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Fluid Machinery, Systems and Storage Technologies for Clean and Sustainable Energy Generation in 2021

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "A: Sustainable Energy".

Deadline for manuscript submissions: closed (10 October 2021) | Viewed by 4575
Submit your paper and select the Journal “Energies” and the Special Issue “Fluid Machinery, Systems and Storage Technologies for Clean and Sustainable Energy Generation in 2021” via: https://susy.mdpi.com/user/manuscripts/upload?journal=energies. Please contact the guest editor or the journal editor ([email protected]) for any queries.

Special Issue Editors


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Guest Editor
Department of Mechanics, Mathematics and Management, Politecnico di Bari, via Orabona 4, 70126 Bari BA, Italy
Interests: systems for energy generation and heat exchange: with studies on wind turbines, combined cycles employing externally fired gas turbines and Rankine cycles using water and organic fluids; design optimization of combined cycle power plants and thermos-economic analyses by using genetic algorithms; construction of a small-scale combined-cycle prototype for energy generation from solid biomass and biogas; innovative immersed particle heat exchangers for heat recovery; development of an innovative open field wind tunnel for the testing of micro wind turbines; design of a novel heat exchanger employing solid alumina particles as a heat transfer medium, with the aim of realizing externally fired gas turbines
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Guest Editor
Department of Mechanics, Mathematics and Management, Politecnico di Bari, via Orabona 4, 70126 Bari BA, Italy
Interests: hydraulic and thermal machines; fluid dynamics; the design of numerical methods for compressible and incompressible flows; stability analysis of shear flows; turbulence and transition modeling; combustion modelling; numerical analysis of complex flow in turbomachinery; energy systems
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mechanics, Mathematics and Management, Politecnico di Bari, via Orabona 4, 70126 Bari, BA, Italy
Interests: servo-valves; proportional valves; piezo-electric actuators; aircraft fuel systems; hydrogen for aircraft; internal combustion engines; heat exchangers; small-scale combined-cycles; biomethane liquefa
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Mechanics, Mathematics and Management, Politecnico di Bari, via Orabona 4, 70126 Bari BA, Italy
Interests: the pollutant emission processes deriving from combustion sources; the employment of 3D CFD simulations—involving detailed chemistry-based models as well as accurate heat-exchange and flame-propagation sub-models—coupled with extended experimental campaigns; the analysis and design of energy-generation and heat-exchange systems; the experimental and numerical analysis of multi-phase flows with applications in the design of proportional valves
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Special Issue Information

Dear Colleagues,

The articles in this Issue will be concerned with one of the most important sectors of the global economy: the production of energy for humanity. Energy production, efficiency, storage, and transportation have been topics of interest since the steam age, since they correspond to the power of nations. At present, with the increasing global emphasis on emissions reduction, global warming, and energy security and sustainability, these subjects have never been more important.

The submission deadline is 30 August 2020. You may send your manuscript at any point from now until the deadline. Submitted papers should not be under consideration for publication elsewhere.

Prof. Dr. Riccardo Amirante
Prof. Dr. Pietro De Palma
Dr. Paolo Tamburrano
Dr. Elia Distaso
Guest Editors

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. Energies 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 2600 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

  • renewables 
  • storage systems 
  • generation and smart grids 
  • fluid machinery 
  • power architectures 
  • energy conversion
  • low-carbon technologies 
  • solar energy 
  • clean internal combustion engines

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Published Papers (2 papers)

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Research

16 pages, 7321 KiB  
Article
Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters
by Fatong Jia, Dazhang Yang and Jing Xie
Energies 2021, 14(21), 6900; https://doi.org/10.3390/en14216900 - 21 Oct 2021
Cited by 11 | Viewed by 2105
Abstract
In this study, the effects of the mixing chamber diameter (Dm), mixing chamber length (Lm) and pre-mixing chamber converging angle (θpm) were numerically investigated for a two-throat nozzle ejector to be utilized in a [...] Read more.
In this study, the effects of the mixing chamber diameter (Dm), mixing chamber length (Lm) and pre-mixing chamber converging angle (θpm) were numerically investigated for a two-throat nozzle ejector to be utilized in a CO2 refrigeration cycle. The developed simulated method was validated by actual experimental data of a CO2 ejector in heat pump water heater system from the published literature. The main results revealed that the two-throat nozzle ejectors can obtain better performance with Dm in the range of 8–9 mm, Lm in the range of 64–82 mm and θpm at approximately 60°, respectively. Deviation from its optimal value could lead to a poor operational performance. Therefore, the mixing chamber structural parameters should be designed at the scope around its optimal value to guarantee the two-throat nozzle ejector performance. The following research can be developed around the two-throat nozzle geometries to strengthen the ejector performance. Full article
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20 pages, 10609 KiB  
Article
Influence of Clearance Flow on Dynamic Hydraulic Forces of Pump-Turbine during Runaway Transient Process
by Xiaoxia Hou, Yongguang Cheng, Zhiyan Yang, Ke Liu, Xiaoxi Zhang and Demin Liu
Energies 2021, 14(10), 2830; https://doi.org/10.3390/en14102830 - 14 May 2021
Cited by 16 | Viewed by 1831
Abstract
The clearance flow around the pump-turbine runner has significant influences on unit vibrations, which may cause accidents in transient processes. The dynamic hydraulic forces and flow patterns in the clearance flow channel (CFC) of a low specific-speed pump-turbine were analyzed based on 3D [...] Read more.
The clearance flow around the pump-turbine runner has significant influences on unit vibrations, which may cause accidents in transient processes. The dynamic hydraulic forces and flow patterns in the clearance flow channel (CFC) of a low specific-speed pump-turbine were analyzed based on 3D CFD simulations during the runaway oscillating process. It is shown that the axial force of the runner periodically fluctuates with large amplitudes, and its components in CFC and the main flow channel (MFC) demonstrate a similar significance level. The CFC component was formulated as a function of the clearance inlet pressure and rotational speed, while the MFC component as a function of the momentum changing rate and the runner outlet pressure force. The fluctuation of runner radial force is mainly caused by the flow evolution in MFC, however, the flow in CFC aggravates it. The pressure in CFC shows a few pulsating signals from MFC, and the radial pressure drop in CFC is proportional to the square of both radius and rotational speed. In CFC, strong rotating shear flow containing a velocity core region in the circumferential direction is formed, and rotational speed is the dominant factor. Full article
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