Experimental study on spray characteristics of six-component diesel surrogate fuel under sub/trans/supercritical conditions with different injection pressures

Zhang, Qiankun; Xia, Jin; He, Zhuoyao; Wang, Jianping; Li, Rui; Zheng, Liang; Ju, Dehao; Lü, Xingcai

doi:10.1016/j.energy.2020.119474

Cited by 29 publications

(10 citation statements)

References 57 publications

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“…According to our previous work, the liquid-core and liquid-phase penetration have similar variation laws, 30 and only the liquid-phase penetration is analyzed in this work. As shown in Figure 3, with the increase in the n-butanol proportion, the liquid-phase axial diffusion distance decreases except at the low pressure and temperature condition.…”

Section: Resultsmentioning

confidence: 99%

Experimental study on spray diffusion characteristics at various biodiesel-butanol blended ratios and ambient conditions

Zhang

Xia

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The depletion of fossil fuels and stringent emission regulations have encouraged the development of renewable fuels, especially biodiesel and alcohols fuels. The aim of the investigation is to explore the spray diffusion characteristics at different biodiesel-butanol blended ratios (0, 10%, 30%, 50%), ambient temperatures (600 K, 700K, 800 K) and pressures (1 MPa, 3MPa, 5 MPa). The experiment was carried out in a constant-volume combustion chamber. The liquid- and vapor-phase spray images were captured by backlight illumination and schlieren imaging technique, respectively. The axial, radial and spatial diffusion characteristics were analyzed, including spray penetration, cone angle, area, R-parameter and perimeter ratio. Results show that in the case of biodiesel mixed with 10% n-butanol, for liquid-phase spray, the liquid-core spray with high concentration has the largest impact on axial diffusion, and for vapor-phase spray, axial dispersion is slower and radial diffusion is faster. The fuel density and ambient temperature have a more significant impact on the liquid-phase axial dispersion at the steady-state compared with ambient pressure and injection pressure. At lower ambient pressures, increasing the injection pressure can accelerate the radial diffusion and increase the spray cone angle, which is opposite of the variation law at higher ambient pressures. The radial spray has a faster diffusion with adding a small or middle proportion of n-butanol, and the maximum values of liquid- and vapor-phase cone angles appear at biodiesel blended with 30% and 10% n-butanol, respectively. Moreover, the axial diffusion plays a dominant role in the spray spatial dispersion.

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Section: Resultsmentioning

confidence: 99%

Experimental study on spray diffusion characteristics at various biodiesel-butanol blended ratios and ambient conditions

Zhang

Xia

Wang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…To explore the twin-spray collisional periphery feature, the spray collision perimeter (CP) is usually used as a key parameter. 60,61 Figure 15(a) shows the liquid collision perimeter development after the start of collision for the collision ''d'' at 180 MPa injection pressure. As a total length of the collisional liquid periphery is recorded, it is expected that the collision perimeter has a similar variation to the collision liquid length as Figure 6(b) and collision liquid area as Figure 13, which means the collisional spray with a longer axial length and contour can enclose a larger area.…”

Section: Periphery Featurementioning

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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“…The local air entrainment rate around the spray boundary can be calculated by spray velocity and SCA, as shown in equation (1) [33][34][35] :…”

Section: Spray Tip Velocitymentioning

confidence: 99%

Experimental and numerical investigation on fuel/air mixing and macroscopic spray characteristics of free spray, convergent-divergent, and straight duct sprays under non-vaporizing conditions

Chen

et al. 2022

International Journal of Engine Research

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In this study, the convergent-divergent (CD) and straight (ST) duct sprays were conducted for comparison with free spray to investigate the diesel macroscopic spray characteristics and mixing process. The schlieren visualization system with a high-speed camera was performed with a 0.22 mm single-hole heavy-duty diesel injector. The injection pressure varied from 120 via 140 to 160 MPa, with the ambient pressure being set at 40 bar. The experimental result showed that CD and ST duct spray had much higher spray tip velocity compared to free spray during the early spray stage. CD duct spray presented a more dispersed and more distributed spray morphology along with larger-scale flow vortexes and gas entrainments, indicating the promoted fuel-air mixing process. Large-eddy simulations (LES) were conducted to analyze the pumping effect, the local separation of the boundary layer, and the air entrainment of different sprays. Compared with free spray, a much stronger pumping effect was generated for ST duct spray followed by CD duct spray; Less flow interaction with the spray body inside the ST duct, retaining more energy for spray development; A much stronger flow interaction was noted as the external gas was sucked into the expanding section of the CD duct, produce the local air vortexes in the narrow inner wall space of the CD duct, leading to the promoted spray diffusion and development with a wider spray cone angle. These phenomena from CD duct spray were beneficial for achieving a more sufficient fuel-air mixing process.

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Experimental study on spray characteristics of six-component diesel surrogate fuel under sub/trans/supercritical conditions with different injection pressures

Cited by 29 publications

References 57 publications

Experimental study on spray diffusion characteristics at various biodiesel-butanol blended ratios and ambient conditions

Experimental study on spray diffusion characteristics at various biodiesel-butanol blended ratios and ambient conditions

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

Experimental and numerical investigation on fuel/air mixing and macroscopic spray characteristics of free spray, convergent-divergent, and straight duct sprays under non-vaporizing conditions

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