X-Ray Phase Contrast Imaging of Cavitation and Discharged Liquid Jet in Nozzles With Various Sizes

Prasetya, Rubby; Sou, Akira; Moon, Seoksu; Pratama, Raditya Hendra; Wada, Yoshitaka; Yokohata, Hideaki

doi:10.1615/atomizspr.2019029661

Cited by 9 publications

(3 citation statements)

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“…12 clearly indicates the trend. (Prasetya et al, 2019) has shown that nozzles with W < 2 mm are subject to stronger effect of surface tension on the interface between the liquid jet and the surrounding gas, compared to larger nozzles. As the nozzle used in the current study has a W of 1 mm, the effect of surface tension might play a large role in determining the resulting θ.…”

Section: Effect Of Ambient Pressure On the Resulting Liquid Jet Anglementioning

confidence: 99%

“…In this study, flow visualization of internal cavitating flow and the discharged liquid jet from a transparent, enlarged two-dimensional (2D) nozzle (Sou et al, 2006) is carried out under various ambient pressures Pa (Pa = 0.1, 0.2, 0.3, 0.4, and 0.5 MPa), in order to clarify the effects of Pa on cavitation development and the discharged liquid jet characteristics. Then, the applicability of various non-dimensional cavitation numbers (Bergwerk, 1959;Nurick, 1976;Payri et al, 2004;Prasetya, Sou, Wada andYokohata, Journal of Fluid Science andTechnology, Vol.14, No.1 (2019) Soteriou et al, 1995;Sou et al, 2008a) to quantitatively predict cavitation at various ambient pressures is examined. Finally, a correlation on the liquid jet angle θ for various Pa and σc is proposed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of ambient pressure on cavitation in the nozzle and the discharged liquid jet

Prasetya

Sou

Wada

et al. 2019

JFST

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Effects of ambient pressure on cavitation in the nozzle and the discharged liquid jet Abstract Cavitation in the nozzle plays an important role in the atomization of the discharged liquid jet. Because of this, understanding in-nozzle cavitation is very important for the control of spray characteristics. However, in-nozzle cavitation is not fully understood at present, in part because it is affected by various factors, such as fluid properties, injector geometries, and ambient pressure. Although it is obvious that ambient pressure hinders cavitation development in the nozzle, the extent of the effect has not been quantitatively predicted yet. In the present study, visualization of cavitation in an enlarged two-dimensional (2D) transparent nozzle and the discharged liquid jet is carried out under various ambient pressure Pa (Pa = 0.1, 0.2, 0.3, 0.4, and 0.5 MPa). From the flow visualization result, an image analysis is carried out to obtain the experimental data on the effects of ambient pressure on cavitation length Lc, cavitation width Wc, and liquid jet angle θ. Finally, a set of correlations on Lc, modified cavitation number σc, jet angle θ, and the Weber number We at various ambient pressures are proposed, based on the image analysis results.

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Section: Effect Of Ambient Pressure On the Resulting Liquid Jet Anglementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of ambient pressure on cavitation in the nozzle and the discharged liquid jet

Prasetya

Sou

Wada

et al. 2019

JFST

Self Cite

View full text Add to dashboard Cite

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“…Subsequently, X-ray imaging and neutron imaging were widely used in the study of fuel flow in the nozzle. [7][8][9][10] Ghiji et al 11 used laser backlight imaging technology to analyze the spray structure. Due to the influence of aerodynamics, the mushroom head shape appeared at the front end of the jet, and the shock wave phenomenon was captured by Schlieren method in the jet atomization area.…”

Section: Introductionmentioning

confidence: 99%

Study on cyclic variation rate of fuel flow in the nozzle during fuel injection

Hua

Zhang

Jiang

et al. 2021

International Journal of Spray and Combustion Dynamics

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The fuel flow pattern in the fuel injection nozzle of diesel engine is a complex and changeable phenomenon, which is easily affected by various factors, bringing the differences of flow patterns between multiple injection cycles. To solve the above problem, a visual experimental platform of fuel injection nozzle was built, in which the 100 injection cycles of diesel engine on the same working condition were photographed via shadowgraphy to study the difference in fuel flow pattern in the nozzle by ensemble average processing method. The cyclic variation rate K of fuel flow pattern is defined. Results demonstrate that the fuel flow pattern tends to be the same in multiple fuel injection cycles, but there is a strong randomness at the starting of injection and after ending of injection; the K can be reduced by decreasing the injection pressure and the inclination angle of orifice, so that the fuel flow pattern in the nozzle tends to be consistent.

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