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Processes
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Advanced Design, Analysis and Optimization Techniques of Fluid Machinery Systems...
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Advanced Design, Analysis and Optimization Techniques of Fluid Machinery Systems for Renewable Energy Storage

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Energy Systems".

Deadline for manuscript submissions: 20 January 2025 | Viewed by 2653

Special Issue Editors

Prof. Dr. Ji Pei

E-Mail Website
Guest Editor
National Research Center of Pumps, Jiangsu University, 301# Xuefu Road, Zhenjiang 212013, China
Interests: pump; pump as turbine; intelligent optimization; unsteady flow; flow-induced vibration
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Djordje Cantrak

E-Mail Website
Guest Editor
Hydraulic Machinery and Energy Systems, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11120 Belgrade, Serbia
Interests: hydraulic machines; energy systems; experimental investigation of turbulence; particle image velocimetry (PIV); energy efficiency
Special Issues, Collections and Topics in MDPI journals
Dr. Wenjie Wang

E-Mail Website
Guest Editor
National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China
Interests: pumps; pump turbine; design and optimization; transient processes; intelligent algorithm
Special Issues, Collections and Topics in MDPI journals
Dr. Xingcheng Gan

E-Mail Website
Guest Editor
National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Interests: pump; pump as turbine (PAT); energy efficiency enhancement; computational intelligence

Special Issue Information

Dear Colleagues,

Wind power, solar power, and other renewable energy sources for electricity generation exhibit strong intermittency, randomness, and fluctuations. As the proportion of new high-level energy power grids increases, the flexibility and security of the power system face enormous challenges.

Fluid-machinery-storage hydropower is one of the best methods to maintain balance in the grid load, enabling the large-scale complementary utilization of new energy and the optimal allocation of resources. However, conventional fixed-speed pumped storage units have drawbacks, such as narrow operating ranges for turbines and nonadjustable input power for pumps, resulting in an inadequate capacity to regulate the fluctuations of new energy sources like wind and photovoltaics. Variable-speed pumped storage hydroelectric turbines, on the other hand, offer advantages such as flexible and adjustable power outputs and a wide operating range, making them the preferred technology for new pumped storage power stations. Currently, variable-speed pump-turbines still face challenges, such as an incomplete hydraulic design theory and difficulties controlling hydraulic instability during transitional processes.

This Special Issue on “Research on fluid machinery for renewable energy” aims to report recent advances in the development of fluid machinery. Topics of interest include, but are not limited to, the following:

  1. The characteristics and mechanisms of complex flow in fluid machinery for renewable energy;
  2. Advanced recognition approaches for complex flows or processes of fluid machinery for renewable energy;
  3. Advanced design and optimization techniques for fluid machinery and systems for renewable energy;
  4. Performance enhancements of fluid machinery and systems for renewable energy.

Prof. Dr. Ji Pei
Prof. Dr. Djordje Cantrak
Dr. Wenjie Wang
Dr. Xingcheng Gan
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. Processes 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

  • fluid machinery
  • renewable energy
  • CFD simulation
  • experimental measurement
  • energy storage system
  • design and optimization

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Published Papers (3 papers)

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Research

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14 pages, 6240 KiB  
Article
The Effect of Drive Signals on Output Performance of Piezoelectric Pumps
by Meng Jie, Zhenxiang Qi, Wenxin Yu, Tengfei Ma, Lutong Cai, Yejing Zhao and Yali Gao
Processes 2024, 12(11), 2343; https://doi.org/10.3390/pr12112343 - 25 Oct 2024
Viewed by 482
Abstract
The output performance of piezoelectric pumps is not only affected by the structural design but is also related to the drive signal. To study the effect of different drive signals on the output performance of piezoelectric pumps, this paper takes dual-chamber serial piezoelectric [...] Read more.
The output performance of piezoelectric pumps is not only affected by the structural design but is also related to the drive signal. To study the effect of different drive signals on the output performance of piezoelectric pumps, this paper takes dual-chamber serial piezoelectric pumps as the investigation object, theoretically deduces the effective value of the drive signal and the output performance of the piezoelectric pump, and tests the displacement of piezoelectric vibrator center, the output performance of the piezoelectric pump, and the operating noise within the range of 0–500 Hz, respectively, driven by square waves, sine waves, and triangular waves (the peak-to-peak values of which are all 300 V). The results show that at low frequencies, the piezoelectric vibrator’s center displacement curve matches the drive signal, which is sinusoidal and decreases with frequency. Under the square drive, the piezoelectric pump has the best performance, with a flow of 147.199 mL/min and pressure of 14.42 kPa, but the noise is also the highest. The output performance of the sine wave is better than that of the triangular wave, and the flow rate of the three signals shows a trend of first increasing and then decreasing. Full article
(This article belongs to the Special Issue Advanced Design, Analysis and Optimization Techniques of Fluid Machinery Systems for Renewable Energy Storage)
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22 pages, 9646 KiB  
Article
Study on the Structural Characteristics of Bulb Tubular Pumps Based on Fluid–Structure Interaction
by Wenjie Wang, Jingyu Li, Chunhui Wu, Ji Pei, Can Luo and Bo Hu
Processes 2024, 12(8), 1641; https://doi.org/10.3390/pr12081641 - 4 Aug 2024
Viewed by 993
Abstract
As a special type of through-flow device, bulb turbine pumps have been widely used in the Eastern Route of the South-to-North Water Diversion Project due to their compact structure, flexible installation process, easy maintenance, high efficiency, and strong adaptability. Therefore, structural improvements to [...] Read more.
As a special type of through-flow device, bulb turbine pumps have been widely used in the Eastern Route of the South-to-North Water Diversion Project due to their compact structure, flexible installation process, easy maintenance, high efficiency, and strong adaptability. Therefore, structural improvements to enhance their safety and stability through fluid–structure interaction analysis have significant engineering value. This paper conducts static and transient fluid–structure interaction analyses of the bulb turbine pump structure. The results show that the rotor structure experiences the greatest deformation under low-flow conditions, with maximum deformation (2.13 mm) occurring at the leading edge of the impeller inlet and decreasing radially along a gradient distribution. The damping effect of water changes the mode shapes of the rotor structure, and although the vibration modes under wet conditions are similar to those in the air, the frequencies decrease to varying degrees. In transient analyses under different conditions, the total deformation of the rotor system is greater than in static analyses, showing significant regularity. Under low-flow conditions, the deformation of the pressure surface at the inlet and outlet of the blade tip is greater than that of the suction surface, with a maximum total deformation of 3.656 mm. The maximum total deformation under design flow is 3.337 mm; under high flow, it is 2.646 mm. The total deformation of the casing mainly occurs on both sides of the internal bulb body bottom support, with a maximum deformation of 2.0355 mm and an equivalent stress maximum of 44.848 MPa. The equivalent stress and total deformation distribution of the support structure are similar, located at the top support and trailing edge, with a maximum value of 22.94 MPa at the trailing edge. The research results provide technical references and theoretical foundations for the structural optimization of bulb turbine pumps. Full article
(This article belongs to the Special Issue Advanced Design, Analysis and Optimization Techniques of Fluid Machinery Systems for Renewable Energy Storage)
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Review

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30 pages, 14485 KiB  
Review
A Review of the Building Heating System Integrated with the Heat Pipe
by Suiju Dong, Juanjuan Chen, Chunwang Lv, Tianhao Yuan, Yin Liu, Xiaoqing Huang and Zeyu Liu
Processes 2024, 12(10), 2218; https://doi.org/10.3390/pr12102218 - 11 Oct 2024
Viewed by 785
Abstract
The heat pipe (HP) is widely applied in the thermal management field at present. In order to make use of the low-grade and renewable energies to maintain building thermal comfort in the heating season, more and more studies with respect to improving the [...] Read more.
The heat pipe (HP) is widely applied in the thermal management field at present. In order to make use of the low-grade and renewable energies to maintain building thermal comfort in the heating season, more and more studies with respect to improving the thermal performance of the building heating system integrated with the HP (BHSIHP), such as the floor heating system integrated with the HP (FHSIHP), the thermal storage wall heating system integrated with the HP (TSWIHP), conventional wall integrated with the HP (WIHP) and radiator heating system integrated with the HP (RHSIHP), are conducted. This paper aims to summarize different types of HPs applied in the building heating system and offers an overview of the thermal performance improvement for the BHSIHP. The thermal response, thermal conductivity, thermal resistance, heat capacity, heat transfer coefficient, temperature distribution, thermal storage and heat release capacity are always selected to investigate characteristics of the BHSIHP. Results show that the thermal performance of the FHSIHP, the TSWIHP, the WIHP and the RHSIHP is more outstanding than that of the conventional heating system. The thermal performance of the BHSIHP is affected by heat source temperature, installation tilt angle, working fluid, and filling ratio of the HP. The heat source temperature, which positively affects the performance of the BHSIHP, is crucial for the selection of the working fluid and filling ratio. However, the performance of the BHSIHP is increased first and then decreased with the increase of the installation tilt angle. The optimal filling ratio of the working fluid has been proven not to be a fixed value. Full article
(This article belongs to the Special Issue Advanced Design, Analysis and Optimization Techniques of Fluid Machinery Systems for Renewable Energy Storage)
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