Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine

Advanced brush seal technology has a significant impact on the performance and efficiency of gas turbine engines. However, in highly inlet swirling environments, the bristles of a brush seal tend to circumferentially slip, which may lead to aerodynamic instability and seal failure. In this paper, se...

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Autores principales:	Yuxin Liu, Benzhuang Yue, Xiaozhi Kong, Hua Chen, Huawei Lu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	brush seal front plate inlet swirl circumferential slip aerodynamic instability Technology T
Acceso en línea:	https://doaj.org/article/27669b09f53d4e0bba4b2f69adde68cb
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id	oai:doaj.org-article:27669b09f53d4e0bba4b2f69adde68cb
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spelling	oai:doaj.org-article:27669b09f53d4e0bba4b2f69adde68cb2021-11-25T17:28:39ZEffects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine10.3390/en142277681996-1073https://doaj.org/article/27669b09f53d4e0bba4b2f69adde68cb2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7768https://doaj.org/toc/1996-1073Advanced brush seal technology has a significant impact on the performance and efficiency of gas turbine engines. However, in highly inlet swirling environments, the bristles of a brush seal tend to circumferentially slip, which may lead to aerodynamic instability and seal failure. In this paper, seven different front plate geometries were proposed to reduce the impact of high inlet swirl on the bristle pack, and a three-dimensional porous medium model was carried out to simulate the brush seal flow characteristics. Comparisons of a plane front plate with a relief cavity, plane front plate with axial drilled holes, anti-“L”-type plate and their relative improved configurations on the pressure and flow fields as well as the leakage behavior were conducted. The results show that the holed front plate can effectively regulate and control the upstream flow pattern of the bristle pack, inducing the swirl flow to move radially inward, which results in decreased circumferential velocity component. The anti-“L” plate with both axial holes and one radial hole was observed to have the best effect on reducing the swirl of those investigated. The swirl velocity upstream the bristle pack can decline 50% compared to the baseline model with plane front plate, and the circumferential aerodynamic forces on the bristles, which scale with the swirl dynamic head, are reduced by a factor of 4. This could increase the bristle stability dramatically. Moreover, the front plate geometry does not influence the leakage performance significantly, and the application of the axial hole on the front plate will increase the leakage slightly by around 3.5%.Yuxin LiuBenzhuang YueXiaozhi KongHua ChenHuawei LuMDPI AGarticlebrush sealfront plateinlet swirlcircumferential slipaerodynamic instabilityTechnologyTENEnergies, Vol 14, Iss 7768, p 7768 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	brush seal front plate inlet swirl circumferential slip aerodynamic instability Technology T
spellingShingle	brush seal front plate inlet swirl circumferential slip aerodynamic instability Technology T Yuxin Liu Benzhuang Yue Xiaozhi Kong Hua Chen Huawei Lu Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
description	Advanced brush seal technology has a significant impact on the performance and efficiency of gas turbine engines. However, in highly inlet swirling environments, the bristles of a brush seal tend to circumferentially slip, which may lead to aerodynamic instability and seal failure. In this paper, seven different front plate geometries were proposed to reduce the impact of high inlet swirl on the bristle pack, and a three-dimensional porous medium model was carried out to simulate the brush seal flow characteristics. Comparisons of a plane front plate with a relief cavity, plane front plate with axial drilled holes, anti-“L”-type plate and their relative improved configurations on the pressure and flow fields as well as the leakage behavior were conducted. The results show that the holed front plate can effectively regulate and control the upstream flow pattern of the bristle pack, inducing the swirl flow to move radially inward, which results in decreased circumferential velocity component. The anti-“L” plate with both axial holes and one radial hole was observed to have the best effect on reducing the swirl of those investigated. The swirl velocity upstream the bristle pack can decline 50% compared to the baseline model with plane front plate, and the circumferential aerodynamic forces on the bristles, which scale with the swirl dynamic head, are reduced by a factor of 4. This could increase the bristle stability dramatically. Moreover, the front plate geometry does not influence the leakage performance significantly, and the application of the axial hole on the front plate will increase the leakage slightly by around 3.5%.
format	article
author	Yuxin Liu Benzhuang Yue Xiaozhi Kong Hua Chen Huawei Lu
author_facet	Yuxin Liu Benzhuang Yue Xiaozhi Kong Hua Chen Huawei Lu
author_sort	Yuxin Liu
title	Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
title_short	Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
title_full	Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
title_fullStr	Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
title_full_unstemmed	Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine
title_sort	effects of front plate geometry on brush seal in highly swirling environments of gas turbine
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/27669b09f53d4e0bba4b2f69adde68cb
work_keys_str_mv	AT yuxinliu effectsoffrontplategeometryonbrushsealinhighlyswirlingenvironmentsofgasturbine AT benzhuangyue effectsoffrontplategeometryonbrushsealinhighlyswirlingenvironmentsofgasturbine AT xiaozhikong effectsoffrontplategeometryonbrushsealinhighlyswirlingenvironmentsofgasturbine AT huachen effectsoffrontplategeometryonbrushsealinhighlyswirlingenvironmentsofgasturbine AT huaweilu effectsoffrontplategeometryonbrushsealinhighlyswirlingenvironmentsofgasturbine
_version_	1718412273770299392

Effects of Front Plate Geometry on Brush Seal in Highly Swirling Environments of Gas Turbine

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