Dense-field spray droplet size quantification of flashing boiling atomization using structured laser illumination planar imaging technique

Qiu, Shuyi; Wang, Shangning; Zhang, Yijia; Li, Xuesong; Hung, David L.S.; Xu, Min

doi:10.1016/j.fuel.2022.127085

Cited by 14 publications

(3 citation statements)

References 37 publications

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“…Droplet distribution and velocity component statistics resulting from the primary breakup (see Section 2.2.2) play a crucial role in determining the spray quality. However, due to the dense population of droplets near the nozzle exit, it is very difficult to analyze the cloud optically [50]. Quantifying these statistics using optical diagnostic instruments is quite challenging, in particular where a flash billing spray is involved, as a faster breakup leads to a higher concentration of droplets.…”

Section: Diagnostics Aspectsmentioning

confidence: 99%

Advances in Liquid Atomization via Flash Boiling—A Global Overview

Bar-Kohany,

Arogeti,

Malka

et al. 2023

Energies

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A wide range of recent applications require high-quality sprays that are characterized by extremely small-sized droplets, a narrow droplet size distribution, and a short breakup length. Fuel injection systems in propulsion units, energy storage, medical implementations, printings, and coatings are just a few examples. Flash-boiling atomization is a unique method that was extensively developed during the past two to three decades and has been proven to generate high-quality demanded sprays. In flash-boiling atomization, the liquid is forced to reach a metastable superheated state by either rapid heating or rapid pressure drop, where vapor bubbles nucleate, become fast-growing, and subsequently break down the liquid into a fine spray in a very short time. This present article focuses on flash-boiling atomization via rapid depressurization, which is presently more relevant to energy systems. The field of flash-boiling atomization has seen rapid growth and popularity in the past two decades. The aim of this article is to quantitatively portray the landscape and evolutionary trajectory of flash-boiling atomization research and applications and to detect new research frontiers and emerging trends in the literature on flash-boiling atomization. We briefly review the basic theories of the flash-boiling atomization mechanism present a comprehensive overview of the field, from its birth in approximately the 1970s to the present, and provide a database comprising 386 articles published on the topic of flash-boiling atomization. We visualize the intellectual structure of flash-boiling atomization research and applications and track its evolvement over the past five decades, thus providing a global overview and a comprehensive understanding of the development of flash-boiling atomization research and emerging applications.

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Section: Diagnostics Aspectsmentioning

confidence: 99%

Advances in Liquid Atomization via Flash Boiling—A Global Overview

Bar-Kohany,

Arogeti,

Malka

et al. 2023

Energies

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“…Many studies have used high-speed cameras and image processing technology to observe the spray, focused on capturing the spray image when the flash occurs, and used the obtained post-processing spray image to study the penetration of the fuel flash spray [7], far-field and near-field spray parameter fluctuations [8] and so on. To measure the parameters of spray droplets more accurately, Mie-scattering [9] and phase Doppler interferometry (PDI) techniques [10] are used to measure the flash spray droplet velocity and particle size. In addition to experimental measurement methods, some studies also use simulation methods to study flash spray [11].…”

Section: Introductionmentioning

confidence: 99%

Experiment and simulation study on the characteristics of pressure swirl nozzle flash spray under the influence of superheat

Zheng,

Xu,

et al. 2024

J. Phys.: Conf. Ser.

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The good atomization performance of the pressure swirl nozzle makes it widely used in the fuel injection device of the internal combustion engine. Flash spray caused by fuel inlet superheat can affect spray and combustion characteristics. In this paper, a spray parameter measurement system is set up, combined with phase Doppler particle analysis (PDPA) technology to research the effect of superheat on spray velocity and droplet diameter distribution. To improve the safety of the experiment, Methyl Nonafluorobutyl Ether (HFE7100) with a boiling point of 61°C was used as the spray fluid. The cavitation model and VOF model are used to simulate the pressure swirl nozzle flash spray. The results show that when the temperature changes from 40°C to 60°C, the velocity of spray droplets increases and the particle size decreases under the action of weak evaporation; When the temperature changes from 60°C to 70°C, the evaporation mode is dominated by flash, making the droplet velocity at the spray center greatly increase and the velocity distribution change from saddle-shaped distribution to unimodal distribution. The droplet diameter increases, which may be due to the expansion of the droplet caused by the formation of bubbles inside the droplet under the action of flash.

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“…As a well-established droplet size measurement method, PDI can also be used for the development and validation of novel diagnostics methods. For instance, Qiu et al [7] used PDI to calibrate and verify the self-developed SLIPI-LIEF/Mie method, which is a novel planar droplet sizing technique.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic and Microscopic Characteristics of a GDI Spray Under Various Thermodynamic Conditions

Li,

Xiao

et al. 2023

IJAMM

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Article Macroscopic and Microscopic Characteristics of a GDI Spray Under Various Thermodynamic Conditions Jian Li 1, Lulu Li 1, Rujie Xiao 1, Yuanfei Liang 1, Shuyi Qiu 2, and Xuesong Li 2,* 1 SAIC GM Wuling Automobile Co., Ltd., 18 Hexi Rd, Liunan District, Liuzhou 545001, China 2 School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China * Correspondence: xuesonl@sjtu.edu.cn Received: 12 June 2023 Accepted: 9 August 2023 Published: 28 August 2023 Abstract: Gasoline direct injection (GDI) is the most common and advanced fuel supply strategy for gasoline engines. The fuel atomization quality and fuel/air mix degree determine the subsequent combustion efficiency and emissions. However, the engine works in complex conditions which have numerous thermodynamic boundary conditions, and the characteristics of fuel atomization also change accordingly. It is necessary to clarify the influence of various thermodynamic conditions on the GDI spray. In this work, three different types of optics diagnostic methods were utilized to capture the macroscopic and microscopic characteristics of a commercial GDI injector spray under various thermodynamic boundary conditions. Specifically, Mie-scattering photography was employed to get the macroscopic parameters; planar Mie-scattering photography was utilized to get the spray pattern; phase Doppler interferometry (PDI) was used to get the microscopic characteristic, i.e., the droplet size distributions. It is found from this study that higher injection pressure, lower ambient pressure, and lower ambient temperature would lead to longer penetration and larger plume width. Lower ambient pressure and higher ambient temperature would cause a smaller spray pattern. Higher injection pressure, lower ambient pressure, and higher ambient temperature would result in smaller droplet sizes.

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Dense-field spray droplet size quantification of flashing boiling atomization using structured laser illumination planar imaging technique

Cited by 14 publications

References 37 publications

Advances in Liquid Atomization via Flash Boiling—A Global Overview

Advances in Liquid Atomization via Flash Boiling—A Global Overview

Experiment and simulation study on the characteristics of pressure swirl nozzle flash spray under the influence of superheat

Macroscopic and Microscopic Characteristics of a GDI Spray Under Various Thermodynamic Conditions

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