Numerical Investigation on Effects of Elliptical Diesel Nozzle on Primary Spray Characteristics by Large Eddy Simulation (Les)

Yu, Shengwei; Yin, Bifeng; Deng, Wang-Qiu; Jia, Huang; Ye, Ze; Xu, Bin; Xu, Huacheng

doi:10.1615/atomizspr.2018026642

Cited by 10 publications

(7 citation statements)

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“…In this regard, Lee et al [4] performed a study with 2 different ellipse eccentricities and found an improvement on the spreading angle, in particular on the minor axis plane and similar results were obtained by Yu, et al [5]. From the computational point of view, different approaches have been made also by Yu et al [6] performed Large Eddy Simulations (LES) with Volume-Of-Fluid (VOF) method of a singlehole elliptical nozzle. Salvador et al [7] used the Σ − model and Homogeneous Relaxation Model to evaluate the cavitation in a multi-hole elliptical geometry with different eccentricities.…”

Section: Introductionmentioning

confidence: 76%

Study Of The Influence Of Nozzle Shape On The Primary Atomization Process By Means Of Direct Numerical Simulation

Salvador

Gimeno

Carreres

et al. 2021

ICLASS

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The atomization process is a physical phenomenon that takes place as an essential mechanism in many industrial fields. Even though it has been widely addressed in the literature, there are still several aspects of primary atomization that are far from being understood. In order to shed light on the physical processes that take place in the near-field of the injection, Direct Numerical Simulations (DNS) are rising as a fundamental tool to provide detailed data where the optical access is difficult and expensive. Nevertheless, most real engineering conditions are too complex to be accurately resolved with DNS. Hence, a more fundamental standpoint is chosen to first understand the fundamental mechanisms that drive the process. In this context, this work presents a study of the influence of the nozzle shape on droplet formation by using DNS simulations performed with the Paris-Simulator code. The injection inflow conditions are obtained by mapping results from Large Eddy Simulation (LES) of an elliptic duct with eccentricity factor of 0.85, maintaining the bulk velocity and the crosssection area. The Reynolds number for all cases is maintained around 5000 and the Weber number around 26000. Results are compared to a round jet DNS simulation also performed with a mapped boundary condition. The main aim of the work is to understand how the elliptic cross-section eccentricity affects the atomization regime, breakup mechanism, droplet azimuthal distribution and turbulent structures.

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Section: Introductionmentioning

confidence: 76%

Study Of The Influence Of Nozzle Shape On The Primary Atomization Process By Means Of Direct Numerical Simulation

Salvador

Gimeno

Carreres

et al. 2021

ICLASS

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“…Elliptical liquid jets are known to result in lower jet penetration and increased width of the spray. Yu et al [9] has performed experiments for various elliptic nozzles under typical diesellike conditions. For the present study, one of the nozzles used has been simulated under three different injection conditions.…”

Section: Study Of Elliptical Jet Penetrationmentioning

confidence: 99%

“…A body of influence (BOI) is used near the nozzle exit to obtain a refined mesh. Yu et al [9] performed mesh independence studies by comparing the inlet pressure obtained in CFD simulation as a function of mesh size in the nozzle. It was found that a mesh size of 2 microns is needed to obtain mesh independent results.…”

Section: Study Of Elliptical Jet Penetrationmentioning

confidence: 99%

“…Dolatabadi et al [8] used volume of fluid (VOF) method to simulate the axis-switching phenomenon observed by Kasyap et al [7]. Yu et al [9] used large eddy simulation (LES) model along with the VOF method to simulate the primary atomization of the elliptical liquid jet and compared the spray breakup length, turbulent structures between circular and elliptical jets. Zhang et al [10] also used a combination of VOF and LES turbulence models to study the elliptical jet breakup with cavitation in the nozzles.…”

Section: Introductionmentioning

confidence: 99%

“…The measurements of Yu et. al [9] are used as a benchmark for evaluating the performance of the CFD models. The third part of the CFD study focuses on predicting the droplet size distribution far downstream of the nozzle, and the results are compared with experimental measurements of Yunyi et al [3].…”

Section: Introductionmentioning

confidence: 99%

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Spray Characterization of Elliptical Diesel Nozzles Using Hybrid VOF-to-DPM Transitional Approach in Large Eddy Simulation (LES) Framework

Kumar

Patil

et al. 2021

ICLASS

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Elliptical nozzles are known to provide increased spray angle and lower Sauter mean diameter of droplets, thus resulting in improved fuel-air mixing quality that significantly impacts the combustion efficiency and emissions for modern diesel engines. Numerical simulations play an important role in understanding the breakup process in elliptical nozzles and the effect of different parameters such as aspect ratio, injection pressure, back pressure, etc. on the performance of the nozzles. Generally, large eddy simulations (LES) and volume of fluid (VOF) method are combined to understand the characteristics of the elliptical sprays. However, the resolution of the minimum droplet size is limited by the size of the mesh; therefore, such numerical approaches are difficult to adopt for industrial applications. In the current paper, VOF-to-DPM transitional approach and dynamic unstructured mesh refinement are explored to cut down the simulation cost without affecting the simulation accuracy. VOF method captures the core and the larger droplets while Discrete Phase Model (DPM) captures the smaller droplets using the Subgrid approach. VOF-to-DPM transitional approach converts the droplets from VOF framework to DPM framework conserving mass, momentum, and energy. Since smaller droplets are captured in the Subgrid approach, the overall mesh count requirement is considerably smaller than the pure VOF approach. Dynamic unstructured mesh refinement helps to resolve the VOF interface accurately. At the same time, it keeps the mesh count at a reasonable level. Using these approaches, the mechanism of spray breakup and axis switching of elliptical sprays at different operating conditions is studied and the obtained spray tip penetration and Sauter mean diameters are compared with experimental data.

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Effect of elliptical and circular GDI injectors on spray impingement characteristics

JI,

YU,

et al. 2024

Sādhanā

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Numerical Investigation on Effects of Elliptical Diesel Nozzle on Primary Spray Characteristics by Large Eddy Simulation (Les)

Cited by 10 publications

References 0 publications

Study Of The Influence Of Nozzle Shape On The Primary Atomization Process By Means Of Direct Numerical Simulation

Study Of The Influence Of Nozzle Shape On The Primary Atomization Process By Means Of Direct Numerical Simulation

Spray Characterization of Elliptical Diesel Nozzles Using Hybrid VOF-to-DPM Transitional Approach in Large Eddy Simulation (LES) Framework

Effect of elliptical and circular GDI injectors on spray impingement characteristics

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