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Water
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Hydraulics and Hydrodynamics in Fluid Machinery
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Hydraulics and Hydrodynamics in Fluid Machinery

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Hydraulics and Hydrodynamics".

Deadline for manuscript submissions: 30 August 2024 | Viewed by 3663

Special Issue Editors

Prof. Dr. Chuan Wang

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Guest Editor
College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, China
Interests: fluid machinery; optimization design of pumps; internal flow theory of pumps; interference mechanism of jet and rotating fluid
Special Issues, Collections and Topics in MDPI journals
Dr. Bo Hu

E-Mail Website
Guest Editor
Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
Interests: fluid machinery; flow and heat transfer; flow–structure coupling; multiphase flow
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Hui Quan

E-Mail Website
Guest Editor
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, China
Interests: fluid machinery; multiphase flow; optimal design
Dr. Yong Zhu

E-Mail Website
Guest Editor
National Research Center of Pumps, Jiangsu University, Zhenjiang 212003, China
Interests: fluid transmission; intelligent control; signal processing; fault diagnosis; intelligent maintenance
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Where fluid flows, fluid machinery works. Therefore, fluid machinery occupies an important position in the social economy. As classic power machinery, there is a complex flow structure in fluid machinery. An in-depth study of the internal hydraulics and hydrodynamics in fluid machinery can effectively improve its efficiency and operational stability. Therefore, we are looking forward to receiving original contributions to this Special Issue on Hydraulics and Hydrodynamics in Fluid Machinery, on topics including, but not limited to:

  • Hydraulics and hydrodynamics in fluid machinery using theoretical analysis;
  • Hydraulics and hydrodynamics in fluid machinery using numerical calculations;
  • Hydraulics and hydrodynamics in fluid machinery using experimental methods;
  • Fluid–structural coupling analysis of fluid machinery;
  • Cavitation and multi-phase flow of fluid machinery;
  • New energy systems, simulation, and optimization;
  • Other aspects of fluid machinery.

Prof. Dr. Chuan Wang
Dr. Bo Hu
Prof. Dr. Hui Quan
Dr. Yong Zhu
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. Water 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

  • hydraulics
  • hydrodynamics
  • pumps
  • compressors
  • turbo-machinery system
  • fans and blowers
  • hydro-turbine
  • propulsion
  • jet
  • cavitation and multi-phase flow
  • renewable energy
  • optimization

Published Papers (4 papers)

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Research

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16 pages, 5646 KiB  
Article
Pressure Pulsation Characteristics on the Bulb Body of a Submersible Tubular Pump
by Jian Wang, Ze Chen, Linghao Li, Chuan Wang, Kangle Teng, Qiang He, Jiren Zhou, Shanshan Li, Weidong Cao, Xiuli Wang and Hongliang Wang
Water 2024, 16(5), 789; https://doi.org/10.3390/w16050789 - 06 Mar 2024
Viewed by 608
Abstract
Submersible tubular pumps are an ideal choice for pump stations that require high flow rates and low lift. These pumps combine the unique features of submersible motors with axial flow pump technology, making them highly efficient and cost-effective. They have found extensive applications [...] Read more.
Submersible tubular pumps are an ideal choice for pump stations that require high flow rates and low lift. These pumps combine the unique features of submersible motors with axial flow pump technology, making them highly efficient and cost-effective. They have found extensive applications in China’s rapidly developing water conservancy industry. In this research, we focus on investigating the pressure pulsation characteristics of the internal bulb body in a specific pump station project in China. To conduct our analysis, we utilize a model of the submersible tubular pump and strategically position 18 monitoring points. These monitoring points cover various sections, including the impeller inlet and outlet, guide vane outlet, as well as the inlet, middle, and outlet sections of the bulb body segment. To calculate the unsteady flow of the system, we employ numerical simulation techniques. By combining the outcomes of model tests, we determine the pressure pulsation characteristics. The comparison of results reveals a remarkable similarity between the efficiency–head curves obtained from the numerical simulation and the model test. While the model test yields slightly higher head results, the numerical simulation indicates slightly higher efficiency values. This finding lends strong support to the reliability of numerical simulation results, which can provide valuable insights for the design and optimization of submersible tubular pumps. Overall, submersible tubular pumps demonstrate their suitability for pump stations with high flow rates and low lift requirements. The study of pressure pulsation characteristics within the bulb body contributes to a better understanding of their performance and facilitates their further application in the field of water conservancy engineering. Full article
(This article belongs to the Special Issue Hydraulics and Hydrodynamics in Fluid Machinery)
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20 pages, 7523 KiB  
Article
Modeling of a Jet Pipe Servovalve Considering Nonlinear Flow Forces Acting on the Spool
by Shuangqi Kang, Xiangdong Kong, Jin Zhang and Ranheng Du
Water 2024, 16(5), 683; https://doi.org/10.3390/w16050683 - 26 Feb 2024
Viewed by 621
Abstract
The design and analysis of jet pipe servovalves are mostly based on linear models. However, there are some nonlinear factors in this kind of electromechanical–hydraulic structure. The article deduces a linear rotation equation for the armature assembly and a linear flow equation for [...] Read more.
The design and analysis of jet pipe servovalves are mostly based on linear models. However, there are some nonlinear factors in this kind of electromechanical–hydraulic structure. The article deduces a linear rotation equation for the armature assembly and a linear flow equation for the control cavity. With the consideration of nonlinear hydraulic reaction forces in the second stage, the nonlinear dynamic equation of the main spool in an ideal jet pipe servovalve is derived. Based on the MATLAB (R2016a) software, the nonlinear model of a certain type of jet pipe servovalve is numerically investigated. The equilibrium points of the nonlinear system are calculated, the phase portraits are plotted, and the Hopf bifurcations caused by the flow-pressure coefficient as the control parameter and the period-doubling bifurcations caused by the variation of the input signal are analyzed. The vibration frequency of the time-domain response of the fifth-order system with a cosine signal as input is 242 Hz, which is similar to the experimental value of 233 Hz. The relative error between the two is 3.9%, verifying the validity of the nonlinear system model. Full article
(This article belongs to the Special Issue Hydraulics and Hydrodynamics in Fluid Machinery)
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18 pages, 7044 KiB  
Article
Pressure Pulsation Characteristics of Agricultural Irrigation Pumps under Cavitation Conditions
by Guisheng Yu, Guohui Li and Chuan Wang
Water 2023, 15(24), 4250; https://doi.org/10.3390/w15244250 - 12 Dec 2023
Viewed by 902
Abstract
Agricultural irrigation pumps are the main agricultural irrigation machinery, and their performance is closely related to the flow characteristics inside them. This paper combines experimental research and numerical simulation analysis. Based on the good agreement between the experimental results and numerical simulation data, [...] Read more.
Agricultural irrigation pumps are the main agricultural irrigation machinery, and their performance is closely related to the flow characteristics inside them. This paper combines experimental research and numerical simulation analysis. Based on the good agreement between the experimental results and numerical simulation data, this paper focuses on studying the characteristics of pressure fluctuations of agricultural irrigation pumps under cavitation conditions. The study found that under non-cavitation conditions, the pressure fluctuations at different monitoring points in pumps with different numbers of blades showed periodic variations, which are related to the number of blades. Under cavitation conditions, the pressure fluctuation coefficients of agricultural irrigation pumps with different impeller blade numbers increased, with a significant impact on the distribution of radial forces on the impeller. The research results supplement the relevant theoretical analysis and have certain practical significance for the application of agricultural irrigation pumps to practical production. Full article
(This article belongs to the Special Issue Hydraulics and Hydrodynamics in Fluid Machinery)
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Review

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32 pages, 6673 KiB  
Review
Research Progress on Identification and Suppression Methods for Monitoring the Cavitation State of Centrifugal Pumps
by Yu Zhu, Lin Zhou, Shuaishuai Lv, Weidong Shi, Hongjun Ni, Xiaoyuan Li, Chuanzhen Tao and Zhengjie Hou
Water 2024, 16(1), 52; https://doi.org/10.3390/w16010052 - 22 Dec 2023
Viewed by 897
Abstract
Cavitation is a detrimental phenomenon in hydraulic machinery, adversely impacting its performance, inducing vibration and noise, and leading to corrosion damage of overflow components. Centrifugal pump internal cavitation will lead to severe vibration and noise, and not only will the performance of hydraulic [...] Read more.
Cavitation is a detrimental phenomenon in hydraulic machinery, adversely impacting its performance, inducing vibration and noise, and leading to corrosion damage of overflow components. Centrifugal pump internal cavitation will lead to severe vibration and noise, and not only will the performance of hydraulic machinery be adversely affected but the impact generated by the collapse of the vacuole will also cause damage to the impeller wall structure, seriously affecting the safety of the equipment’s operation. To prevent the generation and development of internal cavitation in centrifugal pumps, to prevent the hydraulic machinery from being in a state of cavitation for a long time, to avoid the failure of the unit, and to realize the predictive maintenance of centrifugal pumps, therefore, it is of great significance to research the methods for monitoring the cavitation of hydraulic machinery and the methods for suppressing the cavitation. This paper comprehensively describes the centrifugal pump cavitation mechanism and associated hazards. It also discusses the current state of centrifugal pump cavitation monitoring methods, including commonly used approaches such as the flow-head method, high-speed photography, pressure pulsation method, acoustic emission method, and vibration method. A comparative analysis of these methods is presented. Additionally, the paper explores signal characterization methods for centrifugal pump cavitation, including time-domain feature extraction, frequency-domain feature extraction, and time–frequency-domain feature extraction. The current research status is elaborated upon. Moreover, the paper presents methods to mitigate cavitation and prevent its occurrence. Finally, it summarizes the ongoing research on identifying and determining the cavitation state in centrifugal pumps and offers insights into future research directions. Full article
(This article belongs to the Special Issue Hydraulics and Hydrodynamics in Fluid Machinery)
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