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Research on the mechanics of underwater supersonic gas jets
Shi HH(施红辉); Wang BY(王伯懿); Dai ZQ; Shi HH
Source PublicationScience China-Physics Mechanics & Astronomy
AbstractAn experimental research was carried out to study the fluid mechanics of underwater supersonic gas jets. High pressure air was injected into a water tank through converging-diverging nozzles (Laval nozzles). The jets were operated at different conditions of over-, full-and under-expansions. The jet sequences were visualized using a CCD camera. It was found that the injection of supersonic air jets into water is always accompanied by strong flow oscillation, which is related to the phenomenon of shock waves feedback in the gas phase. The shock wave feedback is different from the acoustic feedback when a supersonic gas jet discharges into open air, which causes screech tone. It is a process that the shock waves enclosed in the gas pocket induce a periodic pressure with large amplitude variation in the gas jet. Consequently, the periodic pressure causes the jet oscillation including the large amplitude expansion. Detailed pressure measurements were also conducted to verify the shock wave feedback phenomenon. Three kinds of measuring methods were used, i.e., pressure probe submerged in water, pressure measurements from the side and front walls of the nozzle devices respectively. The results measured by these methods are in a good agreement. They show that every oscillation of the jets causes a sudden increase of pressure and the average frequency of the shock wave feedback is about 5-10 Hz.
Indexed BySCI
WOS IDWOS:000276661700028
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China [10672144] ; Natural Science Foundation of Zhejiang Province of China [Y107073] ; Chinese Academy of Sciences ; Zhejiang Province of China
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Cited Times:24[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorShi HH
Recommended Citation
GB/T 7714
Shi HH,Wang BY,Dai ZQ,et al. Research on the mechanics of underwater supersonic gas jets[J]. Science China-Physics Mechanics & Astronomy,2010,53(3):527-535.
APA 施红辉,王伯懿,Dai ZQ,&Shi HH.(2010).Research on the mechanics of underwater supersonic gas jets.Science China-Physics Mechanics & Astronomy,53(3),527-535.
MLA 施红辉,et al."Research on the mechanics of underwater supersonic gas jets".Science China-Physics Mechanics & Astronomy 53.3(2010):527-535.
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