Prediction of unsteady, internal turbulent cavitating flow using dynamic cavitation model

Ullas, P.K.; Chatterjee, Dhiman; Vengadesan, S.

doi:10.1108/hff-09-2021-0600

Cited by 11 publications

(3 citation statements)

References 53 publications

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“…Li et al 16 implemented a VOF-DPM solver to model the transition between discrete small-scale bubbles and continuous macro-scale phases for bubbles. Ullas et al (2022) 17 implemented the Dynamic Cavitation Model (DCM) and studied its efficacy. The authors arrived at the conclusion that a combination of DCM to model cavitation and DES (Detached Eddy Simulation) to model turbulence is optimal to predict turbulent cavitating flows.…”

Section: Introductionmentioning

confidence: 99%

The effect of secondary passages on cavitation and radial forces in a liquid propellant turbopump

Moganaradjou

Phukan

Vengadesan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Numerical studies on rocket pumps are computationally expensive and hence the secondary passages such as sidewall clearance gaps, wear ring gaps, axial balancing mechanism, coolant/lubricant paths, etc. in the pump are usually not considered. In this study, a liquid propellant pump with and without secondary passages are modelled and flow simulation results are compared to analyse the differences in cavitation, vortices and radial force predictions arising due to the presence/absence of the secondary flow passages. Single-phase and multiphase simulations are conducted for the design and two off-design points. It is predicted that the presence of secondary passages has a significant effect on the type of cavitation instability predicted and on the volume of cavity generated in the inducer due to which the radial forces generated also differ significantly. The presence of secondary passages predicted large fluctuations from the average radial forces generated by the inducer. These are not obtained if the leakages are not considered. This type of underprediction during the design phase might cause severe wear and tear in the bearings during actual operation. Thus, this study stresses the need for incorporating the secondary passages even at the design stages. This study also highlights the possibility of cavitation instability type manipulation using some means in the inducer which would be significant for cavitation control research in rocket pumps.

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Section: Introductionmentioning

confidence: 99%

The effect of secondary passages on cavitation and radial forces in a liquid propellant turbopump

Moganaradjou

Phukan

Vengadesan

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

Self Cite

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“…The cavitation process initiates in the regions where the local pressure drops below the vapor saturation pressure at the local thermodynamic state (Brennen, 2014;Wr oblewski et al, 2021b;Ullas et al, 2022). Generally, the cloud cavity is known as a highly unsteady…”

Section: Introductionmentioning

confidence: 99%

“…The cavitation process initiates in the regions where the local pressure drops below the vapor saturation pressure at the local thermodynamic state (Brennen, 2014; Wróblewski et al , 2021b; Ullas et al , 2022). Generally, the cloud cavity is known as a highly unsteady turbulent flow which is characterized by large cavity shedding (Laberteaux and Ceccio, 2001; Reisman et al , 1998), strong cavity collapse resulting in the intensive damage on the objected surface (Wróblewski et al , 2021b; Li et al , 2014; Schenke and van Terwisga, 2019).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of modified turbulent viscosity on shedding dynamic of three-phase cloud cavitation around hydrofoil – numerical/experimental analysis

Malekshah

Wróblewski

Bochon

et al. 2022

HFF

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Purpose This paper aims to focus on the cavitating flow around the Clark-Y hydrofoil when the dissolved air is taken into account as the third phase. As the RNG k-epsilon model yields poor prediction due to overestimation of viscosity, the modification approaches including density corrected method, filter-based model and filter-based density correction model are used, and the turbulence model is modified. Also, the numerical results are compared with the experimental data. Design/methodology/approach The cavitating flow is known as a complex multi-phase flow and appeared in the regions where the local pressure drops under saturation vapor pressure. Many researches have been conducted to analyze this phenomenon because of its significant impact on the erosion, vibration, noise, efficiency of turbomachines, etc. Findings The experiments are conducted in a rectangular test section equipped with Clark-Y hydrofoil providing cavity visualization, instantaneous pressure and vibration fluctuations. The simulations are carried out for different cavitation numbers with and without dissolved air. The Fast Fourier Transform, continues wavelet transform and temporal-spatial distribution of gray level are implemented to extract and compare the shedding frequency of experiments and numerical predictions and cavitation evolution. It is concluded that the flow structure, shedding frequency and time-averaged characteristics are highly influenced by the dissolved air. Also, the numerical prediction will be more satisfactory when the modified turbulence models are applied. Originality/value To the best of the authors’ knowledge, the originality of this study is the modification of the turbulence model for better prediction of cavitating flow, and the validation of numerical results with corresponding experimental data.

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考虑旋涡效应的非定常空化流数值模型修正研究

Hong

Xing

2023

Acta Mech. Sin.

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Prediction of unsteady, internal turbulent cavitating flow using dynamic cavitation model

Cited by 11 publications

References 53 publications

The effect of secondary passages on cavitation and radial forces in a liquid propellant turbopump

The effect of secondary passages on cavitation and radial forces in a liquid propellant turbopump

Evaluation of modified turbulent viscosity on shedding dynamic of three-phase cloud cavitation around hydrofoil – numerical/experimental analysis

考虑旋涡效应的非定常空化流数值模型修正研究

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