Optical experimental study on cavitation development with different patterns in diesel injector nozzles at different fuel temperatures

Cao, Tianyi; He, Zhixia; Si, Zhanbo; EL‐Seesy, Ahmed I.; Guan, Wei; Zhou, Han; Wang, Qian

doi:10.1007/s00348-020-03006-5

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…significantly varies accordingly, which only changes the intensity of the needle-originated string cavitation, but its structure remains stable. 37 Based on this, this experiment focuses on exploring the effect of ventilation content on its structure. Figure 9 shows the variation of the needle-originated string cavitation intensity and the spray angle with 0.65 MPa injection pressure and 1.0 × 10 −3 m needle lift.…”

Section: Resultsmentioning

confidence: 99%

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

Cao

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Aiming at the complicated vortex problem that affects the flow stability of diesel engine nozzles, this paper focuses on the effect of ventilation on the string cavitation patterns in the nozzle hole with a self-built scale-up test bench. Hole-to-hole string cavitation is not stable without bubbles, and the ventilation can improve the situation. Relatively speaking, the position of hole-to-hole string cavitation in the SAC volume changes significantly with the bubble content. In contrast, the needle-originated string cavitation is stable in the vortex channel. Only if there are many bubbles, the cavitation pattern changes to hole-to-hole string cavitation or string cavitation originating from the upper wall of the hole inlet. At this point, the corresponding atomization morphology changes, and the spray angle decreases significantly. It is verified that there is a one-to-one correspondence between the cavitating pattern and the spray angle near the hole.

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Section: Resultsmentioning

confidence: 99%

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

Cao

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Hot ambient air inside the cylinder could improve the evaporation of the spray outer periphery and consequently decreasing the spray cone angle [39,107,[120][121][122]. Increasing ambient temperature could lead to enhanced evaporation rate and thus considerably shorten the spray penetration length [123][124][125][126][127].…”

Section: Factors Affecting Spray Evolutionmentioning

confidence: 99%

“…Higher fuel temperature tends to produce vapor bubble and this phenomenon is known as cavitation [125,132,133]. In the liquid fuel injection behavior, cavitation combined with turbulence can improve spray performance in terms of the liquid atomization, droplets breakup and air entrainment.…”

Section: Factors Affecting Spray Evolutionmentioning

confidence: 99%

Diesel Spray: Development of Spray in Diesel Engine

Djamari

Idris²,

Paristiawan³

et al. 2022

Sustainability

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Research and development in the internal combustion engine (ICE) has been growing progressively. Issues such as air pollution, fuel cost, and market competitiveness have driven the automotive industry to develop and manufacture automobiles that meet new regulation and customers’ needs. The diesel engine has some advantages over the gasoline or spark ignition engine, including higher engine efficiency, greater power output, as well as reliability. Since the early stage of the diesel engine’s development phase, the quest to obtain better atomization, proper fuel supply, and accurate timing control, have triggered numerous innovations. In the last two decades, owing to the development of optical technology, the visualization of spray atomization has been made possible using visual diagnostics techniques. This advancement has greatly improved research in spray evolution. Yet, a more comprehensive understanding related to these aspects has not yet been agreed upon. Diesel spray, in particular, is considered a complicated phenomenon to observe because of its high-speed, high pressure, as well as its high temperature working condition. Nevertheless, several mechanisms have been successfully explained using fundamental studies, providing several suggestions in the area, such as liquid atomization and two-phase spray flow. There are still many aspects that have not yet been agreed upon. This paper comprehensively reviews the current status of theoretical diesel spray and modelling, including some important numerical and experimental aspects.

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“…Unfortunately, it is rare to explore the relationship between fuel temperature and cavitation in the hole. 39 Based on the basis of previous studies, 40 the occurrence and development of geometry-induced cavitation and string cavitation at different fuel temperatures and special cavitating phenomena were comparatively studied in this paper. The data obtained are rich and reliable in the experimental study, providing real and effective data support for cavitating model and atomization mechanism, and providing a brand-new theoretical background for the new generation of high hydraulic and mini-type injector.…”

Section: Introductionmentioning

confidence: 99%

Investigation of cavitation phenomenon with different fuel temperatures in diesel nozzles

Cao,

He,

Wang

2023

Advances in Mechanical Engineering

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Two-phase cavitating flow in the diesel nozzle has been widely concerned by researchers for a long time. Most of the attention has been paid to irregular geometry-induced cavitation, while the research on string cavitation induced by vortex is relatively less. The two cavitating patterns often occur simultaneously in the nozzle, which are still not understandable for their interaction characteristics. In this paper, it is analyzed that the characteristics of string cavitation and geometry-induced cavitation in the transparent nozzle based on the visual scale-up test bench. In the study of hole-to-hole string cavitation, it is found that when needle lifts elevate, geometry-induced cavitation and hole-to-hole string cavitation are observed all together under the same working condition. The development and stability of hole-to-hole string cavitation are further improved with the increase of fuel temperature. The geometry-induced cavitation and string cavitation interact with each other, that is, geometry-induced cavitation at the nozzle inlet interrupts the hole-to-hole string cavitation inception. The tail of hole-to-hole string cavitation is disturbed by cloud cavitation shedding after its developing into the nozzle hole, leading to fracture in serious cases. At high temperatures, there is a periodic transformation between the needle-originated string cavitation and hole-to-hole string cavitation.

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Optical experimental study on cavitation development with different patterns in diesel injector nozzles at different fuel temperatures

Cited by 14 publications

References 36 publications

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

Diesel Spray: Development of Spray in Diesel Engine

Investigation of cavitation phenomenon with different fuel temperatures in diesel nozzles

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