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Kang, Yachi
Publications (5 of 5) Show all publications
Kang, Y., Liu, M., Hu, X. & Liu, J. (2019). Investigation into velocity choice for determining aerodynamic resistance in brush seals. In: Lecture Notes in Electrical Engineering: . Paper presented at 8th International Workshop of Advanced Manufacturing and Automation, IWAMA 2018; Changzhou; China; 25 September 2018 through 26 September 2018 (pp. 616-622). Springer Verlag, 484
Open this publication in new window or tab >>Investigation into velocity choice for determining aerodynamic resistance in brush seals
2019 (English)In: Lecture Notes in Electrical Engineering, Springer Verlag , 2019, Vol. 484, p. 616-622Conference paper, Published paper (Refereed)
Abstract [en]

Brush seal is a novel contact seal in turbomachinery. Although this new type of seal has been adopted for many years, there are still some problems which should be investigated. One of the main problems is the determined pressure differential across a brush seal. Aerodynamic resistance, characterized by Euler number (Eu), is used to determine pressure differential of brush seals. Eu is a dimensionless quantity including a velocity term. Tube banks model is widely used in numerical simulation of brush seals. Various velocity values can be chosen by calculating Eu in a tube banks model. The present research analyzed the effect of different velocity values on Eu. Velocity choice in a tube banks model was preliminarily analyzed. Three different methods (Eu1, Eu2 and Eu3) for calculating Eu were presented. The results revealed that Eu1 decreases as the pressure differential increasing. Eu2 keeps almost unchanged or increase slightly with the growing of pressure differential, as well as Eu3. By comparing Eu1, Eu2 and Eu3 and considering practical application, Eu1 is qualified for measuring the aerodynamic resistance. © Springer Nature Singapore Pte Ltd 2019.

Place, publisher, year, edition, pages
Springer Verlag, 2019
Keywords
Aerodynamic resistance, Brush seal, Tube banks model, Velocity distribution, Aerodynamic loads, Aerodynamics, Manufacture, Velocity, Contact seals, Euler numbers, Pressure differential, Tube banks, Seals
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-17472 (URN)10.1007/978-981-13-2375-1_77 (DOI)2-s2.0-85059105026 (Scopus ID)9789811323744 (ISBN)
Conference
8th International Workshop of Advanced Manufacturing and Automation, IWAMA 2018; Changzhou; China; 25 September 2018 through 26 September 2018
Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-16Bibliographically approved
Kang, Y., Liu, M., Kao-Walter, S., Liu, J. & Cen, Q. (2019). Numerical Analysis of Pressure Distribution in a Brush Seal Based on a 2-D Staggered Tube Banks Model. Intelligent Automation and Soft Computing, 25(2), 405-411
Open this publication in new window or tab >>Numerical Analysis of Pressure Distribution in a Brush Seal Based on a 2-D Staggered Tube Banks Model
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2019 (English)In: Intelligent Automation and Soft Computing, ISSN 1079-8587, E-ISSN 2326-005X, Vol. 25, no 2, p. 405-411Article in journal (Refereed) Published
Abstract [en]

A two-dimensional model of staggered tube banks of the bristle pack with different pitch ratios was solved by computational fluid dynamics (CFD). The pressure distribution along the gap centerlines and bristle surfaces were studied for different upstream pressure from 0.2 to 0.6MPa and models. The results show that the pressure is exponentially rather than strictly linearly decreasing distributed inside the bristle pack. The pressure distribution is symmetry about the circle's horizontal line. The most obvious pressure drop occurred from about 60 degrees to 90 degrees. There is no stationary state reached between the kinetic energy and the static pressure when the upstream is larger than 0.3MPa.

Place, publisher, year, edition, pages
TSI PRESS, 2019
Keywords
Brush seal, Computational Fluid Dynamics (CFD), Pressure distribution, Staggered tube banks
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:bth-18608 (URN)10.31209/2019.100000102 (DOI)000475551300019 ()
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-11-14Bibliographically approved
Liu, J., Liu, M., Kang, Y. & Tan, Y. (2019). Numerical simulation of the flow field characteristic in a two-dimensional brush seal model. In: Wang K.,Strandhagen J.O.,Wang Y.,Yu T. (Ed.), Lecture Notes in Electrical Engineering: . Paper presented at 8th International Workshop of Advanced Manufacturing and Automation, IWAMA 2018; Changzhou; China; 25 September 2018 through 26 September 2018 (pp. 636-642). Springer Verlag, 484
Open this publication in new window or tab >>Numerical simulation of the flow field characteristic in a two-dimensional brush seal model
2019 (English)In: Lecture Notes in Electrical Engineering / [ed] Wang K.,Strandhagen J.O.,Wang Y.,Yu T., Springer Verlag , 2019, Vol. 484, p. 636-642Conference paper, Published paper (Refereed)
Abstract [en]

The numerical model was established using the two-dimensional cross section of staggered tube bundle of bristles, and the flow field was numerically solved by Fluent. This work presents velocity of flow and the variation range of flow velocity under transient state at the-last bristles gap are much higher than those of the front row, which leads to severe wear of the last row of bristles; as the bristle row number increases, the leakage decreases rapidly, then decreases slowly; the leakage increases linearly with the increase of the pressure difference; the brush drag force slowly increases along the axial direction but increases significantly at the last row; the drag force increases linearly with differential pressure increasing. © Springer Nature Singapore Pte Ltd 2019.

Place, publisher, year, edition, pages
Springer Verlag, 2019
Keywords
Brush seal, Flow field characteristic, Numerical simulate, Staggered tube bundle, Drag, Flow fields, Flow velocity, High pressure effects, Manufacture, Numerical models, Differential pressures, Flow field characteristics, Pressure differences, Transient state, Tube Bundle, Two-dimensional cross sections, Seals
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-17470 (URN)10.1007/978-981-13-2375-1_80 (DOI)2-s2.0-85059073883 (Scopus ID)9789811323744 (ISBN)
Conference
8th International Workshop of Advanced Manufacturing and Automation, IWAMA 2018; Changzhou; China; 25 September 2018 through 26 September 2018
Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-01-16Bibliographically approved
Kang, Y., Liu, M., Wang, X., Tan, Y. & Liu, J. (2018). Numerical simulation of pressure distribution in bristle seal for turbomachinery. Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering, 36(5), 420-425
Open this publication in new window or tab >>Numerical simulation of pressure distribution in bristle seal for turbomachinery
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2018 (Chinese)In: Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering, ISSN 1674-8530, Vol. 36, no 5, p. 420-425Article in journal (Refereed) Published
Abstract [en]

In order to further study the pressure distribution in bristle seals, a uniformed two-dimensional closed staggered tube bundle model representing a bristle pack cross-section was proposed and the fluid flow through the bundle was solved by computational fluid dynamics(CFD) method. Accor-ding to the critical Reynolds number for boundary layer transition, a new method was proposed to decide the fluid flow regime in the bundle. The pressure and velocity distributions in the bundle were studied under various pressure differentials across the seal. The influences of distance between bristles and number of circumferential bristle rows on the pressure distribution were tackled. It is shown that the pressure distributions in the uniformed two-dimensional closed staggered tube bundle model agree well with the previous experimental data. The pressure distributions are like "V", while the velocity distributions are like the inverted "V". The pressure borne by the rear 1/3 part of the bristle pack is higher than that by the front 2/3 part. Moreover, the percentage of the pressure differential borne by the last 5 bristle rows increases with increasing total pressure differential. The pressure differential borne by the last bristle row is higher than that by a few rows in front of it. A reduced distance between bristles can allow the pressure to be distributed more even from one row to another. Bristles equally spaced can ensure an even pressure distribution rather well. Increasing the number of rows can also have the same effect. © 2018, Editorial Department of Journal of Drainage and Irrigation Machinery Engineering. All right reserved.

Place, publisher, year, edition, pages
Editorial Department of Journal of Drainage and Irrigation Machinery Engineering, 2018
Keywords
Boundary layer flow, Brush seal, Computational fluid dynamics, Pressure distribution, Staggered tube bundle
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-17592 (URN)10.3969/j.issn.1674-8530.16.0212 (DOI)
Available from: 2019-02-11 Created: 2019-02-11 Last updated: 2019-02-11Bibliographically approved
Kang, Y., Liu, M., Kao-Walter, S., Reheman, W. & Liu, J. (2018). Predicting aerodynamic resistance of brush seals using computational fluid dynamics and a 2-D tube banks model. Tribology International, 126, 9-15
Open this publication in new window or tab >>Predicting aerodynamic resistance of brush seals using computational fluid dynamics and a 2-D tube banks model
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2018 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 126, p. 9-15Article in journal (Refereed) Published
Abstract [en]

Aerodynamic resistance of a brush seal was mainly studied. The velocity distribution along three specified lines was presented. By considering the pressure differential, Reynolds number and Euler number (Eu) were modified. The effect of geometric arrangements and pressure differentials on Eu and leakage were analyzed. Two correlations were fitted based on the numerical results. The results reveal the velocity distribution is almost flat, asymmetric along the specified lines. The velocity increases and decreases almost linearly at centerlines. Eu decreases gradually less with the increase of pressure differential and trends towards a fixed value. A larger Eu indicates stronger resistance but not necessarily less leakage. Finally, two fitted correlations are developed and one is exponential to the row number fits better. © 2018 Elsevier Ltd

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Aerodynamic resistance, Brush seal, Euler number, Reynolds number
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-16219 (URN)10.1016/j.triboint.2018.04.023 (DOI)000437075900002 ()2-s2.0-85046798940 (Scopus ID)
Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-08-21Bibliographically approved
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