Numerical investigation of tip vortex cavitation noise with an emphasis on environmental nucleation effect DOI
Zhongpo Yang, Xincheng Wang, Mingtai Song

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The multiscale interactions between macroscale cavities and microscale nuclei influence the tip vortex cavitation (TVC) dynamics its induced noise. To study underlying mechanisms, we employ a two-way transition coupling Euler–Lagrange model. Through acoustic analogy analysis, identify cavity volume fluctuations as main vocal mechanism of cavitating vortex, highlighting two critical dynamics, i.e., breathing mode surface waves collapse downstream end. Multiscale simulation results suggest that merging bubbles into can generate more continuous enlarge size. In addition, high-frequency noise is significantly increased due to injection, reduced cavity. Our investigation provides foundation for understanding TVC

Language: Английский

Experimental and Eulerian-Lagrangian numerical investigation on cavitation erosion characteristics in Venturi pipes with different divergent angles DOI Creative Commons

Qing Yang,

Mingming Chen,

Chengqian Pei

et al.

Ultrasonics Sonochemistry, Journal Year: 2025, Volume and Issue: 114, P. 107278 - 107278

Published: Feb. 16, 2025

Hydrodynamic cavitation (HC) is widely found in fluid machinery and has emerged as a significant technology several engineering fields. To investigate the erosion characteristics caused by HC, experimental tests under varying conditions are conducted this study using Venturi test section with different divergent angles. The qualitative risk distributions represented through paint experiments, showing that increases angle decreases. Subsequently, Eulerian-Lagrangian multiscale model adopted to simulate HC section. This directly resolves large-scale cavities volume of (VOF) method simultaneously tracks sub-scale discrete bubbles bubble (DBM). A modified aggressive indicator [Li et al., Int. J. Mech. Sci. 262, 108,735 (2024)] incorporated into account for power produced behaviors, thereby reproducing distribution risks. Simulations corresponding conducted, results show simulated features align well observations. Furthermore, predicted present agree tests, confirming reliability our model.

Language: Английский

Citations

2
Analysis of the effect of blade inclination angle on the performance of oblique spiral cavitating nozzle DOI
Xiaoping Chen, Zhipeng He, Xin Ao

et al.

International Journal of Multiphase Flow, Journal Year: 2025, Volume and Issue: unknown, P. 105141 - 105141

Published: Jan. 1, 2025

Language: Английский

Citations

0
Multiscale numerical investigation of bubble distribution characteristics and cavitation erosion risk evolution with special emphasis on the influence of cavitation number DOI
Ziyang Wang, Huaiyu Cheng, Xianwu Luo

et al.

Ocean Engineering, Journal Year: 2025, Volume and Issue: 321, P. 120398 - 120398

Published: Jan. 22, 2025

Language: Английский

Citations

0
LES investigation of oblique inflow effects on propeller cavitating tip vortex DOI

Lin Chen,

Xincheng Wang, Dengcheng Liu

et al.

Ocean Engineering, Journal Year: 2025, Volume and Issue: 325, P. 120868 - 120868

Published: March 7, 2025

Language: Английский

Citations

0
Experimental investigation of cavitation erosion-induced surface damage and particle shedding from PTFE DOI Creative Commons
Rui Su, Yiming Liu, Liang Hu

et al.

Materials & Design, Journal Year: 2025, Volume and Issue: unknown, P. 113886 - 113886

Published: March 1, 2025

Language: Английский

Citations

0
A Multi-Index Fusion Adaptive Cavitation Feature Extraction for Hydraulic Turbine Cavitation Detection DOI Creative Commons
Yi Wang, Feng Li,

Mengge Lv

et al.

Entropy, Journal Year: 2025, Volume and Issue: 27(4), P. 443 - 443

Published: April 19, 2025

Under cavitation conditions, hydraulic turbines can suffer from mechanical damage, which will shorten their useful life and reduce power generation efficiency. Timely detection of phenomena in is critical for ensuring operational reliability maintaining energy conversion However, extracting features challenging due to strong environmental noise interference the inherent non-linearity non-stationarity a hydroacoustic signal. A multi-index fusion adaptive feature extraction method proposed solve above problems. The number decomposition layers variational mode (VMD) algorithm adaptively determined by fusing multiple indicators related characteristics, thus retaining more information improving quality extraction. Then, are selected based on frequency characteristics different degrees cavitation. In this way, incipient secondary supercavitation realized. Finally, effect was verified using hydro-acoustic signal collected mixed-flow hydro turbine model test stand. accuracy rate false alarm were used as evaluation indicators, comparison results showed that has high low rate.

Language: Английский

Citations

0
Experimental study on the cavitation erosion resistance characteristics of 17-4PH under the structure of hundred-micron array grooves on the surface DOI

Juan Di,

Nian Wang, Jun Ji

et al.

Tribology International, Journal Year: 2025, Volume and Issue: 210, P. 110751 - 110751

Published: April 25, 2025

Language: Английский

Citations

0
Sidewall-attached vortex hidden in a pump sump: evolution process and induced pressure oscillation DOI
Bowen Zhang, Lei Ma, Li Cheng

et al.

Experimental Thermal and Fluid Science, Journal Year: 2025, Volume and Issue: unknown, P. 111524 - 111524

Published: May 1, 2025

Language: Английский

Citations

0
Numerical investigation of tip vortex cavitation noise with an emphasis on environmental nucleation effect DOI
Zhongpo Yang, Xincheng Wang, Mingtai Song

et al.

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

The multiscale interactions between macroscale cavities and microscale nuclei influence the tip vortex cavitation (TVC) dynamics its induced noise. To study underlying mechanisms, we employ a two-way transition coupling Euler–Lagrange model. Through acoustic analogy analysis, identify cavity volume fluctuations as main vocal mechanism of cavitating vortex, highlighting two critical dynamics, i.e., breathing mode surface waves collapse downstream end. Multiscale simulation results suggest that merging bubbles into can generate more continuous enlarge size. In addition, high-frequency noise is significantly increased due to injection, reduced cavity. Our investigation provides foundation for understanding TVC

Language: Английский

Citations

0