Combined experimental observation and numerical simulation of the cloud cavitation with U-type flow structures on hydrofoils

Peng, Xiaoxing; Wang, Xincheng; Cao, Yantao; Xu, Lianghao; Zhang, Guoping; Luo, Xianwu; Long, Xinping

doi:10.1016/j.ijmultiphaseflow.2015.10.006

Cited by 110 publications

(21 citation statements)

References 47 publications

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“…This research elucidated the mechanism of bubble evolution of the high-speed centrifugal pump. There have also been some experimental observations around hydrofoils carried out by Peng [2] in the cavitation tunnel to explain the spatial-temporal evolution of cloud cavitation. They found that U-type flow structures are common in cloud cavities, and sheet cavities always have a convex-concave profile.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Wang

Zou

et al. 2019

Applied Sciences

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To provide theoretical basis for cavitation noise control, the cavitation evolution around a hydrofoil and its induced noise were numerically investigated. A modified turbulence model and Zwart cavitation model were employed to calculate the flow field and predict the cavitation phenomenon accurately. Then, the acoustic analogy method based on the Ffowcs Williams-Hawking (FW-H) equation was applied to analyze the cavitation-induced noise. Seven cavitation numbers were selected for analysis. Acoustic power spectral density (PSD) and acoustic pressure were investigated to establish the relationship between cavitation number and their acoustic characteristics. It was indicated that as cavitation number decreases, cavitation cycle length gets shorter and the magnitude of acoustic power spectral density increases dramatically. One peak value of acoustic power spectral density induced by the extending and retracting of leading-edge cavitation can be obtained under sheet cavitation conditions, while under cloud cavitation, two peak values of acoustic power spectral density can be obtained and are induced by superposition from leading-edge cavitation and trailing vortex.

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Section: Introductionmentioning

confidence: 99%

Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Wang

Zou

et al. 2019

Applied Sciences

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“…For the purpose of predicting the pump performance under cavitation state before manufacturing or optimizing, many efforts have been made on simulating cavitating flow in pump, since the computational capabilities gains great development in decades. Various computing methods were investigated to solve the vaporization and condensation procedures, among which the homogeneous equilibrium flow method was considered as one of the best approach for simulating the cavitating flow in all kinds of circumstances [11][12][13][14][15][16][17][18][19]. It assumes the flow to be homogenous, treating the liquid and vapor as a mixture.…”

Section: Introductionmentioning

confidence: 99%

Rotating Corrected-Based Cavitation Model for a Centrifugal Pump

Wang

Liu

et al. 2018

Journal of Fluids Engineering

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Cavitation has bothered the hydraulic machinery for centuries, especially in pumps. It is essential to establish a solid way to predict the unsteady cavitation evolution with considerable accuracy. A novel cavitation model was proposed, considering the rotating motion characteristic of centrifugal pump. Comparisons were made with three other cavitation models and validated by experiments. Considerable agreements can be noticed between simulations and tests. All cavitation models employed have similar performance on predicting the pump head drop curve with proper empirical coefficients, and also the unsteady cavitation evolution was well solved. The proposed rotating corrected-based cavitation model (rotating based Zwart-Gerber-Belamri (RZGB)) obtained identical triangle cavity structure with the experiment visualizations, while the others also got triangle structure but with opposite direction. The maximum flow velocity in the impeller passage appears near the shroud, contributing to the typical triangle cavity structure. A preprocessed method for instant rotating images was carried out for evaluating the erosion risk area in centrifugal pump, based on the standard deviation of gray level. The results imply that the unsteady rear part of the attached cavity is vulnerable to be damaged, where the re-entrant flow was noticed. This work presented a suitable cavitation model and reliable numerical simulation approach for predicting cavitating flows in centrifugal pump.

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“…However, cloud cavitating flow is a complicated process coupled with phase change, vertical structures and micro bubble clusters, the understanding on the dynamic process is still not enough at this moment. Recent study (Cao et al 2015, Peng et al 2016) has shown that there exist distinct U-shaped vortex structures in large scale cloud cavitating flows under various flow configurations. And the overall contribution of different cavitation structures to cavitation erosion was evaluated qualitatively using painting method (Cao et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Synchronized Measurement of Cloud Cavitating Flow around a 3D Twisted Hydrofoil

Cao¹,

Peng²,

Xu³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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Cloud cavitation shedding from sheet cavitation usually can be seen on propellers, rudders and shaft brackets of fast running ships. The unsteady and instable behavior of these cavitation structures generally can produce severe impingement on the neighboring wall, which is one of the main reasons for vibration, noise and erosion induced by cavitation. Therefore, it is significant to know the relation between the cavitation structure and its reduced pressure signals, which can help to recognize the generation mechanism of cavitation impact. In this paper, cavitation behavior, pulse pressure and noise were synchronized measured to illustrate the dynamic characteristics of cavitation structures around a 3D twisted hydrofoil. The pressure fluctuation and noise were recorded under different cavitation numbers, including cases of flow without cavitation and with cavitation at the same incoming velocity. Then cavitation behavior and relevant pressure signals were compared both in time domain and in frequency domain to investigate the relation between the unsteady cavitation structures and the corresponding pressure response.

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Combined experimental observation and numerical simulation of the cloud cavitation with U-type flow structures on hydrofoils

Cited by 110 publications

References 47 publications

Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

Rotating Corrected-Based Cavitation Model for a Centrifugal Pump

Synchronized Measurement of Cloud Cavitating Flow around a 3D Twisted Hydrofoil

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