On the shedding of the ventilated supercavity with velocity disturbance

Zou, Wang; Yu, Kaiping; Arndt, Roger E. A.; Guang, Zhang; Li, Zhengwang

doi:10.1016/j.oceaneng.2012.09.013

Cited by 31 publications

(5 citation statements)

References 12 publications

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“…A similar explanation can also be given for a larger Qc obtained at a higher Fr, but nearly same St. Previous studies (For instance, [21]) have shown that, the re-entrant jet velocity is approximately equal to the incoming liquid velocity.…”

Section: Steady State Experimentssupporting

confidence: 82%

Gas entrainment behaviors in the formation and collapse of a ventilated supercavity

Karn

Arndt

Hong

2016

Experimental Thermal and Fluid Science

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The present work reports some interesting gas entrainment behaviors in the formation and collapse of a ventilated supercavity under steady and unsteady flow conditions. Our experiments show that the gas entrainment required to establish a supercavity are much greater than the minimum gas entrainment required to sustain it, and these gas entrainment values depend on Froude (Fr) number, cavitator size and the flow unsteadiness. Specifically, the measurements of the formation gas entrainment coefficients under different Fr numbers indicate that it does not monotonically increase with Fr but displays increasing and decreasing trends in different regimes of Fr. On the other hand, the collapse air entrainment coefficient initially decreases with Fr and then approaches to a constant. Similar trends of formation and collapse gas entrainment coefficient are observed for different cavitator sizes. Moreover, the introduction of unsteady gusts causes a slight monotonic increase in the formation and collapse gas entrainment

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Section: Steady State Experimentssupporting

confidence: 82%

Gas entrainment behaviors in the formation and collapse of a ventilated supercavity

Karn

Arndt

Hong

2016

Experimental Thermal and Fluid Science

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“…(1)-(9) and (15), the self-developed cavitation number correction algorithm (Zou et al, 2013a(Zou et al, , 2013b) is used to determine supercavity shape on the updated trajectory. Time term is discretized by a second order full implicit scheme.…”

Section: Methodsmentioning

confidence: 99%

“…(7). Without loss of generality, similar to the cases in our previous study (Zou et al, 2013a), the disturbance is set in the following form:…”

Section: Validation Of the Supercavity Modelmentioning

confidence: 99%

Three-dimensional ventilated supercavity on a maneuvering trajectory

2016

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“…The research focuses on hole geometry [9][10][11] and dynamic characteristics, [12][13][14] such as inlet rounded corners, 15,16 nozzle shapes, 17 length-todiameter ratio. 18,19 Specifically, Zou et al 20 found that the shedding phenomenon of the cavitation tail was related to the internal flow of fuel, and the kinetic parameters were potential factors. Zhu et al 21 revealed a shedding mechanism, in which the main cavitation shedding mechanism was stable, and the cavitation would grow again after being cut off by the return jet.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

Cao

Wang

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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Aiming at the complicated vortex problem that affects the flow stability of diesel engine nozzles, this paper focuses on the effect of ventilation on the string cavitation patterns in the nozzle hole with a self-built scale-up test bench. Hole-to-hole string cavitation is not stable without bubbles, and the ventilation can improve the situation. Relatively speaking, the position of hole-to-hole string cavitation in the SAC volume changes significantly with the bubble content. In contrast, the needle-originated string cavitation is stable in the vortex channel. Only if there are many bubbles, the cavitation pattern changes to hole-to-hole string cavitation or string cavitation originating from the upper wall of the hole inlet. At this point, the corresponding atomization morphology changes, and the spray angle decreases significantly. It is verified that there is a one-to-one correspondence between the cavitating pattern and the spray angle near the hole.

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On the shedding of the ventilated supercavity with velocity disturbance

Cited by 31 publications

References 12 publications

Gas entrainment behaviors in the formation and collapse of a ventilated supercavity

Gas entrainment behaviors in the formation and collapse of a ventilated supercavity

Three-dimensional ventilated supercavity on a maneuvering trajectory

Investigation on the effect of ventilation on string cavitation patterns in diesel nozzles

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