Dynamics of cavity structures and wall-pressure fluctuations associated with shedding mechanism in unsteady sheet/cloud cavitating flows
نویسندگان
چکیده
The physics and mechanism of sheet/cloud cavitation in a convergent–divergent channel are investigated using synchronized dynamic surface pressure measurement high-speed imaging water tunnel to probe the cavity shedding mechanism. Experiments conducted at fixed Reynolds number Re = 7.8 × 10 5 for different values σ between 1.20 0.65, ranging from intermittent inception cavitation, sheet quasi-periodic cloud cavitation. Two distinct regimes, i.e. re-entrant jet shockwave mechanism, observed, accompanied by complex flow phenomenon dynamics, examined detail. An increase fluctuation intensity numbers 3 4 transducer locations captured during transition spectral content analysis shows that, several frequency peaks identified with dominant caused large-scale process secondary related jet/shockwave dynamics. Statistical based on defined grey level profiles reveals double-peak behaviours probability density functions negative skewness found be owing interactions cavities region 0.25 ~ 0.65 mean length ( L c ). In addition, multi-scale proper orthogonal decomposition an emphasis structures under both their responsible dynamics statistics process.
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ژورنال
عنوان ژورنال: Flow
سال: 2023
ISSN: ['2633-4259']
DOI: https://doi.org/10.1017/flo.2023.2