Investigation on fuel adhesion characteristics of wall-impingement spray under cross-flow conditions

Zhang, Gengxin; Shi, Penghua; Luo, Hongliang; Ogata, Yoichi; Nishida, Keiya

doi:10.1016/j.fuel.2022.123925

Cited by 12 publications

(7 citation statements)

References 41 publications

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“…Meanwhile, the adhesion shape gradually tended to be stretched with cross flow. Compared with the horizontal flat wall [37], adhesion was thicker at the actual impinging position, and thinner downstream and at the edge regions when the spray impinged upon the inclined wall. When the cross-flow intensity was not so strong, the adhesion area increased as cross-flow intensity increased.…”

Section: Formation and Expansion Of Fuel Adhesionmentioning

confidence: 78%

“…The image processing procedure is shown Figure 5, and detailed information regarding it can be found in [37]. In this work, adhesive fuel features were obtained to evaluate the degree of fuel adhesion.…”

Section: Image Processing For Fuel Adhesionmentioning

confidence: 99%

“…A contributive factor was proposed to assess the influence degree of cross flow on vortex structures, and the vortex core height could be greatly increased with a cross-flow effect at a higher ambient pressure. Subsequently, the fuel-adhesion mechanism was revealed with a horizontal flat wall in the cross-flow field [37]. Results demonstrated that fuel adhesion alternated between the thick and thin regions.…”

Section: Introductionmentioning

confidence: 97%

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Experimental Study on the Adhesive Fuel Features of Inclined Wall-Impinging Spray at Various Injection Pressure Levels in a Cross-Flow Field

et al. 2023

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The wall-impingement phenomenon significantly impacts mixture formation, combustible performance, and pollutant release in DISI engines. However, there is insufficient knowledge regarding the behavior of fuel adhesion. Thus, here, we examine adhesive fuel features at various injection pressure levels (5 and 10 MPa) in a cross-flow field (0 to 50 m/s). The RIM optical method was employed to track the expansion and distribution of fuel adhesion. As a result, adhesive fuel features such as area, mass, thickness, and lifetime were assessed. Postprocessing image analysis reveals that fuel adhesion was consistently thinner at the edge region. With increased injection pressure, the cross flow led to a rise in the fuel-adhesion area and mass; however, small changes in pressure did not affect adhesive thickness. Adhesive thickness significantly decreased in the cross flow, indicating enhanced evaporation potential. Furthermore, lifetime prediction was conducted to quantitatively evaluate the impact of cross flow and injection pressure upon fuel adhesion, which could be calculated by examining the decreasing trend in adhesive area. Results show that the lifetime was dramatically reduced with higher cross-flow velocity, and slightly decreased with lower injection pressure. Under injection pressure of 10 MPa, the adhesive lifetime in the cross-flow field of 50 m/s was reduced by 77.5% compared with the static flow field (0 m/s). The experimental results provide corresponding guidance for low-carbon fuel utilization and emission reduction in DISI engines.

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Section: Formation and Expansion Of Fuel Adhesionmentioning

confidence: 78%

Section: Image Processing For Fuel Adhesionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Experimental Study on the Adhesive Fuel Features of Inclined Wall-Impinging Spray at Various Injection Pressure Levels in a Cross-Flow Field

et al. 2023

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“…The PDIA system has been widely used to deliver a visual microscopic spray structure and characterize the droplet. [40][41][42] With regard to the PDIA system, a double-pulsed Nd:YAG laser serves as the light source, and a CCD camera linked with a long-distance microscope is used to capture the shadow image, as shown in Figure 1. The pulse energy of laser is 200 mJ and the wavelength is 532 nm.…”

Section: Methodsmentioning

confidence: 99%

Experimental study on dribbling characteristics of gasoline/biodiesel blends after the end-of-injection

Feng,

Yang,

Jin

et al. 2023

International Journal of Engine Research

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The effects of biodiesel addition on gasoline fuel dribbling process and characteristics after the end-of-injection (EOI) were investigated in a constant volume chamber at different injection pressures and ambient temperatures. The fuel dribbling process was recorded with high spatial and time resolution by using the microscopic shadow imaging technique, and the corresponding dribble velocity, dribble volume and droplet size were extracted. The results showed that the fuel dribbling experienced four typical morphological structures (spray-like, membrane-type, ligament-type, droplets) after the EOI under all the tested conditions. Additionally, increased biodiesel proportion in the blends caused decreased dribble velocity, longer dribbling duration, and increased droplet size, indicating deteriorated breakup and atomization processes of the dribbling flow. Moreover, the higher injection pressure increased the dribble amount but reduced the dribbling duration and droplet size. The increased ambient temperature caused faster evaporation of the dribbling fuel, resulting in a significant decrease in the dribble size. So, these two strategies were believed to be overall favorable to restrain the adverse effect on gasoline fuel dribbling characteristics caused by the addition of biodiesel.

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“…Surface tension is another determinant factor that influences the atomization as it signifies the energy amount needed to increase bubbles [152][153][154][155]. While surface tension affects the fuel surface area, volatility influences the spray evolution and mixture formation [114,[156][157][158][159]. High volatile fuel tends to increase the evaporation rate and lowers SMD thus reducing the spray penetration length [160][161][162][163][164][165].…”

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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Investigation on fuel adhesion characteristics of wall-impingement spray under cross-flow conditions

Cited by 12 publications

References 41 publications

Experimental Study on the Adhesive Fuel Features of Inclined Wall-Impinging Spray at Various Injection Pressure Levels in a Cross-Flow Field

Experimental Study on the Adhesive Fuel Features of Inclined Wall-Impinging Spray at Various Injection Pressure Levels in a Cross-Flow Field

Experimental study on dribbling characteristics of gasoline/biodiesel blends after the end-of-injection

Diesel Spray: Development of Spray in Diesel Engine

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