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Experimental investigation of three distinct mechanisms for the transition from sheet to cloud cavitation
ID
Zhang, Guangjian
(
Avtor
),
ID
Zhang, Desheng
(
Avtor
),
ID
Ge, Mingming
(
Avtor
),
ID
Petkovšek, Martin
(
Avtor
),
ID
Coutier-Delgosha, Olivier
(
Avtor
)
PDF - Predstavitvena datoteka. Vsebina dokumenta nedostopna do 15.11.2024.
MD5: 1C1865A944C160A9987C4E85866626D1
URL - Izvorni URL, za dostop obiščite
https://www.sciencedirect.com/science/article/pii/S0017931022008420
Galerija slik
Izvleček
The conventional high-speed images of cavitation with a set of X-ray phase contrast images reveal the presence of three different types of mechanisms responsible for large cloud shedding: re-entrant jet mechanism, condensation shock wave mechanism, and collapse-induced pressure wave mechanism. At higher cavitation numbers, the sheet cavity is relatively short and the cavity detachment is a consequence of a re-entrant jet pinching off the cavity from its leading edge. At lower cavitation numbers, the re-entrant jet plays a smaller role in the cavitation instabilities and the primary reason for periodic cloud shedding is the condensation shock mechanism where a void fraction discontinuity propagates upstream until collapsing the entire cavity. If the amount of shed vapour cloud reaches a certain extent, the collapse will emit a pressure wave strong enough to disturb the growing cavity, and subsequently make it detached from the wall. This is the third mechanism observed in the experiments. We point out the inappropriate classification of combining condensation shock and collapse-induced pressure wave mechanisms in the literature, since we identify pronounced differences between them: (i) the pressure increase across the condensation front is very weak (a few kPa) while the amplitude of collapse-induced pressure wave can be hundreds of kPa, (ii) the travelling velocity of the collapse-induced pressure wave within the cavity is much faster than the condensation shock, and (iii) the collapse-induced pressure wave does not result in an obvious discontinuity in void fraction when it propagates through the cavity, in contrary to the condensation shock.
Jezik:
Angleški jezik
Ključne besede:
cavitation
,
cavitation instability mechanism
,
condensation shock
,
re-entrant jet
,
pressure wave
Vrsta gradiva:
Članek v reviji
Tipologija:
1.01 - Izvirni znanstveni članek
Organizacija:
FS - Fakulteta za strojništvo
Status publikacije:
Objavljeno
Različica publikacije:
Objavljena publikacija
Datum objave:
15.11.2022
Leto izida:
2022
Št. strani:
16 str.
Številčenje:
Vol. 197, art. 123372
PID:
20.500.12556/RUL-139721
UDK:
532
ISSN pri članku:
0017-9310
DOI:
10.1016/j.ijheatmasstransfer.2022.123372
COBISS.SI-ID:
120414211
Datum objave v RUL:
06.09.2022
Število ogledov:
477
Število prenosov:
37
Metapodatki:
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Objavi na:
Gradivo je del revije
Naslov:
International journal of heat and mass transfer
Skrajšan naslov:
Int. j. heat mass transfer
Založnik:
Elsevier
ISSN:
0017-9310
COBISS.SI-ID:
3064335
Sekundarni jezik
Jezik:
Slovenski jezik
Ključne besede:
kavitacija
,
kavitacijska nestabilnost
,
kondenzacijski šok
,
povratni tok
,
tlačni val
Projekti
Financer:
Drugi - Drug financer ali več financerjev
Program financ.:
Jiangsu University
Številka projekta:
21JDG043
Financer:
Drugi - Drug financer ali več financerjev
Program financ.:
National Natural Science Foundation of China
Številka projekta:
51776087
Financer:
Drugi - Drug financer ali več financerjev
Program financ.:
Joint Key Project of National Natural Sci- ence Foundation of China
Številka projekta:
U2106225
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