Spray impingement wall film breakup by wave entrainment

Li, Xuesong; Pan, Hujie; Deng, Xue

doi:10.1016/j.proci.2018.07.101

Cited by 36 publications

(22 citation statements)

References 19 publications

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“…Another possible reason for this observation is given in the next session that follows. Therefore, by increasing the wall temperature before Leidenfrost phenomenon takes place, the fuel film would have an improved mass transport efficiency, enhancing the dynamic motion of the fuel film, and consequently enhance associated fuel breakup, as previously presented in Li et al 24…”

Section: Resultsmentioning

confidence: 79%

“…To better exhibit the wavy pattern of the fuel film, we chose a narrow region in the center of the fuel film, as indicated in Figure 2, and plot the averaged film thickness as a function of propagation distance. The surface wave propagation phenomenon has been introduced previously, 24 and the wave pattern can also be clearly identified in Figure 2, where crescent shape, very thick film ridges were formed (as represented by the dark regions in Figure 2) and such structures move forward in the direction of the spray droplets after tilted impingement. As seen, all the waves (a total of three from this measurement) shown in the two-dimensional measurements could be identified in the one-dimensional curve, and the wave height was notably higher than typical fuel film regions.…”

Section: Methodsmentioning

confidence: 74%

“…In our previous investigations, 24 we have demonstrated the secondary breakup of the impingement wall film with significant surface wave motions. Figure 2 depicts an example of the LIF measurements of the fuel footprint on the sapphire plate.…”

Section: Methodsmentioning

confidence: 76%

“…In this work, we defined ASOI based on the physical start of injection when fuel first exits the nozzle. The thickness of the fuel film was pre-calibrated in a fashion similar to the method used in Li et al 24 In brief, a precise gasket was used to form a fuel wedge between two flat sapphire plates. The fuel in the gap was doped with the same amount of ethanol and rhodamine and excited by the same high-speed laser.…”

Section: Methodsmentioning

confidence: 99%

“…In contrast, we used Rhodamine LIF to quantify the fuel film thickness and characterized the wave propagations and breakups on impingement fuel films. 24 Then, the investigations were further developed with particle imaging velocimetry (PIV) measurement and phase Doppler measurements (PDI), providing a modified droplet impingement criterion for spray impingement studies. 25 It is worth noting that all optical diagnostic methods introduced have their limitations, and proper diagnostics method should be chosen based on specific research needs.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of spray impingement wall film under cold start conditions

Xiao

Parrish

et al. 2019

International Journal of Engine Research

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Fuel film that adhered on engine walls from spray impingement is considered a primary source of harmful combustion emissions. However, the physics of the wall film formation, propagation, and breakup is not fully understood yet because of its multiphase nature. Existing literature has revealed that the mass transportation within the fuel film takes a wave propagation form. This article aims to identify the dynamics of the wall film during spray impingement via high-speed laser diagnostics. In this work, a single-hole injector was used and the spray impinged onto a stage made of sapphire glass for diagnostics purposes. Iso-octane was used as the fuel and 10% ethanol was blended to dope rhodamine 6G as the fluorescent species for laser excitation. Simultaneous optical measurements, such as laser-induced fluorescence and Mie scattering, are performed to obtain the characteristics of the wall film quantitatively. Various aspects of the wall film, including the frequency of the wave, wave speed, and wave height, are inspected. The impact of fuel temperature and wall temperature under typical cold-start conditions are also studied to investigate the temperature dependence of the wall film dynamics. The research is also intended to provide quantitative experimental data for numerical models for impingement prediction and thus help the process of emission reduction and combustion optimization of internal combustion engines.

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Section: Resultsmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 74%

Section: Methodsmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamics of spray impingement wall film under cold start conditions

Xiao

Parrish

et al. 2019

International Journal of Engine Research

Self Cite

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Biodiesel from Biomass Waste Feedstock Prosopis Juliflora as a Fuel Substitute for Diesel and Enhancement of Its Usability in Diesel Engines Using Decanol

et al. 2023

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Biomass‐based biofuel production is a promising solution to the decline of fossil fuels. Prosopis juliflora seed‐derived vegetable oil, known as Prosopis juliflora methyl ester (JFME), offers a potential feedstock for biodiesel. To enhance its properties, the addition of Decanol is investigated, a higher‐order alcohol similar to Diesel. Experiments are conducted on a 5.2 kW compression ignition (CI) engine using JFME blended with different decanol concentrations (5%, 10%, 15%, and 20%). Fourier‐transform infrared spectroscopy and gas chromatography‐mass spectrometry analysis confirm its compliance with fuel standards. The findings reveal that the 20% decanol blend (D20) achieves a brake thermal efficiency of 29.9% at full load, with reduced NO, smoke, and hydrocarbon (HC) emissions compared to diesel. D20 shows NO emissions of 1265 ppm, smoke opacity of 53%, and HC emissions of 69 ppm, while diesel records 1320 ppm, 69%, and 75 ppm, respectively. The CO emissions for D20 are 0.359 vol%, slightly higher due to decanol's higher latent heat of evaporation. Moreover, D20 exhibits improved combustion with a higher mass fraction burnt and faster heat release rates. These results indicate the potential of using JFME blended with 20% decanol as an alternative fuel for CI engines, offering higher performance and reduced emissions.

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Spray Characteristics with High-Speed Tomographic Particle Image Velocimetry Under Non-Flash and Flash Boiling Conditions

Liu

Pan

2019

J. Shanghai Jiaotong Univ. (Sci.)

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Spray impingement wall film breakup by wave entrainment

Cited by 36 publications

References 19 publications

Dynamics of spray impingement wall film under cold start conditions

Dynamics of spray impingement wall film under cold start conditions

Biodiesel from Biomass Waste Feedstock Prosopis Juliflora as a Fuel Substitute for Diesel and Enhancement of Its Usability in Diesel Engines Using Decanol

Spray Characteristics with High-Speed Tomographic Particle Image Velocimetry Under Non-Flash and Flash Boiling Conditions

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