SP2-2 Velocity distribution inside a diesel spray under high ambient density condition(SP: Spray and Spray Combustion,General Session Papers)

Zama, Yoshio; Ochiai, Wataru; Furuhata, Tomohiko; Arai, Masataka

doi:10.1299/jmsesdm.2012.8.653

Cited by 3 publications

(2 citation statements)

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“…However, the parameters of the formula proposed by varied researchers were slightly different. For instance, the formula proposed by Zama et al [38] used a characteristics index of radial dispersion of spray velocity. In contrast, the formula from Payri et al [37] predicted the spray velocity field with a characteristics index of the radial/axial location ratio.…”

Section: Discussionmentioning

confidence: 99%

Transient Nozzle-Exit Velocity Profile in Diesel Spray and Its Influencing Parameters

Gao¹,

Huang

Pratama³

et al. 2022

IJAMM

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Article Transient Nozzle-Exit Velocity Profile in Diesel Spray and Its Influencing Parameters Ya Gao 1, Weidi Huang 2,*, Raditya Hendra Pratama 2, and Jin Wang 1 1 Advanced Photon Source, Argonne National Laboratory, 9700 S Cass Ave, Lemont, IL 60439, United States 2 Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8564, Japan * Correspondence: wd.huang@aist.go.jp Received: 24 September 2022 Accepted: 10 November 2022 Published: 25 December 2022 Abstract: The primary breakup in the diesel spray relies closely on the initial dynamics at the nozzle exit. However, solid experimental results are still missing due to the great difficulties in measuring the near-nozzle spray dynamics. This study proposed an investigation focusing on the transient nozzle-exit spray dynamics by taking advantage of the X-ray phase contrast imaging technique. The in-nozzle needle motion, spray morphology, and dynamics at a commercial diesel nozzle exit were obtained. Experimental results were then examined, linking with the needle motion to understand the transient spray dynamics. The effect of the initial conditions (i.e., the injection pressure and ambient density) on the resulting trends were also considered. It is found that the nozzle-exit spray morphology and velocity profile highly relate to the in-nozzle needle lift. Once the needle sufficiently opens, the spray reaches steady status, and the nozzle-exit velocity becomes almost constant. The spray width slightly increases with the increasing ambient gas density or the decreasing injection pressure. Injection pressure significantly affects the spray velocity amplitude, whereas the ambient gas density alters the spray-velocity profiles mainly in the periphery of the spray. Finally, an analytic analysis was conducted to further examine the transient spray axial velocity with the changing radial locations. It is found the nozzle-exit spray velocity can be predicted in the Gaussian-type formula. This feature likely relates to in-nozzle flow characteristics.

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Section: Discussionmentioning

confidence: 99%

Transient Nozzle-Exit Velocity Profile in Diesel Spray and Its Influencing Parameters

Gao¹,

Huang

Pratama³

et al. 2022

IJAMM

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“…It shows the results of FFT analysis on r = 0 (center) r = σ and r = 2σ location. Here, radial distance σ is a standard deviation location in radial velocity distribution [23,24]. Red values represent the wavelengths corresponding with the frequency peaks and average spray velocity.…”

Section: Contour Of Ss ≅ Contour Of Lsmentioning

confidence: 99%

Interpretative Review of Diesel Spray Penetration Normalized by Length and Time of Breakup (Similarity Law of Diesel Spray and Its Application)

Arai

2022

Energies

Self Cite

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Tip penetration of diesel spray is one of the most useful parameters to evaluate diesel combustion dynamics. It has strong relationships with ignition delay, premix/diffusion combustion and engine performance, including exhaust emissions. To discuss general combustion physics in various size sprays, non-dimensional expression of spray tip penetration is reviewed. Length and time of injected fuel jet breakup can be considered as characteristic length and timescale of diesel spray. Then, normalized penetration by length and time of breakup was proposed for the scaling of various diesel sprays. Using the proposed scaling method and similarity law, tip penetrations of various size sprays are collapsed into one simple expression. It becomes a base of similarity law of diesel spray. For example, local or average A/F is uniquely expressed by the normalized length and time of breakup. Penetration of a wall impingement spray is also expressed uniquely by this normalization method and physical parameters affecting the wall impingement spray are explained. Injection rate shaping effect at an initial stage of injection is clearly demonstrated by using this scaling. Further, mixing degrees of diesel spray at an ignition timing and in a combustion phase can be reasonably explained by the equivalence ratio change with non-dimensional elapsed time after injection start.

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An Analysis on Heat Loss of a Heavy-Duty Diesel Engine by Wall-Impinged Spray Flame Observation

Osada¹,

Uchida²,

Zama

2015

SAE Technical Paper Series

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SP2-2 Velocity distribution inside a diesel spray under high ambient density condition(SP: Spray and Spray Combustion,General Session Papers)

Cited by 3 publications

References 0 publications

Transient Nozzle-Exit Velocity Profile in Diesel Spray and Its Influencing Parameters

Transient Nozzle-Exit Velocity Profile in Diesel Spray and Its Influencing Parameters

Interpretative Review of Diesel Spray Penetration Normalized by Length and Time of Breakup (Similarity Law of Diesel Spray and Its Application)

An Analysis on Heat Loss of a Heavy-Duty Diesel Engine by Wall-Impinged Spray Flame Observation

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