmentioning

confidence: 99%

Novel Method of the Seal Aerodynamic Design to Reduce Leakage by Matching the Seal Geometry to Flow Conditions

Joachimiak

2021

Energies

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This paper presents a novel method of labyrinth seals design. This method is based on CFD calculations and consists in the analysis of the phenomenon of gas kinetic energy carry-over in the seal chambers between clearances. The design method is presented in two variants. The first variant is designed for seals for which it is impossible to change their external dimensions (length and height). The second variant enables designing the seal geometry without changing the seal length and with a slight change of the seal height. Apart from the optimal distribution of teeth, this variant provides for adjusting chambers geometry to flow conditions. As the result of using both variants such design of the seal geometry with respect to leakage is obtained which enables achieving kinetic energy dissipation as uniform as possible in each chamber of the seal. The method was developed based on numerical calculations and the analysis of the flow phenomena. Calculation examples included in this paper show that the obtained reduction of leakage for the first variant ranges from 3.4% to 15.5%, when compared with the initial geometry. The relation between the number of seal teeth and the leakage rate is also analyzed here. The second variant allows for reduction of leakage rate by 15.4%, when compared with the geometry with the same number of teeth. It is shown that the newly designed geometry reveals almost stable relative reduction of leakage rate irrespective of the pressure ratio upstream and downstream the seal. The efficiency of the used method is proved for various heights of the seal clearance.

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“…When the service life of the turbine comes to an end (overhaul interval) and the turbine is dismantled, the average height of the gap increases to 1.95 mm [17], as a result of significant wear of seals taking place during turbine operation between overhauls. This effect has a great influence on the thermal turbine efficiency [8]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research and CFD Calculations Based Investigations Into Gas Flow in a Short Segment of a Heavily Worn Straight Through Labyrinth Seal

Joachimiak

Krzyślak

2017

Polish Maritime Research

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A method of diagnosing labyrinth seals in fluid-flow machines

Abstract: ABSTRACT

Cited by 6 publications

References 1 publication

Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines

Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines

Novel Method of the Seal Aerodynamic Design to Reduce Leakage by Matching the Seal Geometry to Flow Conditions

Experimental Research and CFD Calculations Based Investigations Into Gas Flow in a Short Segment of a Heavily Worn Straight Through Labyrinth Seal

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