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Applied Sciences
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Advanced Technologies in Rotating Machinery: Design, Modeling, Manufacturing, Testing, and...
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Advanced Technologies in Rotating Machinery: Design, Modeling, Manufacturing, Testing, and Operation

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Robotics and Automation".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 1360

Special Issue Editor

Dr. Keun Ryu

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Hanyang University, Ansan 15588, Gyeonggi-do, Republic of Korea
Interests: turbomachinery rotordynamics; rotating machinery diagnostics and vibration; bearings, seals, and dampers for turbomachinery; advanced turbomachinery with Improved stability; cryogenic bearings for liquid rocket engine turbopumps; oil-free turbomachinery; rocket engine turbopumps; electrically assisted turbomachinery; automotive turbochargers; high-speed electric motors/generators; space tribology
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Rotating machinery or turbomachinery is a machine with a rotating component that transfers energy to a fluid or vice versa. Consequently, in a turbomachine, there is energy transfer between the fluid and the rotor through dynamic interaction.

The current Special Issue invites archival-quality papers focused on the broad topic of component and system technologies for rotating machinery. We hope to establish a collection of papers that will be of interest to scholars in the field. Contributions in the form of full papers, reviews, and communications about the related topics are very welcome.

Dr. Keun Ryu
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. Applied Sciences is an international peer-reviewed open access semimonthly 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

  • computational fluid dynamics (CFD) analysis
  • controls, diagnostics, instrumentation, and measurement techniques
  • heat transfer and thermal management
  • new propulsion and power systems
  • steam turbines
  • structures and dynamics
  • advanced gas turbine engines and cycles, and gas turbine hybrids
  • advanced manufacturing concepts for gas turbine engines
  • advances in exhaust technologies (diffusers, nozzles, and related systems)
  • combustors, fuel injectors, alternative fuels, emissions, fuel flexible combustion systems
  • engine controls, operability, and propulsion health management
  • high-fidelity simulations and validation experiments
  • high-speed low pressure turbines
  • multidisciplinary design, analysis/optimization of engine systems and components
  • thermal management, heat transfer and cooling, materials, and coatings
  • rotor dynamics
  • machine components in turbomachinery
  • aerodynamic design, analysis, and test of compressor and turbine blading
  • compressor stall and surge
  • aeromechanical instabilities

Published Papers (2 papers)

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Research

16 pages, 6835 KiB  
Article
Determining Steady-State Operation Criteria Using Transient Performance Modelling and Steady-State Diagnostics
by Konstantinos Mathioudakis, Nikolaos Aretakis and Alexios Alexiou
Appl. Sci. 2024, 14(7), 2863; https://doi.org/10.3390/app14072863 - 28 Mar 2024
Viewed by 596
Abstract
Data from the steady-state operation of gas turbine engines are used in gas path diagnostic procedures. A method to identify steady-state operation is thus required. This paper initially explains and demonstrates the factors that cause a deviation in engine health when transient data [...] Read more.
Data from the steady-state operation of gas turbine engines are used in gas path diagnostic procedures. A method to identify steady-state operation is thus required. This paper initially explains and demonstrates the factors that cause a deviation in engine health when transient data are used for diagnosis and shows that there is a threshold in the slope of time traces, below which the variation in engine health parameters is acceptable. A methodology for deriving a criterion for steady-state operation based on actual flight data is then presented. The slope of the exhaust gas temperature variation with time and the size of its time-series window, from which this slope is determined, are the required parameters that must be specified when applying this criterion. It is found that the values of these parameters must be selected so that a sufficient number of steady-state points are available without compromising the accuracy of the diagnostic procedure. Full article
(This article belongs to the Special Issue Advanced Technologies in Rotating Machinery: Design, Modeling, Manufacturing, Testing, and Operation)
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17 pages, 3930 KiB  
Article
Cost-Effective Design Modification of a Sleeve Bearing with Large Bearing Clearance
by Gudeta Berhanu Benti, Jan-Olov Aidanpää and Rolf Gustavsson
Appl. Sci. 2024, 14(3), 1214; https://doi.org/10.3390/app14031214 - 31 Jan 2024
Cited by 1 | Viewed by 539
Abstract
In 2015, a 45 MW vertical hydropower machine exhibited excessive vibration after refurbishment. Measurements revealed a substantial bearing clearance at the lower generator guide bearing. Consequently, the bearing was unable to generate sufficient opposing force to drive the rotor toward the bearing center, [...] Read more.
In 2015, a 45 MW vertical hydropower machine exhibited excessive vibration after refurbishment. Measurements revealed a substantial bearing clearance at the lower generator guide bearing. Consequently, the bearing was unable to generate sufficient opposing force to drive the rotor toward the bearing center, resulting in more pronounced overall system vibration. Addressing this challenge required a cost-effective and feasible solution for mitigating the vibration problem. To this end, a design modification was implemented wherein the lower generator guide bearing (originally a sleeve bearing) was modified to a four-lobe bearing by offsetting the two halves of the bearing twice in two axes. Numerical simulations and experimentations were conducted, and the dynamics of the machine before and after the design modification were investigated. Both the simulation and experimental results showed that the machine with the four-lobe bearing improved the system stability and reduced the vibration amplitudes. The numerical simulation result demonstrated that, due to the design modification, the first and second critical speeds were effectively eliminated for a speed range of up to three times the nominal speed. Furthermore, for nominal operation with unbalanced magnetic pull, the four-lobe bearing provided a stability advantage in terms of the modal parameters relative to the original sleeve bearing. Full article
(This article belongs to the Special Issue Advanced Technologies in Rotating Machinery: Design, Modeling, Manufacturing, Testing, and Operation)
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