Effect on flash boiling spray characteristics in the far-field and near-field and nozzle tip wetting with multi-hole LPDI injector

Yu, Young Soo; Shin, Dongheon; Jeong, Minuk; Park, Jeong Hwan; Park, Sungwook

doi:10.1016/j.applthermaleng.2022.119676

Cited by 9 publications

(6 citation statements)

References 31 publications

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“…10. To illustrate the validity of this criterion, the data obtained from Soo Yu et al (2023) and Rees et al (2020) are also displayed. It is observed that this criterion shows well agreement with the results of n-heptane and n-butane, but it predicts flashing onset of liquid nitrogen early due to the difference in material properties.…”

Section: Determination Of Flashing Regionsmentioning

confidence: 99%

“…The transition occurred from mechanical atomization to fully flashing, characterized by a substantial bell-shaped angle. Recently, Soo Yu et al (2023) compared the spray characteristics of n-heptane and liquefied petroleum gas fuel across different flashing situations. Results showed that the increase in superheat expanded the spray plume of both types of fuel in the central axial direction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Categorization of iso-pentane flashing spray based on morphology, thermodynamical and mechanical effects

Lin,

Zhu,

Zhou

et al. 2024

International Journal of Multiphase Flow

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Section: Determination Of Flashing Regionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Categorization of iso-pentane flashing spray based on morphology, thermodynamical and mechanical effects

Lin,

Zhu,

Zhou

et al. 2024

International Journal of Multiphase Flow

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“…If G100 is considered, the spray angle features a maximum at around 75 • C, while the G70, G50 and G0 patterns of the spray angle curves generally increase in a comparable way up to 120 • C and local maximum points occur around 130 • C. When the flash-boiling condition occurs, that is, around 75 • C for G100 and around 120-130 • C for the other mixtures, a large amount of vapor is generated just after the injection. Consequently, the flashing boiling leads to a large vapor bubble formation inside the liquid spray [39]. The vapor bubbles suddenly explode, leading to an increment in the radial momentum, which augments the spray angle and makes the spray shape more irregular.…”

Section: Effect Of Injection Temperature On Spray Anglementioning

confidence: 99%

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

Ji,

Wu,

Ferrari

et al. 2023

Energies

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Gasoline–water mixed injections are of great interest because of their advantages for reduced manufacturing costs and improved atomization, with the potential to alleviate engine detonation and reduce emissions. In this work, based on the principle of impinging flow, a real-time gasoline–water mixture preparation system for internal combustion engines was designed and the preparation system performance was compared with the standard swirl mixing technique. An image processing method was established to quantify the uniformity of the prepared mixture. Based on the flash-boiling spray flash-boiling spray experiment, the spray characteristics of different gasoline–water mixtures were analyzed under different injection temperatures (30–160 °C) and pressures (5–15 MPa). The experiments showed that the impinging pressure was the main factor affecting the emulsification performance of the real-time gasoline–water mixture, and that the proposed real-time mixing system could produce a stable gasoline–water emulsion. For temperatures in the 30–160 °C range, the flash-boiling spray flash-boiling spray experiments showed that the spray penetration distance first decreases and then increases with the injection temperature, while the spray angle shows an opposite trend. The turning point corresponded to the flash-boiling point of each gasoline–water mixture.

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“…Spray technology uses high-speed jets or swirl jets and other methods to break liquid into small particlesize droplets, and then apply them to internal combustion engines, aerospace engines, heat dissipation, spraying, etc. [1][2][3][4]. The fluid with a low boiling point is more likely to overheat under the conditions of rising ambient temperature or sudden pressure drop so that the spray fluid will flash evaporation, which will enhance the mechanical breakage of the spray fluid, and affect the atomization effect and the penetration distance of the fluid.…”

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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Effect on flash boiling spray characteristics in the far-field and near-field and nozzle tip wetting with multi-hole LPDI injector

Cited by 9 publications

References 31 publications

Categorization of iso-pentane flashing spray based on morphology, thermodynamical and mechanical effects

Categorization of iso-pentane flashing spray based on morphology, thermodynamical and mechanical effects

Experimental Investigation on Gasoline—Water Mixture Fuel Impingement Preparation Method and Spray Characteristics with High Injection Temperatures and Pressures

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

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