Experimental study on droplet breakup and droplet particles diffusion of a pressure nozzle based on PIV

Zhou, Gang; Wang, Junpeng; Song, Ruixin; Xu, Cuicui; Wang, Pengfei

doi:10.1016/j.ces.2022.117737

Cited by 13 publications

(3 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that an increased cone expansion leads to a decreased breakup length, providing further explanation for the inverse relationship between spray cone angle and breakup length. The fitting curve exhibits R 2 values greater than 0.95, with a relatively small difference between R 2 and adjusted R 2 (0.00595 and 0.02359 respectively), indicating a good fit [16] . The specific expressions of the fitting curve are shown in equations 1 and 2.…”

Section: Characteristics Of the Spray Droplets Velocity Distributionmentioning

confidence: 95%

Experimental study on the spray characteristics of low mass flow pressure swirl nozzles

Zhang,

Kai,

et al. 2024

Preprint

View full text Add to dashboard Cite

Pressure swirl nozzles with small mass flow are severed as starting nozzles and their spray characteristics directly affect the ignition performance in the combustion chamber. In order to adapt to different combustion chambers and to clarify the spray laws of nozzles with different spray cone angles, experimental studies have been carried out on the spray cone angle, the breakup length, the droplet velocity field, and the droplet size distribution characteristics for two nozzles. The results show that with the increase in injection pressure, the spray cone angle increases and then tends to slow down, the liquid film breakup length and droplet size decreases, the droplet velocity decreases as the increase in axial distance, the droplet velocity decay rate of the outside of the cone is higher than that of the droplets at the center axis position. Under the same working conditions, as the spray cone angle increases, the sprayed droplet size decreases but its uniformity improves, and the droplet velocity near the center axis of the spray field of the smaller spray angle cone nozzle increases significantly. From a theoretical point of view, it is shown that the conical liquid film breakup length becomes smaller for nozzles with large spray cone angles at the same flow rates.

show abstract

Section: Characteristics Of the Spray Droplets Velocity Distributionmentioning

confidence: 95%

Experimental study on the spray characteristics of low mass flow pressure swirl nozzles

Zhang,

Kai,

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Zhou et al used the PIV technology and PDI technology to study the spray atomization theory of the X-swirl pressure nozzle. Further, the turbulence characteristics were used to characterize the breakup process of droplets in the spray field and the influence on the particle size distribution [7] . Venkat et al employed the PIV to measure the instantaneous and average droplet velocity field in the far-field region of the spray [8] .…”

Section: Introductionmentioning

confidence: 99%

Spray droplet field reconstruction based on synthetic aperture imaging

Qu,

Liu,

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target Recognition

View full text Add to dashboard Cite

Quantitative analysis of spray droplet fields plays a pivotal role in various domains, encompassing internal combustion engine combustion diagnostics, equipment spray coating and corrosion prevention, and unmanned aerial vehicle-based agricultural pesticide dispersion. Precise measurement of the spatial distribution of spray droplet fields facilitates accurate control and orientation of spraying, thereby propelling the intelligent evolution of both industrial and agricultural sectors. In light of the substantial dimensions of spray fields, achieving focused imaging of all droplets on the camera imaging plane during reconstruction proves unattainable. Addressing this challenge, this study suggests employing a four-camera array configuration. According to the characteristics of the defocusing blur of spray droplets, the cameras on the array capture images of the droplets from diverse perspectives. Subsequently, these images are merged through a refocusing process. This method offers accurate extraction of out-of-focus droplet centers. Employing three-dimensional cross-correlation analysis, the motion trajectories of the spray droplet field can be inferred with precision.

show abstract

“…Spray, as a medium consisting of a liquid phase dispersed in a gaseous environment, is a natural candidate for PIV diagnostics. It has been used to verify the function of new types of atomiser [13], or to monitor and describe the liquid breakup for different types of atomisers [14,15]. This method can be used to track the motion of liquid particles in sprays [16] as the well as velocity fields in the surrounding gas [18].…”

Section: Introductionmentioning

confidence: 99%

Multi-Exposure PIV Measurements of Velocity Fields in Sprays

2022

View full text Add to dashboard Cite

This paper presents an approach to the use of the PIV method in the diagnosis of sprays generated by an effervescent atomiser. Due to the different density of the liquid phase depending on the distance from the nozzle, problems arise with the correct exposure of images for PIV analysis. The aim of the authors of this paper is to outline the possibility of solving this problem by composing a velocity field from partial measurements. To meet the objectives of the paper, in-house PIV equipment (hardware and software) was used rather than a commercial setup. This allowed for easier handling of the measured data and more sophisticated post-processing than offered by commercial products. It is clear from the results presented that, despite the fundamental differences in the optical properties of the spray particles, it is possible to obtain a velocity field from the discharge zone to the spray region with fine droplets. Moreover, it is possible to combine velocity measurements in the spray cone with measurements in the surrounding environment. Research background: Spray is an environment with an abundance of tracers for PIV analysis (droplets), but their density, size and shape vary dramatically with distance from the nozzle. The use of PIV can therefore be challenging due to the demands of this method for correct image exposure. Purpose of the article: Introduction of the application of the PIV method for environments with variable density and size of tracer particles Methods: PIV, image processing. Findings & Value added: By taking an appropriate approach to acquiring the source PIV images, it is possible to obtain information about the velocities throughout the spray cone as well as in the surrounding environment. The application of the proposed method requires a sufficiently large source data set (images) and sophisticated postprocessing. However, as a result, it is possible to obtain an overall view of the velocity field in the spray cone starting from the area behind the nozzle to the fine droplet region.

show abstract

Experimental study on droplet breakup and droplet particles diffusion of a pressure nozzle based on PIV

Cited by 13 publications

References 29 publications

Experimental study on the spray characteristics of low mass flow pressure swirl nozzles

Experimental study on the spray characteristics of low mass flow pressure swirl nozzles

Spray droplet field reconstruction based on synthetic aperture imaging

Multi-Exposure PIV Measurements of Velocity Fields in Sprays

Contact Info

Product

Resources

About