Development and validation of an improved atomization model for GDI spray simulations: Coupling effects of nozzle-generated turbulence and aerodynamic force

Li, Yaoting; Huang, Yongcheng; Luo, Kun; Liang, Mengmeng; Lei, Bin

doi:10.1016/j.fuel.2021.120871

Cited by 17 publications

(10 citation statements)

References 32 publications

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“…The Kelvin–Helmholtz and Rayleigh–Taylor (KH‐RT) model takes into account the effects of turbulence and cavitation on droplet breakage in spray flow, and has high accuracy in spray simulation calculation under high pressure 17 . Therefore, the KH‐RT model is adopted.…”

Section: Simulation Model Establishmentmentioning

confidence: 99%

Numerical research of biodiesel spray coupled cavitation by different environmental simulations under high injection pressure

Zhang

et al. 2023

Energy Science & Engineering

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The effects of injection pressure and ambient pressure on biodiesel spray characteristics were studied by coupling the in-nozzle flow, and a constantvolume combustion bomb experimental platform was built to verify the accuracy of the coupled numerical model. Spray tip penetration (STP), spray velocity, and droplet size/number distribution of biodiesel were calculated at different injection pressures (200, and environmental pressures (0.1, −0.5, −1.0, and −2.0). The sensitivity to injection pressures and environmental pressures was analyzed with particle concentration as the characteristic parameter. With the increase of injection pressure, the STP of biodiesel increased by 5%, which resulted in a faster decrease in the increasing rate of STP (V ). Under the same conditions, with the increase of injection pressure, the axial and radial velocities of fuel droplets gradually rose, and the high-speed area was enlarged, while the number of droplets and Sauter mean diameter (SMD) space generally decreased. Compared with the injection pressure, the environmental pressure significantly inhibited the STP and velocity of biodiesel, and the increasing rate of STP (V ) decreased gradually and the number of droplet particles and SMD rose with the increase of the environmental pressure.

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Section: Simulation Model Establishmentmentioning

confidence: 99%

Numerical research of biodiesel spray coupled cavitation by different environmental simulations under high injection pressure

Zhang

et al. 2023

Energy Science & Engineering

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“…The hybrid breakup model we recently developed is adopted to model the PFI spray atomization. 44 Firstly, a definition of breakup length, L bu , is introduced to distinguish the primary and secondary breakup of the atomizing spray. The droplet parcels within L bu undergo the primary breakup, while those outside L bu undergo the secondary breakup.…”

Section: Fuel Injection and Spray Atomization Modelmentioning

confidence: 99%

Combined experimental and numerical study on fuel deposition characteristics of an impinging PFI spray with different impingement geometries

Huang

Luo

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a combined experimental and numerical study on the fuel deposition characteristics during the Port fuel injection (PFI) spray impingement process. The numerical models mainly consisted of a newly developed atomization model, the Senda spray impingement model, and the Bai-Gosman liquid film model. A group of measurement methods were used to hierarchically calibrate and validate the numerical models. It was found that the calibrated models were able to predict the time-resolved morphology of the impinging spray, as well as the shape, area, and thickness distribution of the deposited fuel film with a good reliability. Then the calibrated models were used to study the effects of impingement distance ( Lw) and impingement angle ( θw) on the fuel film deposition. The results showed that as Lw increases, the film area ( Af) and film mass ( mf) rise faster and reach higher final values. As θw increases, Af and mf grow slower, and their final values are hugely reduced. Increasing Lw and decreasing θw can effectively reduce the average film thickness ( hf,a). Af is mainly affected by the contact area between the spray plumes and the impinging wall, while mf is also affected by the dominant droplet-wall interaction regime.

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“…Therefore, the selection of an appropriate droplet turbulent diffusion model is the premise to ensure the accuracy of the simulation. In this paper, the Fire software's own enable model was as follows [41]:…”

Section: Turbulence Model and Turbulence Diffusion Modelmentioning

confidence: 99%

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

et al. 2021

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In this work, an effective numerical simulation method was developed and used to analyze the effects of natural gas mixing ratio and pilot-main injection, main-post injection, and pilot-main-post injection strategies on the combustion and emission characteristics of diesel engine fueled with dual fuel. Firstly, the one-dimensional calculation model and three-dimensional CFD model of the engine were established by AVL-BOOST and AVL-Fire, respectively. In addition, the simplified chemical kinetics mechanism was adopted, which could accurately calculate the combustion and emission characteristics of the engine. The results show that the cylinder pressure and heat release rate decrease with the increase of the natural gas mixing ratio and the NOx emission is reduced. When the NG mixing ratio is 50%, the NOx and CO emission are reduced by 47% and 45%, respectively. When the SODI3 is 24 °CA ATDC, the NOx emission is reduced by 29.6%. In addition, with suitable pilot-main injection and pilot-main-post injection strategies, the combustion in the cylinder can be improved and the trade-off relationship between NOx and soot can be relaxed. Thus, the proper main-post injection strategy can improve the combustion and emission characteristics, especially the reduction in the NOx and CO emissions.

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Development and validation of an improved atomization model for GDI spray simulations: Coupling effects of nozzle-generated turbulence and aerodynamic force

Cited by 17 publications

References 32 publications

Numerical research of biodiesel spray coupled cavitation by different environmental simulations under high injection pressure

Numerical research of biodiesel spray coupled cavitation by different environmental simulations under high injection pressure

Combined experimental and numerical study on fuel deposition characteristics of an impinging PFI spray with different impingement geometries

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

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