Cavitation flow and broadband noise source characteristics of NACA66 hydrofoil with a V groove on the suction surface

Jia, Jiahao; Zhang, J; Huang, Zhenwei

doi:10.1016/j.oceaneng.2022.112889

Cited by 27 publications

(3 citation statements)

References 39 publications

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“…Jia et al [83] The implementation of POD theory analyzed the cavitating flow around the NACA0015 hydrofoil, delving into the fundamental mechanisms of the hydrofoil's reattachment jet behavior and pressure gradient mechanism.…”

Section: Hydrofoilmentioning

confidence: 99%

Data-Driven Modal Decomposition Methods as Feature Detection Techniques for Flow Fields in Hydraulic Machinery: A Mini Review

Xu,

Zhang,

Zhang

et al. 2024

JMSE

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Cavitation is a quasi-periodic process, and its non-stationarity leads to increasingly complex flow field structures. On the other hand, characterizing the flow field with greater precision has become increasingly feasible. However, accurately and effectively extracting the most representative vibration modes and spatial structures from these vast amounts of data has become a significant challenge. Researchers have proposed data-driven modal decomposition techniques to extract flow field information, which have been widely applied in various fields such as signal processing and fluid dynamics. This paper addresses the application of modal decomposition methods, such as dynamic mode decomposition (DMD), Proper Orthogonal Decomposition (POD), and Spectral Proper Orthogonal Decomposition (SPOD), in cavitation feature detection in hydraulic machinery. It reviews the mathematical principles of these three algorithms and a series of improvements made by researchers since their inception. It also provides examples of the applications of these three algorithms in different hydraulic machinery. Based on this, the future development trends and possible directions for the improvement of modal decomposition methods are discussed.

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Section: Hydrofoilmentioning

confidence: 99%

Data-Driven Modal Decomposition Methods as Feature Detection Techniques for Flow Fields in Hydraulic Machinery: A Mini Review

Xu,

Zhang,

Zhang

et al. 2024

JMSE

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“…During the daily operation of the mixed-flow pump, transient events inevitably occur, such as the influence of valves on fluid performance (Li et al, 2020a, b, c) rapid start-stop operations (Yang et al, 2021) and dynamic changes in rotational speed (Trivedi et al, 2013). These operating conditions can lead to complex cavitation flows, pressure fluctuations, impact loads on rotating components, intense vibrations (Li et al, 2016a, b) and noise (Yang et al, 2022;Jia et al, 2022). They pose significant risks to the operational safety of the system, the stealthiness of military equipment, and the health of personnel.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Zhang,

Wang,

Yang

et al. 2024

Self Cite

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PurposeThis study aims to investigate the noise-inducing characteristics during the start-up process of a mixed-flow pump and the impact of different start-up schemes on pump noise.Design/methodology/approachThis study conducted numerical simulations on the mixed-flow pump under different start-up schemes and investigated the flow characteristics and noise distribution under these schemes.FindingsThe results reveal that the dipole noise is mainly caused by pressure fluctuations, while the quadrupole noise is mainly generated by the generation, development and breakdown of vortices. Additionally, the noise evolution characteristics during the start-up process of the mixed-flow pump can be divided into the initial stage, stable growth stage, impulse stage and stable operation stage.Originality/valueThe findings of this study can provide a theoretical basis for the selection of start-up schemes for mixed-flow pumps, reducing flow noise and improving the operational stability of mixed-flow pumps.

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“…Phenomena related to the flow of the working medium in the hydraulic system cause vibrations and noise (He et al, 2023;Song et al, 2022;Han et al, 2017). Occasional cavitation causes high-frequency noise to occur (Jia et al, 2022;Park et al, 2020;Zhao et al, 2022;Liu et al, 2022). Thus, time-varying forces excite hydraulic system components to vibrate, and noise is generated as a result of the surface vibrations of these components (Pan et al, 2022;Zhang et al, 2018;Pan et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The Impact of Mechanical Vibrations on Hydraulic Valves and the Possibility of Reducing the Effects

Stosiak,

Skačkauskas,

Deptuła

2024

Aviation

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The paper shows that mechanical vibrations occur in a wide frequency range in the hydraulic systems operating in the real world. Hydraulic valves are also exposed to these vibrations. The paper gives examples of vibration sources and suggests that the influence of vibrations on hydraulic valves could be reduced. Particular attention was paid to the vibrating proportional distributor. The amplitude-frequency spectrum of pressure pulsation in a hydraulic system with a vibrating proportional distributor was analysed. During the tests, the frequency of external mechanical vibrations acting on the proportional distributor and their direction was changed.

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Cavitation flow and broadband noise source characteristics of NACA66 hydrofoil with a V groove on the suction surface

Cited by 27 publications

References 39 publications

Data-Driven Modal Decomposition Methods as Feature Detection Techniques for Flow Fields in Hydraulic Machinery: A Mini Review

Data-Driven Modal Decomposition Methods as Feature Detection Techniques for Flow Fields in Hydraulic Machinery: A Mini Review

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

The Impact of Mechanical Vibrations on Hydraulic Valves and the Possibility of Reducing the Effects

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