Dependence of supercavity closure upon flow unsteadiness

Ashish Karn; Roger E.A. Arndt; Jiarong Hong

doi:10.1016/j.expthermflusci.2015.06.011

Dependence of supercavity closure upon flow unsteadiness

Ashish Karn, Roger E.A. Arndt, Jiarong Hong

Mechanical Engineering

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47 Scopus citations

Abstract

The present work reports some interesting experimental results for ventilated supercavitation in an unsteady flow. Our experiments have shown that incoming flow unsteadiness does not only affect supercavity shape but also leads to a change in supercavity closure, irrespective of the presence of a body inside the supercavity. Synchronized high-speed imaging and pressure measurements have ascertained the dependence of supercavity closure on instantaneous cavitation number under unsteady flow conditions. Further, control-volume analysis at the closure shows the intricate relation among the cavitation number, pressure difference occurring at the supercavity closure and the obtained closure mechanisms.

Original language	English (US)
Pages (from-to)	493-498
Number of pages	6
Journal	Experimental Thermal and Fluid Science
Volume	68
DOIs	https://doi.org/10.1016/j.expthermflusci.2015.06.011
State	Published - Nov 1 2015

Bibliographical note

Funding Information:
The authors gratefully acknowledge support by the Office of Naval Research (Program manager, Dr. Ronald Joslin) under Grant # N000140910141 . We also acknowledge the contribution of Mr. Ellison Kawakami for the closure images shown in Fig. 3 .

Publisher Copyright:
© 2015 Elsevier Inc.

Keywords

Supercavitation
Supercavity closure
Unsteady supercavitation
Ventilation

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title = "Dependence of supercavity closure upon flow unsteadiness",

abstract = "The present work reports some interesting experimental results for ventilated supercavitation in an unsteady flow. Our experiments have shown that incoming flow unsteadiness does not only affect supercavity shape but also leads to a change in supercavity closure, irrespective of the presence of a body inside the supercavity. Synchronized high-speed imaging and pressure measurements have ascertained the dependence of supercavity closure on instantaneous cavitation number under unsteady flow conditions. Further, control-volume analysis at the closure shows the intricate relation among the cavitation number, pressure difference occurring at the supercavity closure and the obtained closure mechanisms.",

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note = "Funding Information: The authors gratefully acknowledge support by the Office of Naval Research (Program manager, Dr. Ronald Joslin) under Grant # N000140910141 . We also acknowledge the contribution of Mr. Ellison Kawakami for the closure images shown in Fig. 3 . Publisher Copyright: {\textcopyright} 2015 Elsevier Inc.",

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AU - Arndt, Roger E.A.

AU - Hong, Jiarong

N1 - Funding Information: The authors gratefully acknowledge support by the Office of Naval Research (Program manager, Dr. Ronald Joslin) under Grant # N000140910141 . We also acknowledge the contribution of Mr. Ellison Kawakami for the closure images shown in Fig. 3 . Publisher Copyright: © 2015 Elsevier Inc.

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N2 - The present work reports some interesting experimental results for ventilated supercavitation in an unsteady flow. Our experiments have shown that incoming flow unsteadiness does not only affect supercavity shape but also leads to a change in supercavity closure, irrespective of the presence of a body inside the supercavity. Synchronized high-speed imaging and pressure measurements have ascertained the dependence of supercavity closure on instantaneous cavitation number under unsteady flow conditions. Further, control-volume analysis at the closure shows the intricate relation among the cavitation number, pressure difference occurring at the supercavity closure and the obtained closure mechanisms.

AB - The present work reports some interesting experimental results for ventilated supercavitation in an unsteady flow. Our experiments have shown that incoming flow unsteadiness does not only affect supercavity shape but also leads to a change in supercavity closure, irrespective of the presence of a body inside the supercavity. Synchronized high-speed imaging and pressure measurements have ascertained the dependence of supercavity closure on instantaneous cavitation number under unsteady flow conditions. Further, control-volume analysis at the closure shows the intricate relation among the cavitation number, pressure difference occurring at the supercavity closure and the obtained closure mechanisms.

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KW - Ventilation

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Dependence of supercavity closure upon flow unsteadiness

Abstract

Bibliographical note

Keywords

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