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Aerospace
Special Issues
Secondary Air Systems in Gas Turbine Engines II
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Secondary Air Systems in Gas Turbine Engines II

A special issue of Aerospace (ISSN 2226-4310). This special issue belongs to the section "Aeronautics".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 6502

Special Issue Editor

Dr. Erinc Erdem

E-Mail Website
Guest Editor
1. School of Engineering, University of Glasgow, Glasgow G12 8QQ, Scotland, UK
2. TUSAS Engine Industries (TEI), Eskisehir, Turkey
Interests: aerothermal analysis; turbomachinery; modeling and simulation; ground testing; measurement techniques; propulsion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

After a successful first Special Issue, this second Special Issue invites papers that address the areas of SAS in gas turbine engines encompassing aviation, power generation, and industrial applications. Secondary air systems (SAS) play a significant role in gas turbine engines to accomplish ensure reliable operation of the whole engine. The main functions of SAS are to provide a cooling flow to engine components, to seal bearing chambers (sumps) and turbine cavities, and finally to control bearing axial loads. Being a functional discipline, SAS owns the airflow that is not the primary flow path, essentially.

Traditionally, the design of secondary air systems utilized industrially friendly “one-dimensional modeling” for both compressible internal rotating/non-rotating fluid flow and heat transfer. Many correlations were developed to model/compute the flows with reasonable accuracy, taking into account heat pickups on the way in flow circuits.

The second issue addresses novel approaches in flow network modeling, contemporary modeling, and experimental efforts in rotor–stator/rotor–rotor cavities, windage measurements and predictions, advanced flow network modeling to include transient behaviors, advanced sealing technologies, axial load control strategies, rim sealing developments, and sump pressurization aspects.

Dr. Erinc Erdem
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Aerospace is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • gas turbine engines
  • secondary air systems
  • gas turbine sealing technologies
  • one-dimensional flow network modeling
  • rotor–stator/rotor–rotor cavities
  • compressible internal flows
  • heat transfer
  • gas turbine engine testing

Published Papers (2 papers)

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Research

14 pages, 4280 KiB  
Article
Coupled Fluid–Solid Numerical Simulation for Flow Field Characteristics and Supporting Performance of Flexible Support Cylindrical Gas Film Seal
by Junfeng Sun, Meihong Liu, Zhen Xu, Taohong Liao, Xiangping Hu, Yuxian Li and Juan Wang
Aerospace 2021, 8(4), 97; https://0-doi-org.brum.beds.ac.uk/10.3390/aerospace8040097 - 02 Apr 2021
Cited by 6 | Viewed by 2233
Abstract
A new type of cylindrical gas film seal (CGFS) with a flexible support is proposed according to the working characteristics of the fluid dynamic seal in high-rotational-speed fluid machinery, such as aero-engines and centrifuges. Compared with the CGFS without a flexible support, the [...] Read more.
A new type of cylindrical gas film seal (CGFS) with a flexible support is proposed according to the working characteristics of the fluid dynamic seal in high-rotational-speed fluid machinery, such as aero-engines and centrifuges. Compared with the CGFS without a flexible support, the CGFS with flexible support presents stronger radial floating characteristics since it absorbs vibration and reduces thermal deformation of the rotor system. Combined with the structural characteristics of a film seal, an analytical model of CGFS with a flexible wave foil is established. Based on the fluid-structure coupling analysis method, the three-dimensional flow field of a straight-groove CGFS model is simulated to study the effects of operating and structural parameters on the steady-state characteristics and the effects of gas film thickness, eccentricity, and the number of wave foils on the equivalent stress of the flexible support. Simulation results show that the film stiffness increases significantly when the depth of groove increases. When the gas film thickness increases, the average equivalent stress of the flexible support first decreases and then stabilizes. Furthermore, the number of wave foils affects the average foils thickness. Therefore, when selecting the number of wave foils, the support stiffness and buffer capacity should be considered simultaneously. Full article
(This article belongs to the Special Issue Secondary Air Systems in Gas Turbine Engines II)
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16 pages, 31062 KiB  
Article
Numerical Analysis of Flow across Brush Elements Based on a 2-D Staggered Tube Banks Model
by Xiaolei Song, Meihong Liu, Xiangping Hu, Xueliang Wang, Taohong Liao and Junfeng Sun
Aerospace 2021, 8(1), 19; https://0-doi-org.brum.beds.ac.uk/10.3390/aerospace8010019 - 15 Jan 2021
Cited by 5 | Viewed by 2377
Abstract
In order to improve efficiency in turbomachinery, brush seal replaces labyrinth seals widely in the secondary air system. A 2-d staggered tube bank model is adopted to simulate the gas states and the pressure character in brush seal, and computational fluid dynamics (CFD) [...] Read more.
In order to improve efficiency in turbomachinery, brush seal replaces labyrinth seals widely in the secondary air system. A 2-d staggered tube bank model is adopted to simulate the gas states and the pressure character in brush seal, and computational fluid dynamics (CFD) is used to solve the model in this paper. According to the simulation results, the corrected formula of the Euler number and dimensionless pressure are given. The results show that gas expands when flow through the bristle pack, and the gas expansion closes to an isotherm process. The dynamic pressure increases with decreasing static pressure. The Euler number can reflect the seal performance of brush seals in leakage characteristics. Compared with increasing the number of rows, the reduction of the gap is a higher-efficiency method to increase the Euler number. The Euler number continually increases as the gap decreases. However, with the differential pressure increasing, Euler number first increases and then decreases as the number of rows increases. Finally, the pressure distribution on the surface of end rows is asymmetric, and it may increase the friction between the bristles and the back plate. Full article
(This article belongs to the Special Issue Secondary Air Systems in Gas Turbine Engines II)
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