Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Elsevier Molina, S.; Salvador Rubio, FJ.; Carreres Talens, M.; Jaramillo, D. (2014). A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles. Energy Conversion and Management. 79:114-127. doi:10.1016/j.enconman.2013.12.015. THE INFLUENCE OF THE USE OF ELLIPTICAL ORIFICES ON THE INNER NOZZLE FLOW AND CAVITATION DEVELOPMENT IN DIESEL INJECTOR A COMPUTATIONAL INVESTIGATION ON

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“…However, the influence of the needle lift on the injection process was already studied by the authors in [19]. …”

Section: Comparison In Terms Of Cavitation Morphologymentioning

confidence: 99%

“…As seen in Figure 10, the area coefficient takes values equal to one in non-cavitating conditions ([15] [19]). Therefore, for these conditions, the velocity coefficient values equal the discharge coefficient ones.…”

Section: Area and Velocity Coefficientsmentioning

confidence: 99%

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Molina

Salvador

Carreres

et al. 2014

Energy Conversion and Management

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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%

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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“…On the other hand, it is well known that the nozzle geometric parameters have a great influence on the spray behavior, as experimentally proved by Desantes et al (2005) and Bermúdez et al (2005) and computationally reproduced by Salvador et al (2013). Thus, coupling internal and external flow simulations leads to a better representation of reality.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence model and inlet boundary condition on the Diesel spray behavior simulated by an Eulerian Spray Atomization (ESA) model

Salvador

Gimeno

Pastor

et al. 2014

International Journal of Multiphase Flow

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Simulating liquid spray first and second atomization is not an easy task. Many models have been developed over the past years, but Eulerian ones have proved their better performance for the dense zone of the spray. In this work a new compressible Eulerian model is used to compute the internal flow together with the spray. Up to five two-equation turbulence models have been tested and its influence is remarkable in terms of spray behavior, but also greatly affects the mass flow rate and the momentum flux. At the end, SST k − ω model proves to be best than the others. Additionally, different types of inlet boundary conditions have been also tested and analyzed. Results when compared with previously obtained experimental data show that the commonly used for external flow time-varying velocity boundary condition gives also good performance for the internal flow.

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Study of the influence of the needle lift on the internal flow and cavitation phenomenon in diesel injector nozzles by CFD using RANS methods

Cited by 120 publications

References 38 publications

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

A computational investigation on the influence of the use of elliptical orifices on the inner nozzle flow and cavitation development in diesel injector nozzles

Water Hammer Induced Cavitation - A Numerical and Experimental Study

Effect of turbulence model and inlet boundary condition on the Diesel spray behavior simulated by an Eulerian Spray Atomization (ESA) model

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