Numerical simulation of impinging spray characteristics under high ambient pressures with an improved droplet collision model

Yi, Lu; Zhao, Changlu; Zhang, Zhenyu; Zuo, Zhe; Lv, Wei

doi:10.1016/j.fuel.2019.04.042

Cited by 18 publications

(3 citation statements)

References 33 publications

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“…When the injection delay time of biodiesel is 0.5 ms, the n-butanol and biodiesel spray would mix with the collision spray owing to shorter diffusion time in the independent diffusion stage, and the sprays' collision decreases the diffusion rate, which leads to a decrease in the vapor-phase area. 53 The further increase in the injection delay time of biodiesel reduces the collision time but increases the independent diffusion time of the n-butanol and biodiesel spray, which contributes to a larger vapor-phase diffusion area. The ignition and combustion characteristics would also have a significant difference at various spray distributions, which contains ignition delay, flame lift-off length and flame luminosity.…”

Section: Spray Spatial Diffusion Characteristicsmentioning

confidence: 99%

Experimental investigation on collision characteristics of dual-spray with different physical-chemical fuel properties: A case study of butanol-biodiesel fuel combination

Zhang

et al. 2023

International Journal of Engine Research

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The dual direct injection strategy can flexibly control the reactivity distributions and equivalence ratio, which shows a great potential in realizing clean and efficient combustion. However, the sprays’ collision is inevitable when the fuel sprays are injected into the combustion chamber simultaneously owing to limited in-cylinder space, which is rarely investigated. The investigation aims to explore the atomization and combustion characteristics of collision between biodiesel and butanol sprays at different injection delay times of biodiesel (0, 0.5, 1, 1.5, 2 ms). Experiments are conducted in a constant volume combustion chamber. The collision spray and combustion images are captured by optical diagnosis techniques. Several macroscopic parameters are obtained, including spray behavior, spray area, ignition delay, ignition location, flame behavior, flame lift-off length, and natural luminosity intensity. Results show that the variation of injection delay time can effectively change the spray distribution and realize the concentration stratification. The liquid-phase diffusion region increases with an increased premixed charge of butanol spray, but the total evaporation time has a tiny difference. The sprays’ collision can promote the ignition process, but the ignition location is slightly affected by the injection delay time of biodiesel. A trade-off relationship between the vapor-phase diffusion area and combustion characteristics is found. When the injection delay time exceeds 0.5 ms, a longer injection delay time can lead to a larger vapor-phase area, which causes smaller equivalent ratio, longer flame-off length, and lower luminosity intensity. However, a longer injection delay would lead to an uncomplete combustion of the n-butanol spray. At the experimental cases, the injection delay time of biodiesel should be 1/2–2/3 injection duration to realize complete combustion and small emissions.

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Section: Spray Spatial Diffusion Characteristicsmentioning

confidence: 99%

Experimental investigation on collision characteristics of dual-spray with different physical-chemical fuel properties: A case study of butanol-biodiesel fuel combination

Zhang

et al. 2023

International Journal of Engine Research

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“…Te evaporation process of moving droplets is not only often accompanied by relative collisions [1] but also afected by many factors, such as droplet atomization [2], morphological changes, and proximity efects [3]. Meanwhile, the application felds of droplet evaporation are also very wideranging, such as internal combustion engine fuel injection combustion [4], contact desulfurization of atomized droplets with fue gas [5][6][7], seawater desalination [8,9], particleenhanced droplet evaporation [10], and so on.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Mass and Heat Transfer of Droplets Collision in a Flash Evaporation Pattern

Qiu

Zhang

Chai

et al. 2023

International Journal of Chemical Engineering

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The behavior of droplets collision in a flash evaporation ambient widely exists in various fields. In this work, the deformation analysis and thermal analysis models were established under the condition of flash via a computational fluid dynamics (CFD) method. First, the effects of initial temperature and collision velocity on heat and mass transfer during evaporation were considered. Then, the morphology change of the liquid phase, the mass change, and their influencing factors during the droplet evaporation process were analyzed. A very good agreement is observed between the results of this paper and the published literature. The results show that the interaction between the initial collision velocity and the initial temperature affects the heat and mass transfer performance. The initial collision velocity influences the heat and mass transfer process of the evaporating droplet by affecting the deformation characteristics of the droplet. The collision velocity and the liquid temperature have a competitive relationship with the evaporation process. Under a low-initial temperature, the collision velocity played a leading role in the evaporation of the liquid phase and the mass transfer of steam.

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“…En sus resultados encontraron que el chorro al romperse se divide en dos regiones: una región intacta y una región de ruptura.La primera está dominada por la inestabilidad espacial, y la segunda es dominada por la combinación de inestabilidad temporal e inestabilidad espacial. Resaltando un efecto importante de la tensión superficial, sobre la inhibición de atomización en gotas y promoción de adhesión en la columna diesel y ligamentos líquidos.Por su parte,Lu et al (2019) evaluaron experimental y numéricamente, características del espray en ambientes de alta presión (10-60 atm). Adoptaron un modelo de colisión de gotas dependiente de la presión, comparando los resultados con predicciones de Estrade et al y el modelo de colisión de gotas de O'Rourke.…”

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Análisis comparativo de la formación de espray diesel y biodiesel en una boquilla 4JH1 mediante cfd

Caballero,

Guarín,

Padilla

2023

Braz. J. Develop.

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Se analizó comparativamente la formación de espray mediante CFD, en un inyector 4JH1 funcionando con diesel y biodiesel. Observando cavitación en la parte superior del orificio de entrada para ambos combustibles, siendo mayor con diesel, fenómeno atribuido por su mayor presión de vapor, las discrepancias en cavitación se vieron afectadas por la posición de levantamiento de aguja. El biodiesel presentó una mayor penetración, llegando a duplicar la del diesel los primeros , para posteriormente tender a igualarse con el tiempo. El ángulo de cono también presentó similitudes, siendo mayor con el diesel, y después de s tornándose similares, siendo ligeramente mayor con diesel. Se presentan cambios en la topografía del espray, algunos factores podrían evaluarse, para obtener una topología igual o una optimizada a las características fisicoquímicas del biodiesel empleado.

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Numerical simulation of impinging spray characteristics under high ambient pressures with an improved droplet collision model

Cited by 18 publications

References 33 publications

Experimental investigation on collision characteristics of dual-spray with different physical-chemical fuel properties: A case study of butanol-biodiesel fuel combination

Experimental investigation on collision characteristics of dual-spray with different physical-chemical fuel properties: A case study of butanol-biodiesel fuel combination

Simulation of Mass and Heat Transfer of Droplets Collision in a Flash Evaporation Pattern

Análisis comparativo de la formación de espray diesel y biodiesel en una boquilla 4JH1 mediante cfd

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