Definition of a CFD Multiphase Simulation Strategy to Allow a First Evaluation of the Cavitation Erosion Risk Inside High-Pressure Injector

Brusiani, Federico; Falfari, Stefania; Bianchi, Gian Marco

doi:10.1016/j.egypro.2015.12.081

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…Cavitation-induced erosion has been extensively studied using experimental [1,2,3,4] and computational modeling techniques [4,5,6,7,8,9] to gain insight into the physical mechanisms driving this process for a range of applications, from pump impellers to ship rudders. Cavitation erosion has been noted in diesel injector hardware, namely within the needle seat region and along the injector needle, as well as the entrance to nozzle holes [4,6].…”

Section: Introductionmentioning

confidence: 99%

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Exploration of Cavitation-Induced Erosion Metrics in Throttle Flow Simulations

Magnotti¹,

Battistoni²,

Saha³

et al. 2018

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

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Although there have been extensive experimental and computational investigations in characterizing cavitation phenomenon in both diesel and gasoline direct injectors, much is still unknown about the mechanisms driving cavitation-induced erosion, and how this complicated fluid-structure interaction should be modeled. To explore current modeling capabilities, a numerical investigation was conducted within the CONVERGE modeling framework to assess proposed cavitation erosion metrics in the literature, and their link to the predicted cavitation cloud collapse mechanism. The multiphase flow within the Winklhofer Throttle "U" geometry was modeled using a compressible mixture model, where phase change was represented using the Homogeneous Relaxation Model (HRM) and the turbulent flow evolution was modeled using a dynamic structure approach for Large Eddy Simulations (LES). After comparing the model predictions against available experimental data, representative condensation events and potential cavitation erosion sites were identified. The cavitation cloud structures responsible for potential material damage were visualized through the evolution of the vorticity field. For the modeled throttle geometry, it was found that the horseshoe cloud implosion mechanism was predicted to occur and generate excessive impact loads at the throttle boundary.

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Section: Introductionmentioning

confidence: 99%

“…However, when employing such a framework, there remains a need to link condensation events with cavitation erosion potential. Although several cavitation erosion indicators have been proposed in the literature [5,6,7], no single metric has been identified as universally applicable across all injector geometries and injection conditions.…”

Section: Introductionmentioning

confidence: 99%

Exploration of Cavitation-Induced Erosion Metrics in Throttle Flow Simulations

Magnotti¹,

Battistoni²,

Saha³

et al. 2018

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

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“…More recent studies have shown the value of CFD when determining the effects of water hammer in pipes [8]. Further, CFD have been used successfully to model cavitation and the risk of cavitation erosion in diesel injectors [9,10] and hydraulic valves [11,12]. However, the cavitation in these studies is a consequence of the accelerated flow and cavitation as the result of hydraulic transients has not been considered.…”

Section: Introductionmentioning

confidence: 99%

“…Pressure [6], jet velocity [13] and the condensation source term in the vapor continuity equation [10] are all quantities that have shown potential for cavitation erosion prediction. This study aims to evaluate the possibility to use CFD as a tool for predicting cavitation formation and collapse caused by water hammer pulsations.…”

Section: Introductionmentioning

confidence: 99%

Water Hammer Induced Cavitation - A Numerical and Experimental Study

Jansson

Andersson²,

Pettersson

et al. 2017

Linköping Electronic Conference Proceedings

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Cavitation erosion is one of the main concerns in hydraulic rock drills and can reduce both performance as well as life span. Current simulation tools can detect a potential risk of cavitation, however, the equations do not include cavitation physics and therefore cannot estimate the severity nor erosion locations. In order to evaluate the cavitation damage, long term tests are performed which are both costly and time consuming. With better computational capacity and more accurate numerical flow models, the possibilities to simulate the course of cavitation have increased. So far, most numerical studies on cavitation focus on steady-state problems while studies on hydraulic transients and water hammer effects have received less attention. This paper is a step towards simulation of water hammer induced cavitation and cavitation erosion in pipe flow using Computational Fluid Dynamics (CFD). In order to validate the results, experimental measurements are performed with a test equipment that creates hydraulic transients in a pipe and records these using piezoelectric pressure sensors. The results from CFD are compared to both the experimental data and to numerical results from a software called Hopsan, a one-dimensional multi-domain system simulation tool that uses wave characteristics to calculate pressures and flows. For smaller transients where no cavitation occur, all results show good agreement. For larger transients with cavitation, the results from Hopsan do not longer agree with the measurements, while the CFD model still performs well and is able to predict both formation and collapse of cavitation.

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