Time-resolved droplet size and velocity distributions in a dilute region of a high-pressure pulsed diesel spray

Feng, Zehao; Tang, Chenglong; Yin, Yue; Zhang, Peng; Huang, Zuohua

doi:10.1016/j.ijheatmasstransfer.2018.12.147

Cited by 42 publications

(7 citation statements)

References 29 publications

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“…Early studies of diesel sprays have shown the droplet size distributions to be highly skewed, which can be represented by Rosin and Rammler (1933), logarithmic normal (Mugele and Evans, 1951), Nukiyama and Tanasawa (1939), or Chi-square distributions (Hiroyasu and Kadota, 1974). In recent investigations, lognormal distributions were found to be suitable for diesel sprays (Feng et al, 2019).…”

Section: Droplet Size Distributionmentioning

confidence: 99%

A Reduced-order Model for Multiphase Simulation of Transient Inert Sprays

Deshmukh,

Grenga,

Davidovic

et al. 2021

Preprint

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In global efforts to reduce harmful greenhouse gas emissions from the transportation sector, novel bio-hybrid liquid fuels from renewable energy and carbon sources can be a major form of energy for future propulsion systems due to their high energy density. A fundamental understanding of the spray and mixing performance of the new fuel candidates in combustion systems is necessary to design and develop the fuels for advanced combustion concepts. In the fuel design process, a large number of candidates is required to be screened to arrive at potential fuels for further detailed investigations. For such a screening process, three-dimensional (3D) simulation models are computationally too expensive and hence unfeasible. Therefore, in this paper, we present a fast, reduced-order model for inert sprays.The model is based on the cross-sectionally averaged spray (CAS) model derived by Wan (1997) from 3D multiphase equations. The original model was first tested against a wide range of conditions and different fuels. The discrepancies between the CAS model and experimental data are addressed by integrating state-of-the-art breakup and evaporation models. In addition, a transport equation for vapor mass fraction is proposed, which is important for evaporation modeling. Furthermore, the model is extended to consider polydispersed droplets by modeling the droplet size distribution by commonly used presumed probability density functions, such as Rosin-Rammler, lognormal, and gamma distributions. The improved CAS model is capable of predicting trends in the macroscopic spray characteristics for a wide range of conditions and fuels. The computational cost of the CAS model is lower than the 3D simulation methods by up to 6 orders of magnitude depending on the method. This enables the model to be used not only for the rapid screening of novel fuel candidates, but also for other applications, where reduced-order modeling is useful.

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Section: Droplet Size Distributionmentioning

confidence: 99%

A Reduced-order Model for Multiphase Simulation of Transient Inert Sprays

Deshmukh,

Grenga,

Davidovic

et al. 2021

Preprint

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“…It is also very important to demonstrate the spray and atomization characteristics of the gasoline/biodiesel blends in direct injection mode because the changed fuel physicochemical properties may influence the spray macroscopic development and the droplet size and quality which critically impact the fuel-air mixing, combustion process and emissions. 2,[22][23][24][25][26] Das et al 27 experimentally studied the non-vaporizing spray and atomization characteristics of biodiesel-blended gasoline fuel in a constant volume chamber. They reported that fuels with different blending ratios experienced significant differences in shapes during spray evolution and with the increase of gasoline proportion, the spray tip penetration decreased and the spray cone angle increased.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on dribbling characteristics of gasoline/biodiesel blends after the end-of-injection

Feng,

Yang,

Jin

et al. 2023

International Journal of Engine Research

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The effects of biodiesel addition on gasoline fuel dribbling process and characteristics after the end-of-injection (EOI) were investigated in a constant volume chamber at different injection pressures and ambient temperatures. The fuel dribbling process was recorded with high spatial and time resolution by using the microscopic shadow imaging technique, and the corresponding dribble velocity, dribble volume and droplet size were extracted. The results showed that the fuel dribbling experienced four typical morphological structures (spray-like, membrane-type, ligament-type, droplets) after the EOI under all the tested conditions. Additionally, increased biodiesel proportion in the blends caused decreased dribble velocity, longer dribbling duration, and increased droplet size, indicating deteriorated breakup and atomization processes of the dribbling flow. Moreover, the higher injection pressure increased the dribble amount but reduced the dribbling duration and droplet size. The increased ambient temperature caused faster evaporation of the dribbling fuel, resulting in a significant decrease in the dribble size. So, these two strategies were believed to be overall favorable to restrain the adverse effect on gasoline fuel dribbling characteristics caused by the addition of biodiesel.

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“…There is a definition for jet flows (Ferrand et al, 2003), while it cannot be used for, e.g., pressure-swirl atomizers. A simple approach is to use the particle size as a characteristic flow length scale, which inherently leads to enormous Stk values (Feng et al, 2019). This, however, does not ultimately mean that they poorly follow the bulk flow.…”

Section: Introductionmentioning

confidence: 99%