Measurement of Liquid and Vapor Penetration of Evaporating Methanol Sprays

Ghosh, Anupam; Boggavarapu, Prasad; Ravikrishna, RV

doi:10.1615/atomizspr.2020034377

Cited by 6 publications

(4 citation statements)

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“…There are few reports on methanol spray under high-pressure injection conditions such as diesel injection. Anupam et al [29] used a simplified single-hole nozzle and carried out a test on the liquid phase penetration and vapor phase penetration characteristics of methanol spray under evaporation conditions, but the highest injection pressure reached only 48 MPa. The study found that ambient gas density and temperature had a great influence on the spray penetration of methanol vapor and the liquid phase.…”

Section: Property Diesel Methanolmentioning

confidence: 99%

Characteristics of Evaporating Spray for Direct Injection Methanol Engine: Comparison between Methanol and Diesel Spray

et al. 2022

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In the context of global efforts to pursue carbon neutrality, the research on the application technology of methanol fuel in internal combustion engines has ushered in a new peak. In order to provide a theoretical basis for the development of direct injection methanol engines, the spray characteristics of methanol with high-pressure direct injection were studied. Based on the visualization experimental device of constant volume vessels, the diffused background-illumination extinction imaging (DBI) and schlieren methods were applied to examine the distinctions in the evaporating spray properties between methanol and diesel under different injection pressures and ambient temperature conditions. Furthermore, aiming to maximize the potential of methanol fuel in compression ignition engines, under the premise that the alternative fuel can obtain the same total fuel energy as diesel, two different injection strategies of methanol were proposed and evaluated through the coordination of the nozzle hole diameter, injection pressure and injection duration. It reveals that it is easier for methanol spray to evaporate because of the lower boiling point, which results in a shorter spray tip penetration and wider spray angle compared with those of diesel, especially under the middle-level ambient temperature (600 K) condition. These deviations are also observed under different injection pressure conditions. However, affected by the lower energy density, the strategies of injecting the same fuel energy of methanol with that of diesel prolong the methanol spray tip penetration, enlarge its spray area and sacrifice the methanol evaporation performance. It is necessary for the geometrical design of the combustion chamber to coordinate with the hole diameter and injection pressure selection to deal with the huge distinctions in the spray characteristics between methanol and diesel fuel.

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Section: Property Diesel Methanolmentioning

confidence: 99%

Characteristics of Evaporating Spray for Direct Injection Methanol Engine: Comparison between Methanol and Diesel Spray

et al. 2022

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“…This could be a result of the decrease in air density caused by the increase in ambient temperature, thereby reducing the air resistance to droplets. 24,41 The variation in spray angles is complicated because of the simultaneous influence of the ambient density, evaporation, air entrainment, and other factors. The increase in ambient temperature decreases the ambient density, which decreases the resistance encountered when the spray leaves the nozzle.…”

Section: Effect Of Ambient Temperaturementioning

confidence: 99%

“…The spray velocities at different ambient temperatures were 21.2 m/s (25°C), 21.5 m/s (55°C), and 22.1 m/s (85°C). This could be a result of the decrease in air density caused by the increase in ambient temperature, thereby reducing the air resistance to droplets 24,41 . The variation in spray angles is complicated because of the simultaneous influence of the ambient density, evaporation, air entrainment, and other factors.…”

Section: Variation In Macroscopic Spray Morphologymentioning

confidence: 99%

“…Their findings suggested that the maximum liquid‐phase penetration of methanol spray was insensitive to the ambient density and injection pressure. Ghosh et al 24 obtained the methanol spray vapor‐ and liquid‐phase penetration at engine‐related conditions and analyzed the varied influence of ambient temperature, ambient density, and injection pressure on methanol vapor and liquid penetration. Badawy et al 25 investigated the microscopic characteristics and macroscopic morphology of the spray for different fuels under various superheat degrees by altering the fuel temperature and ambient pressure and determined the relationship between the spray characteristics and the superheat degrees.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of the macroscopic characteristics of methanol low‐pressure injection spray

Chen²,

Su³

et al. 2022

Intl J of Energy Research

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This study aims to examine the effects of ambient pressure, fuel temperature, and ambient temperature on the macroscopic characteristics of a methanol low-pressure spray. Backlight imaging and high-speed photography are used to record spray morphology. The experimental conditions include the normal, transitional, and strong flash-boiling states. The flash-boiling state significantly increases the spray penetration and angle. The plumes of the strong flashboiling spray shrink along the injector axis into a long, narrow liquid beam, and the spray morphology is similar to that of a shuttle. The flash-boiling spray yields different performance at various ambient temperatures despite constant fuel superheat, which indicates that the flash-boiling state is affected by both the fuel superheat and ambient temperature. Moreover, the influence mechanism is examined. A high ambient temperature increases the likelihood and severity of bubble burst. By contrast, a low ambient temperature hinders bubble expansion and bursting, reducing the flash-boiling intensity. Furthermore, a dimensionless analysis of the non-flash-boiling spray velocity is performed, and the correlation between the non-flash-boiling spray velocity and air-fuel density ratio, Weber number, and Reynolds number is established. The deviation of the predictive value from the correlation and measured value is within ±5%. The results indicate that the Reynolds number has a less significant effect than the air-fuel density ratio and Weber number.

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Effect of three-hole nozzle orientations on sprays and combustion in methanol-diesel dual direct injection engines

Zhao,

Liu,

Kook

2024

Applied Thermal Engineering

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Measurement of Liquid and Vapor Penetration of Evaporating Methanol Sprays

Cited by 6 publications

References 0 publications

Characteristics of Evaporating Spray for Direct Injection Methanol Engine: Comparison between Methanol and Diesel Spray

Characteristics of Evaporating Spray for Direct Injection Methanol Engine: Comparison between Methanol and Diesel Spray

Experimental study of the macroscopic characteristics of methanol low‐pressure injection spray

Effect of three-hole nozzle orientations on sprays and combustion in methanol-diesel dual direct injection engines

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