Experimental study of injection characteristics under diesel’s sub/trans/supercritical conditions with various nozzle diameters and injection pressures

Xia, Jin; Zhang, Qiankun; Huang, Zhong; Ju, Dehao; Lü, Xingcai

doi:10.1016/j.enconman.2020.112949

Cited by 30 publications

(16 citation statements)

References 43 publications

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“…This indicates that spray under small nozzle diameters has fewer droplets, which is easier to breakup and faster to evaporate. 26 Figure 4(c) shows the variation of spray liquid length of D100 and D300 with the increase of spray pressure. It can be found that the liquid length has no obvious change trend with the increase of injection pressure.…”

Section: Resultsmentioning

confidence: 99%

“…The pressure and temperature of supercritical environment are above the critical value of the fuel. Previous studies have described the spray atomization of diesel 25,26 and its substitutes 27,28 under different critical conditions in detail, focusing on “sprays in different critical environments.” According to the previous definition, 25 “subcritical condition” means that both ambient pressure and temperature are below the critical value of the fuel. “Transcritical ( P or T ) condition” means ambient pressure ( P ) or temperature ( T ) exceeds its critical value.…”

Section: Introductionmentioning

confidence: 99%

“…Although a lot of efforts have been made, researchers investigate the influence of injection pressure and nozzle diameter under different critical conditions rarely. The previous work 26 studied the effects of injection pressure and nozzle diameter on the spray characteristics of diesel under sub/trans/supercritical conditions. The results showed that the spray development under a small nozzle diameter was more susceptible to ambient gas entrainment, which was promoted by the increase of injection pressure.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigations of aviation kerosene spray in different ambient conditions with various nozzle diameters and injection pressures

Wang

Zhang

Xia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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The purpose of this study is to explore the spray characteristics of aviation kerosene (RP-3) under sub/trans/supercritical conditions and provide a reference for engine test research under advanced combustion mode. The experiment is carried out in a constant volume chamber. To understand the influence of nozzle diameter and injection pressure on spray characteristics of RP-3 under different critical conditions, 270 groups of spray images are collected under three nozzle diameters (100, 300, 450 μm), five injection pressures (60, 80, 100, 120, 140 MPa), and nine critical conditions. The macroscopic parameters are calculated and new empirical correlations are generated to investigate the axial and radial development of spray. The results show that kerosene spray has different spray characteristics under sub/trans/supercritical conditions. The effect of nozzle diameter on kerosene spray is stronger than that of diesel spray. The spray with a small nozzle diameter is easily affected by gas entrainment. The injection pressure has an insignificant effect on spray macroscopic characteristics, but high injection pressure is conducive to increasing the vapor phase ratio and promoting oil-gas mixing, especially under supercritical conditions. The new correlations have good agreement with kerosene experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigations of aviation kerosene spray in different ambient conditions with various nozzle diameters and injection pressures

Wang

Zhang

Xia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…31 Subsequent droplets continue to push forward and overlap into a denser mixture. 51 Because of the high ambient pressure of 5 MPa, the outcome of off-axis collision decreases but the bouncing collision increases, especially for the collision angle of 150°. Comparing the collision ''c'' with collision ''d,'' both schlieren images show a similar overall structure.…”

Section: Structure At Various Collision Anglesmentioning

confidence: 99%

Experimental study of the effect of various collision angles and critical conditions on marine engine’s twin-spray collision process

Xia

Zhang

Wang

et al. 2022

International Journal of Engine Research

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To enhance the fuel-gas mixing and phase transition process, the fuel is injected by twin injectors in a large-bore low-speed two-stroke marine engine, while the cylinder condition has reached the transcritical and supercritical conditions. The twin-injector configuration has a great potential for further optimization, but the exploration on the outcome of collision and phase transition was still limited. Therefore, this work aims to study the effect of various collision angles (60°, 90°, 120°, 150°) and critical conditions (sub/trans/supercritical) on the twin-spray collision process using optical techniques. A wide range of experimental cases are conducted to provide an analysis and database for future modeling validation. The post-collisional spray structures, spatial distribution, and periphery features are analyzed to characterize the droplet’s collision. The results show that with the collision angle increasing, the higher collision velocity enhances the mass transfer while the minor vertical component results in a smaller axial dispersion. Because of the trade-off relationship between the vertical velocity component and pre-collision penetration, a higher reduction in droplet momentum results in a slighter collision behavior. At the collision angle of 150°, the subcritical condition tends to result in an off-axis collision. Under the transcritical (P) condition, the probability of head-on collision increases and presents a wider spatial distribution. But under the supercritical condition, because of the existence of the liquid collision, the thermal conversion among phases is accelerated, while the ambient resistance is reduced. Moreover, an exponential correlation of collision liquid length is formulated to predict the axial dispersion based on various critical conditions.

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“…As a result, the maximum ambient pressure and temperature in combustion chambers of modern engines are getting higher and higher, which tend to exceed the critical points of injected fuels [4][5][6], especially in compression ignition engines [7,8]. Once the ambient reaches the critical conditions, the dominant mixing mode of the fuel may transition from evaporation to diffusion [9][10][11][12], which strongly influences the subsequent combustion and formation of pollutants [13][14][15][16][17].…”

mentioning

confidence: 99%

Atomic-level insights into transition mechanism of dominant mixing modes of multi-component fuel droplets: From evaporation to diffusion

Gong

Luo

et al. 2021

Fuel

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Experimental study of injection characteristics under diesel’s sub/trans/supercritical conditions with various nozzle diameters and injection pressures

Cited by 30 publications

References 43 publications

Experimental investigations of aviation kerosene spray in different ambient conditions with various nozzle diameters and injection pressures

Experimental investigations of aviation kerosene spray in different ambient conditions with various nozzle diameters and injection pressures

Experimental study of the effect of various collision angles and critical conditions on marine engine’s twin-spray collision process

Atomic-level insights into transition mechanism of dominant mixing modes of multi-component fuel droplets: From evaporation to diffusion

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