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Qiaorui Si, Fanjie Deng, Yu Lu, Minquan Liao and Shouqi Yuan
A numerical method using combined detached-eddy simulation (DES) and a cavitation model considering the rotation effect is used for unsteady cavitation flow field of the centrifugal pump. A closed-type pump test system was established to obtain the pump ...
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Baoling Cui, Xiaotian Han and Yinchu An
Cavitation is an undesirable phenomenon in the pumps. In this paper, unsteady cavitation flow in a low-specific-speed centrifugal pump with an inducer is investigated based on the full cavitation model and standard k-e turbulence model using the commerci...
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Tiezhi Sun, Qingmo Xie, Li Zou, Hao Wang and Chang Xu
Cavitation is a typical and unavoidable phenomenon for small waterline ships and high-speed vehicles. It creates a highly complex multiphase flow near the free surface and is primarily represented by the free surface-cavitation interaction. In this paper...
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Seungnam Kim and Spyros A. Kinnas
Reducing the on-board noise and fluctuating pressures on the ship hull has been challenging and represent added value research tasks in the maritime industry. Among the possible sources for the unpalatable vibrations on the hull, propeller-induced pressu...
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Dario Valentini, Giovanni Pace, Angelo Pasini, Ruzbeh Hadavandi and Luca d?Agostino
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Dario Valentini, Giovanni Pace, Angelo Pasini, Ruzbeh Hadavandi and Luca D?Agostino
The paper presents an experimental campaign aimed at the characterization of the relationship between cavitation-induced instabilities and forces acting on the shaft, relevant to space application turbopumps. The experiments have been carried out on a si...
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Tiezhi Sun, Xiaoshi Zhang, Jianyu Zhang and Cong Wang
High-speed underwater vehicles are subjected to complex multiphase turbulent processes, such as the growth, development, shedding, and collapse of cavitation bubbles. To study the cavity evolution and pressure pulsation characteristics, in this paper, cl...
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Francisco Alves Pereira, Fabio Di Felice and Francesco Salvatore
An experimental study is carried out in a cavitation tunnel on a propeller operating downstream of a non-uniform wake. The goal of this work is to establish quantitative correlations between the near pressure field and the cavitation pattern that takes p...
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Min Son, Michael Börner, Wolfgang Armbruster and Justin S. Hardi
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 unstea...
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Haiyu Liu, Fangping Tang, Shikai Yan and Daliang Li
The S-shaped hydrofoil is often used in the design of reversible machinery due to its centrally symmetrical camber line. The objective of this paper is to study the influence of cloud cavitation on the flow structure and the unsteady characteristics of l...
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Leonie S. Föhring, Peter Møller Juhl and Dietrich Wittekind
Low-frequency broadband shipping noise causes a growing concern for marine fauna together with the demand for noise reduction. Detailed analyses of the cavitation behaviour in the time domain serve as a prerequisite for steps toward quieter propellers. U...
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Hao Wang, Jian Feng, Keyang Liu, Xi Shen, Bin Xu, Desheng Zhang and Weibin Zhang
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...
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Siru Chen, Yao Shi, Guang Pan and Shan Gao
Aiming at the problem of unsteady cavitation during a projectile?s vertical water-exit process, scaled model experiments were carried out based on the self-designed underwater launch platform and high-speed cameras, which focus on changes in cavitation s...
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Hu Qixiang, Yang Yang, Shi Weidong, Cao Weidong and Shi Yansheng
Cavitation is regarded as a considerable factor causing performance deterioration of pumps under off-design conditions, especially at overload conditions. To investigate the unsteady cavitation evolution around the tongue of a pump volute, and its influe...
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Jing Li, Chunbao Liu and Xiaoying Li
This paper examines the effects on a Clark-y three-dimensional hydrofoil of wavy leading-edge protuberances in a quantitative and qualitative way. The simulation is accompanied by a hybrid RANS-LES model in conjunction with Zwart-Gerber?Belamri model. De...
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Chaosheng Zheng, Dengcheng Liu and Hongbo Huang
The numerical simulation of propeller cavitation benchmark tests of YUPENG ship model is studied based on OpenFOAM, an open-source CFD (Computational Fluid Dynamics) platform, and the benchmark tests are introduced as well. The propeller cavitation shape...
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Giuseppe Pezzinga
Water hammer flow is examined, putting into evidence that unsteady friction cannot be fully responsible for observed oscillation damping. The measured piezometric head oscillations of water hammer flow experimental tests carried out for very long time (a...
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Zilin Ran, Wenxing Ma and Chunbao Liu
Recent experiments have shown interactions between the cavitation and fluid vortex formation in a hydrodynamic torque converter. This study aimed to clarify the unsteady cavitation trigger mechanism and flow-induced vibration caused by turbulence?cavitat...
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Minsheng Zhao, Decheng Wan and Yangyang Gao
The present work focuses on the comparison of the numerical simulation of sheet/cloud cavitation with the Reynolds Average Navier-Stokes and Large Eddy Simulation(RANS and LES) methods around NACA0012 hydrofoil in water flow. Three kinds of turbulence mo...
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Garam Ku, Cheolung Cheong, Ilryong Park and Hanshin Seol
In this study, the high-fidelity numerical methods are developed to investigate the tip vortex cavitation (TVC) inception and noise of underwater propellers, namely, Model-A and Model-B, which are designed to investigate the effects of sweep angle on cav...
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