Design Parameters of Brush Seals and Their Impact on Seal Performance

Schwarz, H.; Friedrichs, Jens; Flegler, Johan

doi:10.1115/gt2012-68956

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…For each investigation, 24 reproducible circumferential positions can be examined. The investigations are conducted using up to three different non-rotating disks with a diameter equivalent to the shafts diameter of the hot steam test rig, as described in detail in (Schwarz et al, 2012(Schwarz et al, , 2014. As depicted in Figure 2, an optical access allows the evaluations of the blow down and the axial behaviour.…”

Section: Cold-air Test Rigmentioning

confidence: 99%

Investigation of a Novel Pressure-Actuated Brush Seal Under Hot Steam Conditions

Reggentin

Friedrichs

Flegler

et al. 2020

J. Glob. Power Propuls. Soc.

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Due to the increasing demand towards flexible operation of conventional power plants also the seals of their turbines have to adapt to varying loads. Based on the basic design of a clamped brush seal, a novel seal with a pressure-actuated backplate is introduced which is capable of combining the advantages of low and high inclined brush seals while avoiding their undesired properties for flexible operation. During preliminary investigations on a test rig operated with compressed air and without rotation, the functionality of the improved design was demonstrated. It is shown that the leakage mass flow was lowered by up to 40% while undesired bristle oscillations were reduced by up to 90% at low pressure differences compared to conventional seal designs. After the adaption of the design for subsequent investigations under realistic conditions comparable to those in a steam turbine, further tests were conducted at TU Braunschweig's hot steam test rig. Within these investigations the novel design showed improved properties regarding a high leakage performance and an advanced capability to avoid deterioration due to shaft excursions compared to brush seals with fixed backplate design.

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Section: Cold-air Test Rigmentioning

confidence: 99%

Investigation of a Novel Pressure-Actuated Brush Seal Under Hot Steam Conditions

Reggentin

Friedrichs

Flegler

et al. 2020

J. Glob. Power Propuls. Soc.

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show abstract

“…Two major types of brush seals exist in the commercial brush seal industry, the clamped type, where the bristles are held with a clamping device, 24 and the welded type, wherein the bristles are connected via welding. Although the absence of the welding procedure gives some advantages, the clamping type introduces additional design complexity called axial inclination angle.…”

Section: Configuration Of the Brush Seal For Dynamic Characteristicsmentioning

confidence: 99%

Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

Byun

et al. 2020

Advances in Mechanical Engineering

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The exact understanding of the dynamic characteristic of the seal is a crucial parameter for designing the system. This article presents an experiment that estimates the dynamic characteristics of a brush seal under a super-heated steam environment for a steam turbine. The super-heated steam facility makes super-heated steam (523.15 K) to replicate the real steam turbine environment. Two brush seal units are utilized with a housing connected by springs to measure the modal parameters of the system. To extract the brush seal characteristics, the modal parameters of the pure housing were subtracted from the overall dynamic system. Moreover, to predict modal parameters more accurately, the least-squares method and the instrumental variable method were used to reduce the noise caused by the steam. Two major effects were experimentally investigated by varying the operating speed (0–16,900 r/min) of the rotor and the injection flow of super-heated steam. The results showed that the direct stiffness and damping of the brush seal increased significantly when the steam was injected. Under steam exposure, obtaining the modal parameters using instrumental variable method was confirmed to reduce more noise than obtaining the parameters via least-squares method.

show abstract

“…For each investigation, 24 reproducible circumferential positions can be examined. The investigations are conducted using up to three different nonrotating disks with a diameter equivalent to the shafts diameter of the hot steam test rig, as described in detail in (Schwarz et al, 2012;Schwarz et al,2014). As depicted in Fig.…”

Section: Cold-air Test Rigmentioning

confidence: 99%

Investigation of a Novel pressure-Actuated Brush Seal under Hot Steam Conditions

Reggentin¹,

Friedrichs²,

Flegler³

et al. 2019

Proceedings of Global Power &Amp; Propulsion Society

View full text Add to dashboard Cite

Due to the increasing demand towards flexible operation of conventional power plants also the seals of their turbines have to adapt to varying loads. Based on the basic design of a clamped brush seal, a novel seal with a pressure-actuated backplate is introduced which is capable of combining the advantages of low and high inclined brush seals while avoiding their undesired properties for flexible operation. During preliminary investigations on a test rig operated with compressed air and without rotation, the functionality of the improved design was demonstrated. It is shown that the leakage mass flow was lowered by up to 40% while undesired bristle oscillations were reduced by up to 90% at low pressure differences compared to conventional seal designs. After the adaption of the design for subsequent investigations under realistic conditions comparable to those in a steam turbine, further tests were conducted at TU Braunschweig´s hot steam test rig. Within these investigations the novel design showed improved properties regarding a high leakage performance and an advanced capability to avoid deterioration due to shaft excursions compared to brush seals with fixed backplate design.

show abstract

Design Parameters of Brush Seals and Their Impact on Seal Performance

Cited by 7 publications

References 1 publication

Investigation of a Novel Pressure-Actuated Brush Seal Under Hot Steam Conditions

Investigation of a Novel Pressure-Actuated Brush Seal Under Hot Steam Conditions

Estimation of the rotordynamic characteristics of a single brush seal using least-squares and instrumental variable methods under super-heated steam environment

Investigation of a Novel pressure-Actuated Brush Seal under Hot Steam Conditions

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