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Готові списки джерел за темами / Cavitation erosion characteristic / Статті в журналах

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Статті в журналах з теми "Cavitation erosion characteristic"

Автор: Grafiati

Опубліковано: 28 травня 2022

Оновлено: 31 липня 2025

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1

Mitelea, Ion, Ilare Bordeașu, Florin Frant, Ion-Dragoș Uțu, Corneliu Marius Crăciunescu, and Cristian Ghera. "Cavitation Erosion Characteristics of the EN AW-6082 Aluminum Alloy by TIG Surface Remelting." Materials 16, no. 7 (2023): 2563. http://dx.doi.org/10.3390/ma16072563.

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Анотація:

Components made of aluminum alloys operating under cavitation erosion conditions have low performance and therefore a reduced lifetime. The degradation of these components is a consequence of the repetitive implosion of cavitation bubbles adjacent to the solid surface. In this paper, the effect of the rapid re-melting and solidification modification of the surface microstructure of parts of an Al-based alloy strengthened by artificial ageing on the reduction of material loss through cavitation erosion was investigated. The heat source used was the electric arc generated between a tungsten elec

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2

Guo, Qiwei, and Ning Chen. "Centrifugal pump cavitation and cavitation erosion analysis." Journal of Physics: Conference Series 3046, no. 1 (2025): 012017. https://doi.org/10.1088/1742-6596/3046/1/012017.

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Abstract The phenomena of cavitation and cavitation corrosion exist widely in the fields of hydraulic machinery, ship propulsion, water conservancy, and hydropower etc., which often bring negative impacts, but their research is significant for energy-saving technology. This paper discusses the importance of pump cavitation and cavitation from numerical simulation and experimental measurement. Numerical simulations reveal that cavitation in centrifugal pumps begins at the impeller inlet vanes, and the extent of the cavitation bubbles increases and expands along the flow path. When serious, the

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3

Mitelea, Ion, Daniel Mutașcu, Ion-Dragoș Uțu, Corneliu Marius Crăciunescu, and Ilare Bordeașu. "Cavitation Erosion of the Austenitic Manganese Layers Deposited by Pulsed Current Electric Arc Welding on Duplex Stainless Steel Substrates." Crystals 14, no. 4 (2024): 315. http://dx.doi.org/10.3390/cryst14040315.

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Fe-Mn-Cr-Ni alloys like Citomangan, delivered in the form of powders, tubular wires, and coated electrodes, are intended for welding deposition operations to create wear-resistant layers. Their main characteristic is their high capacity for surface mechanical work-hardening under high shock loads, along with high toughness and wear resistance. In order to increase the resistance to cavitation erosion, hardfacing of Duplex stainless steel X2CrNiMoN22-5-3 with Citomangan alloy was performed using a new welding technique, namely one that uses a universal TIG source adapted for manual welding with

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4

Shrestha, Rakish, Samman Singh Pradhan, Prithivi Gurung, Amul Ghimire, and Sailesh Chitrakar. "A review on erosion and erosion induced vibrations in Francis turbine." IOP Conference Series: Earth and Environmental Science 1037, no. 1 (2022): 012028. http://dx.doi.org/10.1088/1755-1315/1037/1/012028.

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Abstract Vibrations are one of the major issues observed during the operations of Francis turbine as they are frequently operated outside their optimal operating range, with rapid load changes. In hydropower plants, vibrations occur in various parts which can be classified as: hydraulic civil parts such as reservoir, intake, dam, tail race etc. mechanical parts such as penstock, turbine, draft tube and shaft, and electrical parts such as generator and transformer. However, due to the sediments and cavitation problems, the regions around rotating parts such as turbine experiences severe vibrati

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5

Sălcianu, Cornelia Laura, Ilare Bordeaşu, Ion Mitelea, and Lavinia Madalina Micu. "Mechanical Hardening and Resistance to Cavitation Erosion of the Austenitic Stainless Steels with Varying Proportions of Delta Ferrite." Advanced Materials Research 1111 (July 2015): 127–32. http://dx.doi.org/10.4028/www.scientific.net/amr.1111.127.

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The paper analyzes, comparative, the resistance to the cavitation erosion for the X5CrNi18-10 classic steel, with that provided by two another steels, processed experimental, with approx. 0.1 % C, 24% Cr, 18 % , approx. 10% Ni and wich was mechanically hardened by vibro rolling. Cavitation tests were performed on a vibrating device with piezoelectric crystal, in the Laboratory of Hydraulic Machines in Timisoara ( LMHT ), determining the characteristic curves of the variation in time of the mean depth erosion, MDE (t ) and mean depth erosion rate, MDER (t). By mechanical tests and by metallogra

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6

Lazăr, Iosif, Ilare Bordeaşu, Ion Mitelea, et al. "Evaluation of the Behavior and Resistance to Cavitation Erosion of the Structure of the CuSn12-C Bronze Obtained by Thermal Treatment of Quenching and Tempering." Key Engineering Materials 890 (June 23, 2021): 165–72. http://dx.doi.org/10.4028/www.scientific.net/kem.890.165.

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Анотація:

The paper presents the results of the research on the vibration cavitation erosion of the CuSn12-C bronze, subjected to the volumetric heat treatment of quenching to 700 °C, with water cooling, followed by tempering to 250 °C, with slow cooling in the air. The applied heat treatment shows the improvement of the behavior and the resistance to the cavitation erosion, compared to the initial state, of molded semi-finished product. The evaluation of the behavior and the resistance to the cavitation erosion is made by comparing the value of the parameters MDEmax, Rcav and Rz with those of the deliv

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7

Korobov, Yury, Hussam Alwan, Aleksey Makarov, et al. "Comparative study of cavitation erosion resistance of austenitic steels with different levels of metastability." Metal Working and Material Science 24, no. 1 (2022): 61–72. http://dx.doi.org/10.17212/1994-6309-2022-24.1-61-72.

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Introduction. Reliability-critical components of equipment working in contact with high-speed liquid media (for example, turbine blades of hydroelectric power stations, pump impellers, ship propellers) are subjected to one of the types of wear – cavitation erosion. The current study aims to select and scientifically substantiate the type of coating and its structural-phase state for the effective protection of parts from cavitation erosion. Research methods. The study carries out a comparative analysis of differences in the cavitation erosion resistance of characteristic austenitic steels, in

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8

Zhu, Han, Ning Qiu, Chuan Wang, et al. "Prediction of Cavitation Evolution and Cavitation Erosion on Centrifugal Pump Blades by the DCM-RNG Method." Scanning 2021 (November 15, 2021): 1–12. http://dx.doi.org/10.1155/2021/6498451.

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Cavitation can reduce the efficiency and service life of the centrifugal pumps, and a long-term operation under cavitation conditions will cause cavitation damage on the surface of material. The external characteristic test of the IS65-50-174 single-stage centrifugal pump was carried out. Moreover, the cavitation mechanism under specific conditions was analyzed by numerical simulation. Considering the macroscopic cavitation flow structure in the centrifugal pump, three different cavitation erosion prediction methods were used to predict the erodible areas. The results show that the calculation

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9

ROMANOV, Alexey A., Sergey V. EVDOKIMOV, and Vladimir A. SELIVERSTOV. "STUDY OF THE PROCESS OF CAVITATION EROSION ON THE IMPELLERS OF THE ZHIGULI HYDROELECTRIC POWER PLANT." Urban construction and architecture 8, no. 2 (2018): 56–59. http://dx.doi.org/10.17673/vestnik.2018.02.9.

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The results of studying the process of cavitation erosion on the blades of the impellers of the Zhigulevskaya hydroelectric power plant are presented. The technique of carrying out full-scale cavitation tests by the method of high-speed erosion with the use of soft metal plates pasted onto the suspected zones of the appearance of cavitation damages is described. Cavitation tests were carried out for three characteristic operating modes, with a substantiation of the technological peculiarity of full-scale operation of hydroturbine installations. The results of the investigation of the turbine b

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10

Salcianu, Cornelia Laura, Ilare Bordeaşu, Brandusa Ghiban, et al. "Research on the Influence of the Heat Treatment Temperature on the Cavitation Behavior of the Aluminum Alloy 2017 A." Solid State Phenomena 349 (September 6, 2023): 55–62. http://dx.doi.org/10.4028/p-t5fhog.

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Анотація:

The good mechanical properties of aluminum alloy 2017 A have determined its use in a wide range of applications in which cavitational solocitations occur, such as hydraulic actuation installations, heat engine blocks, boat propellers and sloops, pumps in the cooling system of thermal engines, wings and ogives of airplanes. Currently, research is focused on the development of procedures for improving the resistance to cavitational erosion of these materials. This paper presents the results of the research on the cavitation erosion behavior of the material subjected to thermal aging treatment at

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11

Ghera, Cristian, Ilare Bordeaşu, Alexandru Nicolae Luca, et al. "Increasing the Resistance to Cavitation Erosion of 6082 Aluminum Alloys through Thermal Aging Treatments at 140°C and Holding Time of 12 Hours." Solid State Phenomena 349 (September 6, 2023): 63–70. http://dx.doi.org/10.4028/p-qps3kf.

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Анотація:

The use of aluminum alloys in the manufacture of hydropneumatic systems components is very known. However, the knowledge of their behavior under cavitational demands, determinated of flow of the working liquid, is limited. For this reason, in recent years, the older research, carried out on this type of material and on some of its alloys, regarding the resistance to cavity erosion, has been resumed, especially since the mechanical properties and reduced mass are an advantage for the parts that work in this conditions (ship propellers, pumps and bodies of hydraulic devices, etc.). Therefore, th

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12

Bordeaşu, Ilare, Nicușor Alin Sîrbu, Iosif Lazăr, et al. "New Results of the Heat-Treated CuZn39Pb3 Brass Behavior and Resistance to Cavitation Erosion." Key Engineering Materials 890 (June 23, 2021): 173–80. http://dx.doi.org/10.4028/www.scientific.net/kem.890.173.

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Анотація:

The paper presents the results of the behavior and resistance to the erosion by vibrating cavitation of the CuZn39Pb3 brass, obtained by quenching the volume heat treatment from 800°C with water cooling, followed by the stress-relief to 250°C, with air cooling. Comparison with both the delivery status and the naval brass (used for ship propellers), based on the characteristic parameters values, recommended by the ASTM G32 standards and used in the Cavitation Laboratory of the Polytechnic University of Timisoara, shows that the hardness increase resulted from the heat treatment led to a signifi

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13

PHILIPP, A., and W. LAUTERBORN. "Cavitation erosion by single laser-produced bubbles." Journal of Fluid Mechanics 361 (April 25, 1998): 75–116. http://dx.doi.org/10.1017/s0022112098008738.

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In order to elucidate the mechanism of cavitation erosion, the dynamics of a single laser-generated cavitation bubble in water and the resulting surface damage on a flat metal specimen are investigated in detail. The characteristic effects of bubble dynamics, in particular the formation of a high-speed liquid jet and the emission of shock waves at the moment of collapse are recorded with high-speed photography with framing rates of up to one million frames/s. Damage is observed when the bubble is generated at a distance less than twice its maximum radius from a solid boundary (γ=2, where γ=s/R

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14

Huang, Jia-le, Huai-yu Cheng, Yan-tao Cao, and Bin Ji. "Influence of hydrofoil characteristic thickness on the cavitation erosion risk distribution of clearance vortex cavitation and its mechanisms." Journal of Hydrodynamics 37, no. 1 (2025): 50–62. https://doi.org/10.1007/s42241-025-0014-5.

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15

Gupta, Ankush, Grace K. McDonough, Jennifer Moreira, et al. "Passive cavitation imaging in fuel injector nozzles." Journal of the Acoustical Society of America 152, no. 4 (2022): A246. http://dx.doi.org/10.1121/10.0016157.

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Modern fuel injection systems operate at high pressures and flow velocities. Injectors can be pressurized in excess of 10 MPa, resulting in fuel velocities on the order of hundreds of meters/second in the mm and sub-mm internal confines of a fuel injector. Subsequent ejection velocities at the nozzle yield characteristic atomization droplet size distributions and spread angles. Studies have shown or inferred the presence of cavitation in such fuel injectors, typically beneficially decreasing ejection droplet sizes while increasing the spray spreading angle. While beneficial for fuel atomizatio

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16

Yang, Huan, Jing Luo, Sen Hui, Shi Yin Qiu, Rong Ping Xue, and Yi Bo Zhang. "The Static Analysis of Pilot Type Zero Steady-State Error of Water Hydraulic Pressure Reducing Valve." Applied Mechanics and Materials 444-445 (October 2013): 468–75. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.468.

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The static-state error is existed in the pressure valve, coupled with the characteristics of high vaporization pressure, low viscosity, and small compressibility, so that the fluid dynamics and friction force of hydraulic pressure valve are increased. The pressure valve will easily come up with produce cavitation erosion and wire drawing. Those appearances would seriously affect the performance of the pressure valve and its life cycle. A new type of static water pressure reducing valve is designed in this paper. It has a special structure which can complete the internal dynamic pressure feedba

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17

Xia, Dong Sheng, Yan Yu, and Hui Chen Zhang. "Numerical Simulation of Magnetostriction-Induced Cavitation Flow." Applied Mechanics and Materials 477-478 (December 2013): 271–76. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.271.

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The magnetostriction-induced cavitation flow was numerically simulated by using a full cavitation model with the SSTk-ωturbulence model and the dynamic mesh technique. The characteristics of ultrasonic cavitation flow and the cavitation erosion mechanism were revealed. The computational results show that the pressure fluctuation possesses the characteristics of pulse on the specimen. Intense pressure pluses and cavitation occur in the local flow adjacent to the specimen. As numerous bubbles collapse, intense pressure pulses form on the specimen. Cavitation intensity is serious at the center wh

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18

Fujisawa, Nobuyuki, Takayuki Yamagata, Ryotaro Seki, and Motofumi Ohki. "Erosion Mechanism of a Cavitating Jet on Groove Roughness." Fluids 6, no. 1 (2020): 6. http://dx.doi.org/10.3390/fluids6010006.

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The erosion behavior of a cavitating jet on groove roughness was investigated experimentally using mass-loss characteristics, scanning electron microscopy (SEM) observation, time-resolved shadowgraph, and schlieren flow visualizations. The wall morphology of the cavitating-jet erosion on the groove roughness indicated an increased mass loss, which was highly increased along the groove rather than across the groove. Furthermore, increased erosion pits were observed on the groove bottom along the grooves. The shadowgraph imaging of the cavitating jet on the rough wall showed noncircular cavitati

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19

Kim, Seong Jong, Min Su Han, and Seung Jun Lee. "Effect of Zn Primer Coating on Electrochemical Properties in Seawater." Advanced Materials Research 811 (September 2013): 46–53. http://dx.doi.org/10.4028/www.scientific.net/amr.811.46.

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Conventional ships generated almost no cavitation erosion because they traveled at low speed. Thus, most ships have used painting, ICCP and sacrificial anode system. However, with the activation of international trading, and the increase of low-price, large-volume cargos, ships are becoming larger and faster. As a result, damages due to cavitations and corrosions have accelerated. Cavitation and erosion corrosions cause damages to materials by physical shock waves generated from the collapse of bubbles which are generated when the moving parts rotate in seawater. The stern in particular is exp

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20

Liu, Boshen, and Fei Ma. "Erosion Characteristics and the Corresponding Self-Resonating Oscillations of Cavitating Jet on Oblique Surfaces." Energies 13, no. 10 (2020): 2563. http://dx.doi.org/10.3390/en13102563.

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The erosion and the corresponding self-resonating oscillations of the cavitating jet were experimentally investigated on the oblique surfaces. To evaluate the intensities of erosion and self-resonating oscillations of the jet, mass loss, surface morphology of the eroded specimens, upstream fluctuating pressure and unsteady cavitation noise were obtained at a series of stand-off distance ratios l d / d t in the cases where the oblique angles are α = 0°, 5°, 15° and 30°. In the low l d / d t range, with the increase of α , the erosion gradually transforms from two isolated circular erosion rings

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21

Predin, Andrej, Boštjan Gregorc, and Ignacijo Biluš. "CAVITATION SWIRL AT THE ENTRANCE OF CENTRIFUGAL PUMP." Journal of Energy Technology 2, no. 3 (2024): 85–98. https://doi.org/10.18690/jet.2.3.85-98.2009.

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The trend toward higher speed and power in order to achieve high performance characteristics has inevitably increased the potential for operating instabilities in modern pumps. Even in theabsence of cavitation and its complications, these phenomena can lead to performance loss and, in the worst cases, to structural failure. One of the major sources of instability in a centrifugal pump is, as mentioned, cavitation within the pump. Cavitation of a centrifugal pump is the result of insufficient net positive suction head and can occur within the entire range of operating conditions. Cavitation may

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22

Liu, Chengting, Gang Liu, and Zuoxiu Yan. "Study on Cleaning Effect of Different Water Flows on the Pulsed Cavitating Jet Nozzle." Shock and Vibration 2019 (June 11, 2019): 1–15. http://dx.doi.org/10.1155/2019/1496594.

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The method of cleaning by self-excited pulsed cavitating jet was proposed according to cleaning characteristics and requirements of large storage equipment. This method has many advantages compared with other cleaning methods. In order to achieve the optimum cleaning effects, experimental research on working status of the nozzle at different flow rates was conducted and analysis was carried out from the following four aspects: cavitation morphology, pressure pulse frequency, velocity fluctuation amplitude, and erosion effect. The research results showed that flushing effects in the nozzle with

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23

Тараненко, М. Є., та Н. В. Кобріна. "ПІДТРИМКА ТОЧНОСТІ ЗНАЧЕНЬ КЕРУЮЧИХ ПАРАМЕТРІВ ЕЛЕКТРОГІДРАВЛІЧНОГО НАВАНТАЖЕННЯ ПРИ ШТАМПОВЦІ З ПРОСТОРОВО-ЧАСОВИМ КЕРУВАННЯМ". Open Information and Computer Integrated Technologies, № 99 (24 червня 2024): 78–85. http://dx.doi.org/10.32620/oikit.2023.99.07.

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The article is devoted to ensuring the stability of the technological process of electrohydraulic stamping of thin-sheet large-sized parts. This process is realised on multi-contour EH presses equipped with the capabilities of space-time control of the workpiece load. This control ensures the production of high-quality parts and high technical and economic performance of the process.The control parameters include the geometry of the press energy release zone, the loading sequence of the workpiece sections and the value of the inter-electrode distance. The first parameters change little under s

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24

Bordeasu, Ilare, Alexandru Nicolae Luca, Cristan Ghera, Cornelia Laura Salcianu, Daniel Ostoia, and Lavinia Madalina Micu. "Considerations on the Behaviour and Resistance of Aluminium Alloys to Cavitation Erosion." Materials Science Forum 1132 (November 8, 2024): 21–34. http://dx.doi.org/10.4028/p-p2eord.

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Aluminum alloys are known for their wide application in the automotive, river and marine boat constructions, but also in hydraulic systems (radiators/oil coolers). Their use is made by manufacturing parts directly from the semi-finished state, with or without certain volumetric heat treatments and surface hardening, depending on the functional role and the physical-mechanical characteristics pursued. Some of these parts work in hydrodynamic conditions, where cavitation manifests itself through erosion, such as: propellers of boats and barges, pump rotors in water cooling systems of automobiles

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25

He, Jie, Xiumei Liu, Beibei Li, Jixing Zhai, and Jiaqing Song. "Cavitation Erosion Characteristics for Different Metal Surface and Influencing Factors in Water Flowing System." Applied Sciences 12, no. 12 (2022): 5840. http://dx.doi.org/10.3390/app12125840.

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The impact of cavitation erosion behavior on different metals in a water flowing system was investigated experimentally. A flowing system of water was built and a transparent observation window is designed to capture the cavitation flow. Erosion tests were carried out on red copper, brass, pure aluminum, and an aluminum alloy. The cavitation behaviors are presented by the weight loss and cavitation erosion rate, and related changes in the topography of the metal surface are also discussed. The variation in the cavitation erosion on metallic specimens with increasing time could be divided into

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26

Bordeasu, Ilare, Brândușa Ghiban, Lavinia Madalina Micu, Alexandru Nicolae Luca, Alin Mihai Demian, and Dionisie Istrate. "The Influence of Heat Aging Treatments on the Cavitation Erosion Behavior of a Type 6082 Aluminum Alloy." Materials 16, no. 17 (2023): 5875. http://dx.doi.org/10.3390/ma16175875.

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Анотація:

It is known that a number of parts that operate in liquid media, such as the propellers of motorboats and pleasure river vessels, as well as the rotors of household pumps and the radiators and pumps in the cooling system of motor vehicles are made, as a rule, of aluminum-based alloy. Research during maintenance leads to the conclusion that, in certain operating conditions, due to the turbulent character of the flow, with pressure drops to below the vaporization level, it inevitably reaches the threshold of cavitation, which manifests itself through its effects, especially through erosion. To i

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27

Wang, Xin, and Ting-Qiang Xie. "Cavitation erosion behavior of hydraulic concrete under high-speed flow." Anti-Corrosion Methods and Materials 69, no. 1 (2021): 81–93. http://dx.doi.org/10.1108/acmm-03-2021-2459.

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Purpose Cavitation erosion has always been a common technical problem in a hydraulic discharging structure. This paper aims to investigate the cavitation erosion behavior of hydraulic concrete under high-speed flow. Design/methodology/approach A high-speed and high-pressure venturi cavitation erosion generator was used to simulate the strong cavitation. The characteristics of hydrodynamic loads of cavitation bubble collapse zone, the failure characteristics and the erosion development process of concrete were investigated. The main influencing factors of cavitation erosion were discussed. Find

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28

Lv, Dongli, Zhanghua Lian, and Tao Zhang. "Study of Cavitation and Cavitation Erosion Quantitative Method Based on Image Processing Technique." Advances in Civil Engineering 2018 (July 22, 2018): 1–10. http://dx.doi.org/10.1155/2018/5317578.

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Cavitation erosion on the wetted surface of hydraulic machinery is directly related to the cavitation behavior. In this paper, the cavitation behavior and cavitation erosion characteristics on the airfoil surface were observed experimentally, and then, image processing methods for quantifying cavitation structure and cavitation erosion were established. Laser-CCD system was used to obtain the cavitation structure on the airfoil surface and the microtopographies of the cavitation erosion at different magnifications were obtained by SEM. The distribution and shape of cavitation pits were analyze

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29

Jing, Luo, and Li Jian. "Erosion characteristics in ultrasonic cavitation." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 223, no. 7 (2009): 985–91. http://dx.doi.org/10.1243/13506501jet593.

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30

Zhai, Yanwei, Weilin Xu, Jing Luo, and Qi Zhang. "Experimental study on the effect of a deformable boundary on the collapse characteristics of a cavitation bubble." Thermal Science 23, no. 4 (2019): 2195–204. http://dx.doi.org/10.2298/tsci1904195z.

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Анотація:

Cavitation phenomena widely exist in many fields such as medical treatment, chemical engineering, and hydraulic engineering. The boundary properties have a great influence on the collapse characteristics of a cavitation bubble. The interaction between a cavitation bubble and a boundary of different properties is an important part in the cavitation erosion mechanism. In this paper, cavitation bubbles under in-water pulse discharge and cavitation erosion under ultrasonic vibration were used to study the effect of a deformable boundary on the collapse characteristics of a cavitation bubble, which

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31

Jeon, Woo-Seck, and Il-Cho Park. "Effect of Marine Coolant Additives on Cavitation Erosion–Corrosion of Diesel Engine Cylinder Liner." Applied Sciences 15, no. 11 (2025): 6353. https://doi.org/10.3390/app15116353.

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In this study, cavitation erosion tests were conducted to investigate the effects of the presence of coolant additives and chlorides on the corrosion and cavitation erosion of cylinder liners in marine diesel engines. Electrochemical experiments were conducted to evaluate the corrosion characteristics of ductile cast iron (DCI), and the corrosion potential and corrosion current density were measured. In addition, weight loss, surface roughness, and maximum surface damage depth were quantified as a function of cavitation exposure time. Furthermore, to investigate the erosion and erosion–corrosi

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32

Han, Min Su, Il Cho Park, Jae Cheul Park, Jae Yong Jeong, and Seong Jong Kim. "Complex Behavior Using the Hybrid Method of Cavitation and Electrochemical Corrosion for Casted Al Bronze." Advanced Materials Research 811 (September 2013): 113–19. http://dx.doi.org/10.4028/www.scientific.net/amr.811.113.

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The sustainable development of engineering, mechanical instrument requires higher speed and higher power. It cause a physical damage is excessive damage for underwater rotating system as cavitations and erosion, but also electrochemical corrosion by chloride ion and flow of current in marine environment. In this study, we assessed electrochemical corrosion characteristics of aluminum-bronze that are the material for the underwater rotating system used in the ocean industry and studied the complex behavior of electrochemical corrosion and cavitation corrosion through the hybrid test that also i

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33

Zhou, Feng, Qifei Li, Lu Xin, Xiangyu Chen, Shiang Zhang, and Yuqian Qiao. "Cavitation Performance Analysis in the Runner Region of a Bulb Turbine." Processes 13, no. 7 (2025): 2231. https://doi.org/10.3390/pr13072231.

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As a core component in renewable energy systems for grid regulation, hydropower units are increasingly exposed to flow conditions that elevate the risk of cavitation and erosion, posing significant challenges to the safe operation of flow-passage components. In this study, model testing and computational fluid dynamics (CFD) simulations are employed to investigate the hydraulic performance and cavitation behavior of a bulb turbine operating under rated head conditions and varying cavitation numbers. The analysis focuses on how changes in cavitation intensity affect flow characteristics and eff

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34

Istrate, Dionisie, Ilare Bordeasu, Brândușa Ghiban, et al. "Correlation between Mechanical Properties—Structural Characteristics and Cavitation Resistance of Rolled Aluminum Alloy Type 5083." Metals 13, no. 6 (2023): 1067. http://dx.doi.org/10.3390/met13061067.

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Анотація:

The 5000 series aluminum alloy 5083 is distinguished by excellent processability, excellent welding characteristics, and a strong resilience to corrosion, particularly in maritime environments. It is employed in the manufacture of ships, automobiles, spacecraft, and industrial buildings. The goal of the current study is to determine whether there is any relationship between the mechanical properties, structural characteristics, and cavitation erosion properties of aluminum alloy 5083 in the H111 state (rolled from 454 °C to 399 °C and annealed at 343 °C by holding in cooled air), followed by a

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35

Cui, Yanyu, Manjun Zhao, Qingmiao Ding, and Bin Cheng. "Study on Dynamic Evolution and Erosion Characteristics of Cavitation Clouds in Submerged Cavitating Water Jets." Journal of Marine Science and Engineering 12, no. 4 (2024): 641. http://dx.doi.org/10.3390/jmse12040641.

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The dynamic evolution behavior of submerged water jet cavitation clouds was studied by combining experiments and simulation. The formation, development, shedding, and collapsing process of a void cloud was analyzed by high-speed camera technology, and the influence of jet pressure was studied. Cavitation water jet erosion experiments were carried out on AL6061 specimens with standard cylindrical nozzles, and the correlation between cavitation cloud evolution and material erosion was studied by surface analysis. The results showed that the evolution of a cavitation cloud has obvious periodicity

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36

Dong, Jingming, Shuai Li, Rongxuan Meng, Xiao Zhong, and Xinxiang Pan. "Research on Cavitation Characteristics of Two-Throat Nozzle Submerged Jet." Applied Sciences 12, no. 2 (2022): 536. http://dx.doi.org/10.3390/app12020536.

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Анотація:

Ship fouling not only increases ship resistance and fuel consumption but is equally a type of biological invasion, which causes severe ecological damage. Submerged cavitation jet cleaning is an environmentally friendly, high-efficiency, and energy-saving cleaning method. The nozzle structure has an essential influence on the cleaning effect. Thus, a two-throat nozzle was designed for application in submerged cavitation jet cleaning. To investigate the cavitation characteristics of the two-throat nozzle, a high-speed photographic visualization experiment and an erosion experiment concerning the

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37

Aniskovich, E. V., V. V. Moskvichev, and A. P. Chernaev. "Assessment of the residual life of turbine runners with operational defectiveness." Industrial laboratory. Diagnostics of materials 89, no. 6 (2023): 62–75. http://dx.doi.org/10.26896/1028-6861-2023-89-6-62-75.

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Анотація:

The residual life of the runners of hydraulic turbines in the presence of operational defects is estimated. The main problems of the operation of hydraulic turbines associated with technological defects and exhaustion of the standard resource are described. The main requirements for initial data to be used in estimation of the residual resource and the requirements for predicting the residual resource of runners based on the results of surveys and analysis of their technical condition are specified. We have classified and briefly described the applied approaches and techniques used in estimati

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Rakibuzzaman, Md, Hyoung-Ho Kim, Kyungwuk Kim, Sang-Ho Suh, and Kyung Kim. "Numerical Study of Sediment Erosion Analysis in Francis Turbine." Sustainability 11, no. 5 (2019): 1423. http://dx.doi.org/10.3390/su11051423.

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Анотація:

Effective hydraulic turbine design prevents sediment and cavitation erosion from impacting the performance and reliability of the machine. Using computational fluid dynamics (CFD) techniques, this study investigated the performance characteristics of sediment and cavitation erosion on a hydraulic Francis turbine by ANSYS-CFX software. For the erosion rate calculation, the particle trajectory Tabakoff–Grant erosion model was used. To predict the cavitation characteristics, the study’s source term for interphase mass transfer was the Rayleigh–Plesset cavitation model. The experimental data acqui

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39

Yi, Dayun, Liang Lu, Jun Zou, and Xin Fu. "Interactions between poppet vibration and cavitation in relief valve." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 8 (2014): 1447–61. http://dx.doi.org/10.1177/0954406214544304.

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Poppet vibration and cavitation, two representative phenomena in relief valves, are considered as the roots of the violent noise, erosion, and structure damage. In this paper, the interactions between the poppet vibration characteristics and cavitation property in relief valves with the unconfined poppet are investigated experimentally. Tests have been performed in stable and unstable valves under cavitation and noncavitation conditions. The valve housing is fabricated by Perspex for flow visualization. As for the influence of cavitation on vibration characteristics, it is found that the gener

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40

LI, ZHENGWEI, ZHIWU ZU, BO ZHANG, and JIUCHUN YAN. "Cavitation Characteristics in Ultrasonic Soldering and the Erosion Effect." Welding Journal 103, no. 04 (2024): 160–74. http://dx.doi.org/10.29391/2024.103.023.

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In this work, the cavitation characteristics of the solder sonocapillary action during ultrasonic soldering were studied by a high-speed camera. The effects of ultrasonic power and time on the acoustic pressure, cavitation characteristics, and erosion effects were also investigated. Results showed that cavitation occurred throughout the entire sonocapillary action. Two kinds of bubble structures were observed. The steady bubbles had large sizes and long life periods. The transient bubbles had small sizes and short life periods. The steady bubbles preferentially appeared at the primary filling

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41

Svoboda, Dmitry, Evgenii Ivanov, Aleksandr Zharkovskii, and Igor Borshchev. "Calculated and experimental determination of erosion zones in the flow part of the vane type pump." E3S Web of Conferences 121 (2019): 01002. http://dx.doi.org/10.1051/e3sconf/201912101002.

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The results of numerical and experimental investigations aimed at creating a methodology for predicting the erosion characteristics of vane pumps were conducted in this paper. This methodology especially relevant in the case of pumping liquids with physical properties different from water. The methods of computational fluid dynamics (CFD) well predict the operation failure due to cavitation and allow us to determine the areas of possible cavitation erosion. The conditions for the absence of cavitation erosion also could be predicted with the help of CFD methods. In order to verify the numerica

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42

Yang, Junfeng, Pengbo Wu, Guohua Song, Shuaihui Sun, and Kai Wang. "Effect of multiple factors on sediment erosion characteristics of hydro turbine materials." Journal of Physics: Conference Series 2707, no. 1 (2024): 012145. http://dx.doi.org/10.1088/1742-6596/2707/1/012145.

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Abstract Hydraulic turbines on sediment-laden rivers suffer from cavitation-silt erosion. This study conducted cavitation-silt erosion tests on three materials (06Cr16Ni5Mo, Q355B, 06Cr20Ni11) with different sediment concentrations and impact velocities using a rotating disk facility, and used a scanning electron microscope (SEM) to observe the cavitation-silt erosion characteristics of the materials. The results show that the cumulative weight loss of all materials continuously increases with the sediment concentration and impact velocity rises. The weight loss of 06Cr16Ni5Mo is the lowest, a

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43

Li, Haonan, Jiawang Chen, Jin Guo, Hai Zhu, Yuan Lin, and Han Ge. "A Study of Cavitation Erosion in Artificial Submerged Water Jets." Applied Sciences 14, no. 11 (2024): 4804. http://dx.doi.org/10.3390/app14114804.

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The artificially submerged cavitation water jet is effectively utilized by ejecting a high-pressure water stream into a low-pressure water stream through concentric nozzles and utilizing the cavitation phenomenon generated by the shear layer formed between the two streams. In this study, we investigated the cavitation characteristics of artificially submerged cavitation water jets by combining numerical simulations and erosion experiments. The results indicate that an appropriate standoff distance can generate more cavitation clouds on the workpiece surface, and the erosion characteristics of

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44

Szala, Mirosław, and Tadeusz Hejwowski. "Cavitation Erosion Resistance and Wear Mechanism Model of Flame-Sprayed Al2O3-40%TiO2/NiMoAl Cermet Coatings." Coatings 8, no. 7 (2018): 254. http://dx.doi.org/10.3390/coatings8070254.

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Анотація:

This manuscript deals with the cavitation erosion resistance of flame-sprayed Al2O3-40%TiO2/NiMoAl cermet coatings (low-velocity oxy-fuel (LVOF)), a new functional application of cermet coatings. The aim of the study was to investigate the cavitation erosion mechanism and determine the effect of feedstock powder ratio (Al2O3-TiO2/NiMoAl) of LVOF-sprayed cermet coatings on their cavitation erosion resistance. As-sprayed coatings were investigated for roughness, porosity, hardness, and Young’s modulus. Microstructural characteristics of the cross section and the surface of as-sprayed coatings we

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45

Zhang, Jiayun, Zhifeng Yao, Qiang Zhong, Haitao Ren, Ruofu Xiao, and Fujun Wang. "Design of a high-speed cavitation hydrodynamics test system." Journal of Physics: Conference Series 2707, no. 1 (2024): 012153. http://dx.doi.org/10.1088/1742-6596/2707/1/012153.

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Abstract Due to the high sediment content in rivers in China and the relatively high concentration of “gas core” in water, cavitation of hydraulic machinery is likely to occur at high speeds, leading to a series of problems such as reduced efficiency of hydraulic machinery, intensified vibration and material erosion. To carry out the study of cavitation erosion, a test system (hereinafter referred to as the cavitation water tunnel) suitable for the basic study of cavitation dynamics at high velocity is designed in this paper. The whole system includes a circulating loop structure, which mainly

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46

Skyba, M., M. Stechyshyn, V. LIUKHOVETS, N. Stechyshyna, and M. Lukianiuk. "CAVITATION-EROSION WEAR RESISTANCE OF STRUCTURAL STEELS NITRIDED IN A GLOW DISCHARGE." Herald of Khmelnytskyi National University. Technical sciences 281, no. 1 (2020): 249–57. https://doi.org/10.31891/2307-5732-2020-281-1-249-257.

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Cavitation and erosion resistance of structural steels in corrosion-active environments is determined by the physicochemical characteristics of their surfaces. Therefore, surface hardening methods are widely used to increase the cavitation resistance of steels. One of the methods of increasing the cavitation-erosion resistance is the method of anhydrous nitriding in glow discharge (BATR), which in addition to the effective protection of surfaces is environmentally friendly and due to the lack of hydrogen in the saturated gas mixture significantly improves the safety of operation of the plants

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47

Palchenko, O. "CAVITATION EROSION IN FRANCIS TURBINES." Municipal economy of cities 4, no. 185 (2024): 141–46. http://dx.doi.org/10.33042/2522-1809-2024-4-185-141-146.

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Анотація:

The phenomenon of secondary flow is a global problem that causes cavitation erosion in hydraulic equipment. Cavitation is a phenomenon of localised corrosion of the metal surface leading to instability and highly uneven flow behaviour with a consequent excessive noise, vibration, and decreased efficiency in Francis, Kaplan, and other turbines. Both Kaplan and Francis turbines are reaction turbines. Francis turbines (FT) are used worldwide due to their relatively compact design, high efficiency, and operation underwater at heights ranging from 100 to 300 m with an efficiency ranging from 90% to

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48

Liu, Baonan, Mengyao Li, Yuan Yuan, and Jie Liu. "Unified Paradigm of Start-Up Strategy for Pumped Storage Hydropower Stations: Variable Universe Fuzzy PID Controller and Integrated Operation Optimization." Energies 17, no. 13 (2024): 3293. http://dx.doi.org/10.3390/en17133293.

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A pumped storage unit is a crucial guarantee in the pursuit of increased clean energy, especially in the progressively severe circumstances of low energy utilization and poor coordination of the integration of volatile renewable energy. However, due to their bidirectional operation design, pumped turbines possess an S-characteristic attribution, wherein the unsteady phenomena of unit vibration, pressure pulsation, and cavitation erosion happen during the start-up process and greatly impact the stable connection to the power grid. Therefore, a systematic study concentrating on an optimal unifie

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He, Zhi Hua, Yu Ping Wu, Hong Bin Sun, et al. "Cavitation Erosion Characteristics of an Iron-Based Coating Prepared by High Velocity Arc Spraying." Advanced Materials Research 189-193 (February 2011): 523–27. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.523.

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In order to increase cavitation erosion resistance of fluid machinery, an iron-based coating was prepared by high velocity arc spraying (HVAS) on the surface of 1Cr18Ni9Ti stainless steel. The microstructure and performance were investigated respectively by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscope (SEM), Vickers hardness and vibratory cavitation apparatus. The results indicated that the coating had the higher hardness (8.67GPa) and the finer structure than ZG230-450 (1.86GPa) used actual in water conservancy. Compared with ZG230-450, cavitation erosion res

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Cai, Tengfei, Yan Pan, and Fei Ma. "Effects of nozzle lip geometry on the cavitation erosion characteristics of self-excited cavitating waterjet." Experimental Thermal and Fluid Science 117 (September 2020): 110137. http://dx.doi.org/10.1016/j.expthermflusci.2020.110137.

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