Numerical prediction of the spray from an air-assisted fuel injection system via Eulerian–Lagrangian approach

Du, Bingxuan; Zhao, Zhenfeng

doi:10.1016/j.egyr.2021.09.128

Cited by 14 publications

(3 citation statements)

References 16 publications

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“…[87], they combined full region air flow simulations from the nozzle exit up to the target with experimentally obtained initial conditions for the droplet size distributions and the droplet velocities near the nozzle as a compromise, because the primary phase of liquid disintegration and droplet formation cannot be simulated. This was the main research scheme that most of the researchers used in those years, and even up to now [93][94][95][96]; namely, relevant parameters such as spray particle size and velocity were measured experimentally and then used as initial and boundary conditions for the film formation model. Instead, with the continuous progress of CFD technology, the future use of accomplishing the whole process of numerical simulation of airless spraying from the initial atomization to the adhesion of film formation will definitely be a more advanced, more efficient and more promising research program.…”

Section: Research On Film Formation Characteristics and Mechanismsmentioning

confidence: 99%

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Wu,

Chen,

Liu

et al. 2023

Coatings

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The special surface appearance of complex surfaces restricts the coating film quality of spraying. The study of the atomization and film formation characteristics of typical complex surfaces, as well as the spraying mechanism, is essential for planning the spraying robotic trajectory and improving the spraying efficiency. In this paper, modeling and characteristics of the atomization and film formation process, based on CFD numerical simulations in previous studies, are systematically reviewed, focusing especially on airless spraying. In addition, the advantages and disadvantages of the existing research from the perspective of numerical models and methods are discussed. Finally, a further research direction for spraying on complex surface is prospected. Overall, a comprehensive and up-to-date review of spray atomization and film formation characteristics is considered valuable to practitioners and researchers in these fields, and will facilitate the further application of robotic spraying in the mechanical, automotive, marine, aerospace, petrochemical and other industries.

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Section: Research On Film Formation Characteristics and Mechanismsmentioning

confidence: 99%

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Wu,

Chen,

Liu

et al. 2023

Coatings

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“…It is essential in CFD simulations to minimize the discretization errors and ensure accurate results. Some of the literature has reported that grid size has a significant effect on the convergence and predicted results [24,25]. In this study, a grid independence study was performed to ensure that the grid was sufficiently refined with respect to different sizes.…”

Section: Grid Independence Studymentioning

confidence: 99%

Computational Fluid Dynamics: Flow Analysis on The Effect of Different Jet Orifice Angle Multi Circular Jet for Fuel and Air Mixing

Ridzwan Kamaruddin,

Syabillah Sulaiman,

Amir Khalid

et al. 2023

CFDL

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The mixing of fuel and air plays a major role in the spray and flame behavior, hence affecting the combustion performance and emissions of the internal mixing air-assisted atomizers. Air-assisted atomizers are introduced to counter the low-pressure differential of a simplex nozzle, which reduces the atomization quality. The present study aims to determine the effects of Multi Circular Jet (MCJ) plates on the geometrical configurations of internal flows in mixing chamber and the internal flow of plate 3 using different properties of fuel. In this study, the realizable k-ε turbulence model, specifically designed for strongly swirling flows, is validated through numerical simulations. The turbulence model selected is a type of Reynolds averaged Navier-Stokes (RANS) model called the k-ε model. The MCJ plates provide the primary air entrance into the mixing chamber. Additionally, it acts as a turbulence generator and can be adjusted to alter the flow of fuel and air mixtures in a mixing chamber. The study compares several MCJ geometries in terms of pressure, speed, turbulent kinetic energy, and volume fraction and compares the performances of diesel and Crude Palm Oil (CPO) B30 biodiesel fuels. The findings imply that CPO B30 biodiesel has superior atomization and mixing due to its higher density and turbulent kinetic energy. CPO B30 biodiesel was compared to Diesel in terms of maximum pressure, average speed, turbulent kinetic energy per unit mass, and volume fraction. The results indicate that CPO B30 has lower pressure and higher velocity than Diesel, suggesting better fuel atomization and mixing. The higher density of CPO B30 leads to increased turbulent kinetic energy, improving fuel-air mixing inside the combustion chamber. The study demonstrates that the use of MCJ plates can enhance mixing in a mixing chamber. In addition, MCJ plates show the ability to control the spray and atomization. The findings of this study contribute to a better understanding of the relationships between geometry and fuel-air mixing, as well as the characteristics of the internal mixing air-assisted atomizer, which will lead to future burner system improvements.

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“…The simulation results indicate that as the ambient pressure increases, the spray layer becomes narrower, and the penetration decreases. Du et al [11] proposed an improved air-assisted spray simulation method based on ANSYS FLUENT, which resulted in a 13.5% reduction in mean errors for spray volume and a 10.2% reduction in mean errors for penetration. Yang et al [12] utilized the Euler-Lagrange theorem to simulate the particle size distribution of high-pressure spray using FLUENT.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Numerical Simulation of Curved Surface Coating Trajectory Based on STL Slicing Algorithm

Xu,

Cheng,

Liu

et al. 2024

Coatings

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The thickness of the coating on the surface of a workpiece is an important factor in determining the quality of spraying. However, it is challenging to estimate the distribution of film thickness accurately before the actual spraying process. This lack of estimation hinders the optimization of spraying process parameters and trajectory. To overcome this, a numerical simulation of surface spray coating thickness was conducted to provide guidance for the actual coating process. The research consists of three main parts. Firstly, the spray trajectory of the spray gun is determined using the proposed Stereo Lithography (STL) model slicing algorithm. Secondly, a two-phase flow spray model and collision adhesion model are established to construct the spray film model. The surface mesh is determined, and the spraying process parameters are set. Finally, numerical simulation is conducted to analyze the dynamic spraying trajectory and the distribution of coating thickness. The results show that the coating thickness distribution on an arc surface is thicker in the middle and thinner on the edges. The distribution is symmetric with respect to both the transverse and longitudinal directions of the arc surface. The coating thickness distribution at both ends is not as uniform as in the middle section. The concave part of the free surface has the largest coating thickness, while the coating thickness distribution on the convex part is not as uniform as on the relatively flat part. This method of simulating the coating thickness distribution on complex surfaces provides a solid foundation for further optimization of spraying process parameters and trajectory, ultimately improving the qualification rate of workpiece spraying processing.

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Numerical prediction of the spray from an air-assisted fuel injection system via Eulerian–Lagrangian approach

Cited by 14 publications

References 16 publications

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

A Review of the Developments of the Characteristics and Mechanisms of Airless Spraying on Complex Surfaces

Computational Fluid Dynamics: Flow Analysis on The Effect of Different Jet Orifice Angle Multi Circular Jet for Fuel and Air Mixing

Dynamic Numerical Simulation of Curved Surface Coating Trajectory Based on STL Slicing Algorithm

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