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Artykuły w czasopismach na temat „Cavitation”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Romanov, Alexey, Sergey Evdokimov, and Vladimir Seliverstov. "Cavitation research results of hydroturbine impeller blades and their analysis." MATEC Web of Conferences 196 (2018): 02006. http://dx.doi.org/10.1051/matecconf/201819602006.

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Abstract. Cavitation erosion affects the hydropower plants operation mode, destroys the surface of water-conducting way, affects the efficiency coefficient as well as the turbine output. The most common damage is observed on water-conducting ways having poor streamline shape, various ledges, irregularities along the water flow. Disruptive cavitations are formed initially on the rotation axes of vortexes, and the caverns of disruptive cavitation develop with the period subordinating the Strouhal Law. One of the methods of cavitational erosion field studies is the method of obtaining high-speed

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Viitanen, Ville M., Tuomas Sipilä, Antonio Sánchez-Caja, and Timo Siikonen. "Compressible Two-Phase Viscous Flow Investigations of Cavitation Dynamics for the ITTC Standard Cavitator." Applied Sciences 10, no. 19 (2020): 6985. http://dx.doi.org/10.3390/app10196985.

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In this paper, the ITTC Standard Cavitator is numerically investigated in a cavitation tunnel. Simulations at different cavitation numbers are compared against experiments conducted in the cavitation tunnel of SVA Potsdam. The focus is placed on the numerical prediction of sheet-cavitation dynamics and the analysis of transient phenomena. A compressible two-phase flow model is used for the flow solution, and two turbulence closures are employed: a two-equation unsteady RANS model, and a hybrid RANS/LES model. A homogeneous mixture model is used for the two phases. Detailed analysis of the cavi

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3

Hu, Xiao, and Ye Gao. "Investigation of the Disk Cavitator Cavitating Flow Characteristics under Relatively High Cavitation Number." Applied Mechanics and Materials 29-32 (August 2010): 2555–62. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.2555.

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Simulations on two-phase cavitating flows containing water and vapor, on axisymmetric body with disk cavitator have been implemented through the cavitation model in Fluent 6.2, the flow field around cavitator under different incoming conditions is studied respectively, and analyses to parameters pertinent to cavity including dimension, streamlines, vapor volume fractions and pressure distributions along the body surface are given when the incoming cavitation number ranges from 0.3 to 0.8, the results show that the vapor volume fraction and threshold phase-change pressure within the cavity unde

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Pandit, Aniruddha B., Manisha V. Bagal, and Parag R. Gogate. "What Chemical Engineers Can Learn from Shrimp." Annual Review of Chemical and Biomolecular Engineering 16, no. 1 (2025): 433–53. https://doi.org/10.1146/annurev-chembioeng-082223-102200.

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This review focuses on how the cavitation mechanism in the snapping shrimp can be explored to intensify various chemical engineering applications. Effective bubble collapse can lead to hot spot formation, increased transport coefficients (momentum, heat, and mass), and enhanced interfacial area and also results in the formation of highly reactive radicals. Cavitation's ability to induce rapid micromixing, enhance mass transfer, and facilitate nucleophilic chemical reactions can find applications in various industries. An overview of cavitation applications, reactors used for cavitation, effect

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5

Soyama, Hitoshi. "Cavitating Jet: A Review." Applied Sciences 10, no. 20 (2020): 7280. http://dx.doi.org/10.3390/app10207280.

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When a high-speed water jet is injected into water through a nozzle, cavitation is generated in the nozzle and/or shear layer around the jet. A jet with cavitation is called a “cavitating jet”. When the cavitating jet is injected into a surface, cavitation is collapsed, producing impacts. Although cavitation impacts are harmful to hydraulic machinery, impacts produced by cavitating jets are utilized for cleaning, drilling and cavitation peening, which is a mechanical surface treatment to improve the fatigue strength of metallic materials in the same way as shot peening. When a cavitating jet i

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6

Wang, Hao, Jian Feng, Keyang Liu, et al. "Experimental Study on Unsteady Cavitating Flow and Its Instability in Liquid Rocket Engine Inducer." Journal of Marine Science and Engineering 10, no. 6 (2022): 806. http://dx.doi.org/10.3390/jmse10060806.

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To study instability in the unsteady cavitating flow in a liquid rocket engine inducer, visualization experiments of non-cavitating and cavitating flows inside a model inducer were carried out at different flow conditions. Visual experiments were carried out to capture the evolution of non-cavitating and cavitating flows in a three-bladed inducer by using a high-speed camera. The external characteristic performance, cavitation performance, and pressure pulsation were analyzed based on the observation of non-cavitation and cavitation development and their instabilities. Under non-cavitation con

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7

Qi, Xiaobin, Fangchao Xia, Jiawen Wang, and Huan Liu. "Research on the influence of cavitator configuration on the cavitation flow characteristics around projectiles." Journal of Physics: Conference Series 2891, no. 9 (2024): 092030. https://doi.org/10.1088/1742-6596/2891/9/092030.

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Abstract In order to optimize the projectile head shape, numerical simulations were conducted on the cavitation flow field of different cavitator configurations, including inverted trapezium, hemispherical, and cylindrical cavitator configurations. The results indicate that under the same cavitation number, the inverted trapezium cavitator produces the largest cavitation profile and is more prone to cavitation generation. Cylindrical cavitator come in second place, while hemispherical cavitator are less prone to cavitation. The turbulent kinetic energy is closely related to the generation of c

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8

Liu, Qian Kun, and Ye Gao. "Numerical Simulation of Natural Cavitating Flow over Axisymmetric Bodies." Applied Mechanics and Materials 226-228 (November 2012): 825–30. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.825.

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The hydrodynamic characteristics of bodies are greatly affected by cavitation. Coupling with natural cavitaion model, a multiphase CFD method is developed and is employed to simulate supercavitating and partial cavitating flows over axisymmetric bodies using FLUENT 6.2. The results of supercavitation of a disk cavitator agree well with the boundary element method (BEM), the analytical relations and available experimental results. The present computations and the BEM results are compared with experiments for partial cavitating flows over three typical axisymmetric bodies and the results are dis

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9

Lee, Insu, Sunho Park, Woochan Seok, and Shin Hyung Rhee. "A Study on the Cavitation Model for the Cavitating Flow Analysis around the Marine Propeller." Mathematical Problems in Engineering 2021 (June 17, 2021): 1–8. http://dx.doi.org/10.1155/2021/2423784.

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In this study, a cavitation model for propeller analysis was selected using computational fluid dynamics (CFD), and the model was applied to the cavitating flow around the Potsdam Propeller Test Case (PPTC) propeller. The cavitating flow around the NACA 66 hydrofoil was analyzed to select a cavitation model suitable for propeller analysis among various cavitation models. The present and the experimental results were compared to select a cavitation model that would be applied to propeller cavitation analysis. Although the CFD results using the selected cavitation model showed limitations in est

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10

Xu, Gaowei, Huimin Fang, Yumin Song, and Wensheng Du. "Optimal Design and Analysis of Cavitating Law for Well-Cellar Cavitating Mechanism Based on MBD-DEM Bidirectional Coupling Model." Agriculture 13, no. 1 (2023): 142. http://dx.doi.org/10.3390/agriculture13010142.

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A variable velocity parallel four-bar cavitating mechanism for well-cellar can form the well-cellar cavitation which suits for well-cellar transplanting under a continuous operation. In order to improve the cavitating quality, this paper analyzed the structural composition and working principle of the cavitating mechanism and established the bidirectional coupling model of multi-body dynamics and the discrete element between the cavitating mechanism and soil through Recurdyn and EDEM software. Based on the model, a three-factor, five-level quadratic orthogonal rotational combination design tes

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11

Cui, Baoling, and Jie Chen. "Visual experiment and numerical simulation of cavitation instability in a high-speed inducer." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 4 (2019): 470–80. http://dx.doi.org/10.1177/0957650919867173.

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Cavitation instabilities in a high-speed inducer at a design flow rate were investigated for different cavitation numbers in numerical simulations and visual experiments. On the basis of a shear stress transport k–ω turbulence model and Zwart–Gerber–Belamri cavitation model, the transient cavitating flow in a high-speed centrifugal pump with an inducer is numerically simulated using ANSYS-CFX 15.0 software. Visual experiments were carried out to capture the evolution of cavitating flow in the inducer by using a high-speed camera. The performance and cavitation characteristic curves from numeri

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12

ZHANG, YAO, XIANWU LUO, SHUHONG LIU, and HONGYUAN XU. "A TRANSPORT EQUATION MODEL FOR SIMULATING CAVITATION FLOWS IN MINIATURE MACHINES." Modern Physics Letters B 24, no. 13 (2010): 1467–70. http://dx.doi.org/10.1142/s0217984910023888.

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A new transport equation model is proposed for simulating cavitating flows in miniature machines. In the developed model, the surface tension, viscous force, and thermal effect of cavitation are considered to reflect their influence on the cavitation bubble growth. The cavitating flow in a miniature pump is calculated by applying the proposed cavitation model. The comparison between numerical results and experimental data indicates that the new cavitation model is applicable for simulating the cavitating flow in miniature machines.

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13

Zhang, Haida, Chenxing Fan, Luyao Wang, Wenjun Lu, and Deng Li. "The Generation Methods and Applications of Cavitating Jet by Using Bubble Collapse Energy." Energies 17, no. 23 (2024): 5902. http://dx.doi.org/10.3390/en17235902.

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Cavitation is a dynamic process characterized by the formation, growth, and collapse of vapor or gas vacuoles in liquids or at the liquid–solid interface, initiated by a local pressure drop. This phenomenon releases concentrated energy through microjet impacts and shock waves, leading to a violent exchange of energy with the surrounding environment. While cavitation is often perceived as detrimental, certain aspects can be harnessed for practical applications. Relevant studies have shown that cavitating jets provide high operating efficiencies, reduce energy consumption per unit, and have the

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14

Lin, Yuxing, Ebrahim Kadivar, and Ould el Moctar. "Experimental Study of the Cavitation Effects on Hydrodynamic Behavior of a Circular Cylinder at Different Cavitation Regimes." Fluids 8, no. 6 (2023): 162. http://dx.doi.org/10.3390/fluids8060162.

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In this work, we experimentally investigated the cavitation effects on the hydrodynamic behavior of a circular cylinder at different cavitating flows. We analyzed the cavitation dynamics behind the circular cylinder using a high-speed camera and also measured the associated hydrodynamic forces on the circular cylinder using a load cell. We studied the cavitation dynamics around the cylinder at various types of the cavitating regimes such as cloud cavitation, partial cavitation and cavitation inception. In addition, we analyzed the cavitation dynamics at three different Reynolds numbers: 1 × 10

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15

Cai, Cindy X., John Choong, Sina Farsiu, Stephanie J. Chiu, Emily Y. Chew, and Glenn J. Jaffe. "Retinal cavitations in macular telangiectasia type 2 (MacTel): longitudinal structure–function correlations." British Journal of Ophthalmology 105, no. 1 (2020): 109–12. http://dx.doi.org/10.1136/bjophthalmol-2019-315416.

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Background/aimsTo quantify retinal cavitation size over time in macular telangiectasia type 2 (MacTel) and to correlate changes with visual acuity and area of ellipsoid zone loss.MethodsOptical coherence tomography (OCT) macula volume scans from sham eyes included in a prospective, phase II clinical trial of human ciliary neutrophic factor for MacTel at baseline, 1 year and 2 years of follow-up were analysed. Cavitations were segmented by two independent readers. Total cavitation volume was compared with area of ellipsoid zone loss and best-corrected visual acuity (BCVA).ResultsFifty-one eyes

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16

Dolgopolov, S. I. "Determining the coefficients of a hydrodynamic model of cavitating pumps of liquid-propellant rocket engines from their theoretical transfer matrices." Technical mechanics 2024, no. 1 (2024): 16–25. http://dx.doi.org/10.15407/itm2024.01.016.

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The characterization of cavitating pumps of liquid-propellant rocket engines (LPRE) is an important problem because of the need to provide the pogo stability of liquid-propellant launch vehicles and the stability of liquid-propellant propulsion systems for cavitation oscillations. The development of a reliable mathematical model of LPRE cavitating pumps allows this problem to be resolved. The goal of this work is to determine the cavitation number and operating parameter dependences of the coefficients of a lumped-parameter hydrodynamic model of LPRE cavitating pumps from their theoretical tra

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17

Lu, L., J. Zou, X. Fu, et al. "Cavitating flow in non-circular opening spool valves with U-grooves." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 10 (2009): 2297–307. http://dx.doi.org/10.1243/09544062jmes1504.

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Cavitating flow in non-circular opening spool valves with U-grooves has been investigated in this article. Multifarious cavitating properties, including acoustic cavitation, morphologic cavitation, and discharge performance with cavitation, are investigated, the correlations of which are discussed. The critical opening condition in each valve is obtained based on the analysis of a throttling model. It is found that the cavitating properties show remarkable differences in the two situations when the opening is larger and smaller than the critical opening. Additionally, cavitation impacts on the

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18

Shen, Xi, Haoran Wu, Gang Yang, et al. "Experimental Study on the Classification and Evolution of the Tip Cavitation Morphology in Axial Waterjet Pumps with Two Different Blade Numbers." Journal of Marine Science and Engineering 12, no. 11 (2024): 1898. http://dx.doi.org/10.3390/jmse12111898.

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Tip leakage flow and induced unstable cavitation can significantly damage the performance of axial waterjet pumps. This study investigated the impact of blade numbers on cavitating conditions in an axial waterjet pump by conducting tests of performance characteristics and high-speed photography experiments on three-blade and four-blade impellers. The results showed that the critical cavitation number σc of the three-blade impeller was larger, while the four-blade impeller flow pattern deteriorated more rapidly after σc. Various cavitation structures in the tip region were observed under differ

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19

Gao, Bo, Pengming Guo, Ning Zhang, Zhong Li, and Minguan Yang. "Experimental Investigation on Cavitating Flow Induced Vibration Characteristics of a Low Specific Speed Centrifugal Pump." Shock and Vibration 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/6568930.

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Cavitating flow developing in the blade channels is detrimental to the stable operation of centrifugal pumps, so it is essential to detect cavitation and avoid the unexpected results. The present paper concentrates on cavitation induced vibration characteristics, and special attention is laid on vibration energy in low frequency band, 10–500 Hz. The correlation between cavitating evolution and the corresponding vibration energy in 10–500 Hz frequency band is discussed through visualization analysis. Results show that the varying trend of vibration energy in low frequency band is unique compare

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20

Zhao, Wei Guo, Xiao Xia He, Xiu Yong Wang, and Yi Bin Li. "Numerical Simulation of Cavitation Flow in a Centrifugal Pump." Applied Mechanics and Materials 444-445 (October 2013): 509–16. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.509.

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Based on two phase homogeneous mixture model, numerical simulation of the cavitating flow was performed on a centrifugal pump. Cavity shapes and performance of the pump in variable cavitation numbers were obtained. Numerical results show that the numerical method can be used to predict the cavitation performance of centrifugal pump; the incipient cavitation number is predicted, and the cavity shape is similar with the experiment; cavitation usually appears in the suction surface of the blade and locates in the inlet side, and becomes longer to the outlet direction with lower cavitation number;

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KHOO, B. C., and J. G. ZHENG. "THE NUMERICAL SIMULATION OF UNSTEADY CAVITATION EVOLUTION INDUCED BY PRESSURE WAVE." International Journal of Modern Physics: Conference Series 34 (January 2014): 1460374. http://dx.doi.org/10.1142/s2010194514603743.

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The present study is focused on the numerical simulation of pressure wave propagation through the cavitating compressible liquid flow, its interaction with cavitation bubble and the resulting unsteady cavitation evolution. The compressibility effects of liquid water are taken into account and the cavitating flow is governed by one-fluid cavitation model which is based on the compressible Euler equations with the assumption that the cavitation is the homogeneous mixture of liquid and vapour which are locally under both kinetic and thermodynamic equilibrium. Several aspects of the method employe

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Huang, D. G., and Y. Q. Zhuang. "Temperature and cavitation." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 2 (2008): 207–11. http://dx.doi.org/10.1243/09544062jmes815.

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Pressure, density, and temperature are the fundamental thermodynamic parameters. In a liquid flow field, once the local pressure drops to the saturated pressure, the liquid vapourizes and local cavitation occurs. The cavitation region of the flow is characterized by a mixture of liquid and vapour. Vapourization is an endothermic process. However, in the literature of the past several decades, this vapourization induced thermal effect was sometimes ignored in cavitating flows, and the temperature was always assumed as a constant in the whole flow field. In order to gain a deep insight into the

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23

Soyama, Hitoshi, and Mitsuhiro Mikami. "Improvement of Fatigue Strength of Stainless Steel by Using a Cavitating Jet with an Associated Water Jet in Water." Key Engineering Materials 353-358 (September 2007): 162–65. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.162.

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Peening method using cavitation impacts have been developed. In this peening method, cavitation bubbles were generated by a cavitating jet. In order to increase peening intensity, a low speed water jet was injected around a cavitating jet, as the water jet swept away residual bubbles, which weaken the cavitation impact. In the present paper, improvement of fatigue strength of stainless steel by using a cavitating jet with an associated water jet was investigated compared with the results of conventional cavitating jet. It was concluded that the cavitating jet with an associated water jet can p

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Zhang, Hu, Jun Wang, Desheng Zhang, Weidong Shi, and Jianbo Zang. "Numerical Analysis of the Effect of Cavitation on the Tip Leakage Vortex in an Axial-Flow Pump." Journal of Marine Science and Engineering 9, no. 7 (2021): 775. http://dx.doi.org/10.3390/jmse9070775.

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To understand the effect of cavitation on the tip leakage vortex (TLV), turbulent cavitating flows were numerically investigated using the shear-stress transport (SST) k–ω turbulence model and the Zwart–Gerber–Belamri cavitation model. In this work, two computations were performed—one without cavitation and the other with cavitation—by changing the inlet pressure of the pump. The results showed that cavitation had little effect on the pressure difference between the blade surfaces for a certain cavitation number. Instead, it changed the clearance flow and TLV vortex structure. Cavitation cause

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Hong, Feng, Jianping Yuan, Banglun Zhou, and Zhong Li. "Modeling of unsteady structure of sheet/cloud cavitation around a two-dimensional stationary hydrofoil." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 231, no. 3 (2015): 455–69. http://dx.doi.org/10.1177/0954408915607390.

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Compared to non-cavitating flow, cavitating flow is much complex owing to the numerical difficulties caused by cavity generation and collapse. In the present work, cavitating flow around a two-dimensional Clark-Y hydrofoil is studied numerically with particular emphasis on understanding the cavitation structures and the shedding dynamics. A cavitation model, coupled with the mixture multi-phase approach, and the modified shear stress transport k-ω turbulence model has been developed and implemented in this study to calculate the pressure, velocity, and vapor volume fraction of the hydrofoil. T

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Li, Tao, Bin Liu, Jinzhi Zhou, Wenxuan Xi, Xiulan Huai, and Hang Zhang. "A Comparative Study of Cavitation Characteristics of Nano-Fluid and Deionized Water in Micro-Channels." Micromachines 11, no. 3 (2020): 310. http://dx.doi.org/10.3390/mi11030310.

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Hydrodynamic cavitation has been widely applied in micro-fluidic systems. Cavitating flow characteristics are closely related to the fluid properties. In this paper, the cavitation characteristics of Cu nano-fluid in micro-channels were numerically investigated and compared with those of the deionized (DI) water. The mathematical model was verified by comparing the numerical results with the experiment observation. The curved orifice (R = 0.3 mm) was found to have the highest efficiencies of cavitation for both fluids. With the increase of inlet pressure, cavitating jet lengths of the two flui

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Wei, Aibo, Shunhao Wang, Xu Gao, Limin Qiu, Lianyan Yu, and Xiaobin Zhang. "Investigation of unsteady cryogenic cavitating flow and induced noise around a three-dimensional hydrofoil." Physics of Fluids 34, no. 4 (2022): 042120. http://dx.doi.org/10.1063/5.0088092.

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In this paper, the Large Eddy Simulation (LES) combined with the Schnerr–Sauer cavitation model and the permeable Ffowcs Williams–Hawkings (FW-Hpds) acoustic analogy approach are introduced to study the unsteady cavitation behaviors and the radiated noise characteristics of the transient liquid nitrogen (LN2) cavitating flow around a NACA66 (National Advisory Committee for Aeronautics) hydrofoil. Satisfactory agreement is obtained between the numerical predictions and experimental measurements. The cavitation noise is predicted based on the sound radiation theory for spherical bubbles and comp

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Dolgopolov, S. I. "Verification of a hydrodynamic model of a liquid-propellant rocket engine’s cavitating pumps using experimental and theoretical pump transfer matrices." Technical mechanics 2020, no. 3 (2020): 18–29. http://dx.doi.org/10.15407/itm2020.03.018.

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Cavities at the pump inlet may lead to inadmissible cavitation self-oscillations in the feed system of liquid-propellant rocket engines (LPREs) and to POGO instability if the oscillation frequency of the liquid is close to that of the rocket structure. Because of this, it is important to prevent both cavitation and POGO oscillations as early as at the engine and rocket design stage. This calls for a reliable mathematical model of the dynamics of LPRE cavitating pumps. In this paper, a hydrodynamic model of LPRE cavitating pumps is verified using theoretical and experimental transfer matrices o

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Li, Hong, Zhenhua Shen, Nicholas Engen Pedersen, and Christian Brix Jacobsen. "Experimental and unsteady numerical research of a high-specific-speed pump for part-load cavitation instability." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401982893. http://dx.doi.org/10.1177/1687814019828932.

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Net positive suction head peak is a well-known cavitation instability phenomenon in high-specific-speed pumps. Both non-cavitating performance and cavitating performance of a high-specific-speed pump were investigated by experiments and numerical simulations. According to the cavitating performance results, net positive suction head peak is found at 80% of nominal flow. The head curves of non-cavitating performance also have saddle-type instabilities near 70%–80% of nominal flow. Water vapor volume fraction distributions show that cavitation region at net positive suction head peak flow only c

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Amromin, E. L. "STATE-OF-THE ART IN COMPUTATIONAL ANALYSIS OF CAVITATION INCEPTION AND ITS SCALE EFFECTS." International Journal of Maritime Engineering 164, A4 (2023): 385–96. http://dx.doi.org/10.5750/ijme.v164ia4.814.

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Mathematical analysis of cavitation inception is an important topic for naval engineering, but several circumstances make it difficult. First, cavitating flows are substantially multi-zone flows, where the appearing cavities are incomparably smaller than a cavitating body is. Second, inception is substantially influenced by characteristics of the inflow and of the body surfaces. Third, validation of employed mathematical methods by comparison with experimental data is a non-trivial task because of the complexity of experiments themselves and scale effects. This paper is emphasized on multi-zon

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Jasionowski, R., W. Polkowski, and D. Zasada. "Destruction Mechanism of ZnAl4 as Cast Alloy Subjected to Cavitational Erosion Using Different Laboratory Stands." Archives of Foundry Engineering 16, no. 1 (2016): 19–24. http://dx.doi.org/10.1515/afe-2015-0096.

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Abstract The main reason of a cavitational destruction is the mechanical action of cavitation pulses onto the material’s surface. The course of cavitation destruction process is very complex and depends on the physicochemical and structural features of a material. A resistance to cavitation destruction of the material increases with the increase of its mechanical strength, fatigue resistance as well as hardness. Nevertheless, the effect of structural features on the material’s cavitational resistance has been not fully clarified. In the present paper, the cavitation destruction of ZnAl4 as cas

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Rhee, Shin Hyung, Takafumi Kawamura, and Huiying Li. "Propeller Cavitation Study Using an Unstructured Grid Based Navier-Stoker Solver." Journal of Fluids Engineering 127, no. 5 (2005): 986–94. http://dx.doi.org/10.1115/1.1989370.

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The cavitating flow around a marine propeller is studied using an unstructured grid based Reynolds-averaged Navier-Stokes computational fluid dynamics method. A cavitation model based on a single-fluid multi-phase flow method is implemented in the Navier-Stokes solver. The proposed computational approach for cavitation is validated against a benchmark database for a cavitating hydrofoil as well as measured data for a cavitating marine propeller. The leading edge and mid-chord cavitation on the hydrofoil is reproduced well and shows good comparison with the well-known experimental data. The pre

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Soyama, Hitoshi. "High-Speed Observation of a Cavitating Jet in Air." Journal of Fluids Engineering 127, no. 6 (2005): 1095–101. http://dx.doi.org/10.1115/1.2060737.

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The use of cavitation impact is a practical method for improving the fatigue strength of metals in the same way as shot peening. In the case of peening using cavitation impact, cavitation is produced by a high-speed submerged water jet with cavitation, i.e., a cavitating jet. A cavitating jet in air was successfully generated by injecting a high-speed water jet into a low-speed water jet injected into air using a concentric nozzle. In order to investigate the various appearances of cavitating jets in air, an observation was carried out using high-speed photography and high-speed video recordin

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Soyama, H., J. D. Park, and M. Saka. "Use of Cavitating Jet for Introducing Compressive Residual Stress." Journal of Manufacturing Science and Engineering 122, no. 1 (1999): 83–89. http://dx.doi.org/10.1115/1.538911.

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In an attempt to strengthen the surface of materials, the potential of using a cavitating jet to form compressive residual stress has been investigated. Introducing compressive residual stress to a material surface provides improvement of the fatigue strength and resistance to stress corrosion cracking. In general, cavitation causes damage to hydraulic machinery. However, cavitation impact can be used to form compressive residual stress in the same way as shot peening. In the initial stage, when cavitation erosion progresses, only plastic deformation, without mass loss, takes place on the mate

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Jasionowski, Robert, Dariusz Zasada, and Wojciech Polkowski. "The Evaluation of the Cavitational Damage in MgAl2Si Alloy Using Various Laboratory Stands." Solid State Phenomena 252 (July 2016): 61–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.252.61.

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Evaluation of cavitation erosion resistance of is carried out by using various testing stands, that differ by the way of cavitation excitation and its intensity. These various testing conditions have led to a standardization of some part of laboratory stands, that in turn allows a direct comparison of results obtained in different laboratories. The aim of this study was to determine the course of cavitational destruction of MgAl2Si alloy samples tested on three different laboratory stands. The research was conducted on a vibration stand according to ASTM G32, where cavitation is forced by the

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Zhang, De-Sheng, Hai-Yu Wang, Lin-Lin Geng, and Wei-Dong Shi. "Detached eddy simulation of unsteady cavitation and pressure fluctuation around 3-D NACA66 hydrofoil." Thermal Science 19, no. 4 (2015): 1231–34. http://dx.doi.org/10.2298/tsci1504231z.

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The unsteady cavitating flow and pressure fluctuation around the 3-D NACA66 hydrofoil were simulated and validated based on detached eddy simulation turbulence model and a homogeneous cavitation model. Numerical results show that detached eddy simulation can predict the evolution of cavity inception, sheet cavitation growth, cloud cavitation shedding, and breakup, as well as the pressure fluctuation on the surface of hydrofoil. The sheet cavitation growth, detachment, cloud cavitation shedding are responsible for the features of the pressure fluctuation.

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Wang, Zhe, Ruizhi Zhang, Jiajian Zhou, and Xianwu Luo. "Cavitating flow investigation in low specific speed axial flow waterjet pumps." Journal of Physics: Conference Series 2217, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2217/1/012008.

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Abstract In this paper, the cavitating flow in low specific speed axial flow waterjet pumps are treated at different cavitation conditions. In order to analyze the cavitating turbulent flow comprehensively, three axial flow waterjet pumps with the specific speed less than 650 min-1·m3s-1·m are chosen to compare the internal flow phenomenon. The investigations are conducted by numerical simulation, where RANS method is applied with k-ω SST turbulence model and homogeneous cavitation model. The results show that there are several types of cavitation such as tip leakage vortex cavitation, sheet c

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Laborde, R., P. Chantrel, and M. Mory. "Tip Clearance and Tip Vortex Cavitation in an Axial Flow Pump." Journal of Fluids Engineering 119, no. 3 (1997): 680–85. http://dx.doi.org/10.1115/1.2819298.

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A combined study of tip clearance and tip vortex cavitations in a pump-type rotating machine is presented. Cavitation patterns are observed and cavitation inception is determined for various gap heights, clearance and blade geometries, and rotor operating conditions. An optimum clearance geometry is seen to eliminate clearance cavitation when the clearance edge is rounded on the blade pressure side. The gap height has a strong effect on clearance cavitation inception, but the trends vary considerably when other parameters are also modified. The gap height and clearance geometry have less influ

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Major Md. Nur-E-Mostafa, Eare Md Morshed Alam, and Mohammad Monir Uddin. "Numerical Analysis of Cavitating Flow on Hydrofoil." MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY 10 (December 29, 2022): 11–19. http://dx.doi.org/10.47981/j.mijst.10(03)2022.351(11-19).

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Numerical study is presented in this work for turbulent cavitating flow pattern simulation on a hydrofoil, using state equation of cavitation model along with combined turbulence model for mixed fluid based on commercial software FLUENT 6.0. This solver is based on finite volume method. Cavitating study yield irregular behavior with the variation of cavitation values ( . This study is focused on pressure variation, vapor volume fraction, lift and drag forces on the foil section for various cavitation values at angle of attack. Cavitation initiation begins at the foremost surface and covers tow

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Macodiyo, D. O., H. Soyama, and Masumi Saka. "Effect of Cavitation Number on the Improvement of Fatigue Strength of Carburized Steel Using Cavitation Shotless Peening." Key Engineering Materials 261-263 (April 2004): 1245–50. http://dx.doi.org/10.4028/www.scientific.net/kem.261-263.1245.

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Peening can be used to produce a layer of compressive residual stress at the surface of components which are subject to fatigue or stress corrosion, thereby retarding crack initiation and/or impeding the development of new cracks and hence improving their fatigue life. We have developed a new peening method, Cavitation Shotless Peening (CSP), which makes use of cavitation impacts induced by the collapse of the cavitation bubbles to produce compressive residual stress and work hardening on the material surface. CSP is a surface enhancement technique which differs with shot peening in that shots

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Podnar, Andrej, Marko Hočevar, Lovrenc Novak, and Matevž Dular. "Analysis of Bulb Turbine Hydrofoil Cavitation." Applied Sciences 11, no. 6 (2021): 2639. http://dx.doi.org/10.3390/app11062639.

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The influence of a bulb runner blade hydrofoil shape on flow characteristics around the blade was studied. Experimental work was performed on a bulb turbine measuring station and a single hydrofoil in a cavitating tunnel. In the cavitation tunnel, flow visualization was performed on the hydrofoil’s suction side. Cavitation structures were observed for several cavitation numbers. Cavitation was less intense on the modified hydrofoil than on the original hydrofoil, delaying the cavitation onset by several tenths in cavitation number. The results of the visualization in the cavitation tunnel show

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Xing, Tao, Zhenyin Li, and Steven H. Frankel. "Numerical Simulation of Vortex Cavitation in a Three-Dimensional Submerged Transitional Jet." Journal of Fluids Engineering 127, no. 4 (2005): 714–25. http://dx.doi.org/10.1115/1.1976742.

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Vortex cavitation in a submerged transitional jet is studied with unsteady three-dimensional direct numerical simulations. A locally homogeneous cavitation model that accounts for non-linear bubble dynamics and bubble/bubble interactions within spherical bubble clusters is employed. The velocity, vorticity, and pressure fields are compared for both cavitating and noncavitating jets. It is found that cavitation occurs in the cores of the primary vortical structures, distorting and breaking up the vortex ring into several sections. The velocity and transverse vorticity in the cavitating regions

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Klenow, B., and A. Brown. "Prevention of Pressure Oscillations in Modeling a Cavitating Acoustic Fluid." Shock and Vibration 17, no. 2 (2010): 137–59. http://dx.doi.org/10.1155/2010/904390.

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Cavitation effects play an important role in the UNDEX loading of a structure. For far-field UNDEX, the structural loading is affected by the formation of local and bulk cavitation regions, and the pressure pulses resulting from the closure of the cavitation regions. A common approach to numerically modeling cavitation in far-field underwater explosions is Cavitating Acoustic Finite Elements (CAFE) and more recently Cavitating Acoustic Spectral Elements (CASE). Treatment of cavitation in this manner causes spurious pressure oscillations which must be treated by a numerical damping scheme. The

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Son, Min, Michael Börner, Wolfgang Armbruster, and Justin S. Hardi. "Orifice Flow Dynamics in a Rocket Injector as an Excitation Source of Injector-Driven Combustion Instabilities." Aerospace 10, no. 5 (2023): 452. http://dx.doi.org/10.3390/aerospace10050452.

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To investigate a hypothesis of the orifice flow-induced instability in rocket engine thrust chambers, a single liquid oxygen (LOX) injector with an optically accessible orifice module was used for experiments, with water as a simulant for LOX. The unsteady pressure downstream of the orifice was measured using high-speed piezoelectric sensors under cavitating and non-cavitating intra-injector flow conditions. The cavitating orifice flows were directly visualized via backlight imaging with a high-speed camera through the optically accessible orifice module. Cavitation initiated at the cavitation

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Szantyr, J., P. Flaszyński, K. Tesch, W. Suchecki, and S. Alabrudziński. "An Experimental and Numerical Study of Tip Vortex Cavitation." Polish Maritime Research 18, no. 4 (2011): 14–22. http://dx.doi.org/10.2478/v10012-011-0021-z.

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An Experimental and Numerical Study of Tip Vortex Cavitation The article presents the results of the research project concerning tip vortex cavitation. This form of cavitation is very important in operation of many types of rotary hydraulic machines, including pumps, turbines and marine propellers. Tip vortex cavitation generates noise, vibration and erosion. It should be eliminated or significantly limited during the design of these types of machines. The objective of the project was to develop an accurate and reliable method for numerical prediction of tip vortex cavitation, which could serv

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Orekhov, Genrikh. "Cavitation in swirling flows of hydraulic spillways." E3S Web of Conferences 91 (2019): 07022. http://dx.doi.org/10.1051/e3sconf/20199107022.

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During operation of high-head hydraulic spillway systems, cavitation phenomena often occur, leading to destruction of structural elements of their flow conductor portions. The article is devoted to the study of erosion due to cavitation in the circulation flows of eddy hydraulic spillways, including those equipped with counter-vortex flow energy dissipators. Cavitation destructive effects depend on many factors: intensity consisting in the rate of decrease in the volume or mass of a cavitating body per unit of time, the stage of cavitation, geometric configuration of the streamlined body, the

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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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Yang, Yongfei, Gaowei Wang, Weidong Shi, Wei Li, Leilei Ji, and Hongliang Wang. "Turbulence Characteristics in the Mixing Layer of a Submerged Cavitating Jet at High Reynolds Numbers." Sustainability 14, no. 19 (2022): 11963. http://dx.doi.org/10.3390/su141911963.

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In this paper, unsteady and time-averaged turbulence characteristics in a submerged cavitating jet with a high Reynolds number are studied using large eddy simulation. The simulation is validated by comparing the vapor distribution using CFD and a high-speed photography experiment. The results indicate that the currently used numerical method can predict the evolution of the cavitation cloud in the jet accurately. The instantaneous and time-averaged flow fields of the submerged jet with three different cavitation numbers are studied. Comparing the frequency spectral of jets with different cavi

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Hatzissawidis, G., L. Kerres, G. J. Ludwig, and P. F. Pelz. "Spatiotemporal analysis of sheet and cloud cavitation and its damage potential." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012046. http://dx.doi.org/10.1088/1755-1315/1079/1/012046.

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Abstract The cavitation regime has a substantial influence on the damage potential, thus it has to be considered in any specific investigation. For this purpose, we set up a test rig at the Technische Universität Darmstadt using a Circular Leading Edge hydrofoil (CLE) to analyse the damage potential of sheet and cloud cavitation. Exceeding a critical Reynolds number Re c, the cavitation regime transitions from harmless sheet cavitation to aggressive cloud cavitation. High-speed recordings of the cavitation regime are correlated with high frequency pressure data from a wall-mounted piezoelectri

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Zhang, Feng Hua, Nian Li, and Chuan Lin Tang. "Design of Choking Cavitator and its Feasibility Study in Wastewater Treatment." Applied Mechanics and Materials 535 (February 2014): 298–308. http://dx.doi.org/10.4028/www.scientific.net/amm.535.298.

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A new cavitator-choking cavitator is designed on the basis of analyzing the choking cavitation phenomena that occurs in gas-liquid mixed flow of straight pipe ,in jet pump under operating limits and in steady adiabatic flashing flow of stepped circular tube as well as in a cylindrical pipe with a sharp edged-corner for the steady and unsteady flows. The feasibility preliminary research of choking cavitator is carried out with analysis the signals of cavitation noise and treating simulated wastewater (phenol solution). The results offers a new approach in cavitator development field at home and

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