Abstract
The span-wise obstacle on the suction surface of a hydrofoil has been verified to be an effective passive control method for cloud cavitation. The position of obstacle significantly influences the performance of cavitation control. In this research, we investigated the effect of obstacle position on attached cavitation control on the suction surface of a NACA0015 hydrofoil through response surface methodology. The cavitation types covered from sheet cavitation to partial and transitional cavity oscillations. We derived regression equations and built response surfaces to illustrate the quantitative relationship between individual factors (obstacle position, cavitation number, and angle of attack) and cavitation dynamic response parameters (cavity length, acoustic intensity, and energy flux). Sheet cavitation was effectively suppressed because the obstacle increased the pressure at the near-wall region. However, the obstacle would induce a shear cavitation when its position was too close to the leading edge of the hydrofoil. Under partial cavity oscillation conditions, the obstacle was consistently performed well in cloud cavitation control. The cavitation dynamic response parameters significantly decreased. Under transitional cavity oscillation conditions, the obstacle cannot suppress the cavitation because the transitional cavity oscillation was likely a system-inherent instability. This research is beneficial for a comprehensive understanding of cavitation control mechanism using an obstacle and for further industrial application of obstacle in hydraulic machinery to control cavitation.
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Abbreviations
- v R :
-
Velocity of re-entrant jet, m/s
- δ R :
-
Thickness of re-entrant jet, m/s
- Re:
-
Reynolds number
- v ∞ :
-
Flow velocity in the working section, m/s
- μ :
-
Dynamic viscosity of water, Pa · s
- P ∞ :
-
Pressure at the inlet of the working chamber, Pa
- P s :
-
Saturation pressure of water for the given temperature, Pa
- \(c_{O_2}\) :
-
The amount of oxygen dissolved in water, mg/l
- c :
-
Chord length of hydrofoil, mm
- S :
-
Span length of hydrofoil, mm
- ±α :
-
Highest or lowest level of factor (see Tables 1 and 2)
- k :
-
Number of factors (see Tables 1 and 2)
- σ :
-
Cavitation number
- α :
-
Angle of attack, °
- l bar :
-
Obstacle position, mm
- x 1 :
-
Coded value of cavitation number
- x 2 :
-
Coded value of angle of attack
- x 3 :
-
Coded value of obstacle position
- l c :
-
Cavity length, mm
- I :
-
Acoustic intensity, dB
- E :
-
Energy flux, J/m2
- PRESS:
-
Predicted residual sum of squares
- ANOVA:
-
Analysis of variance
- Δp i :
-
Amplitude of each time pressure fluctuation, Pa
- Δt i :
-
Duration of each time pressure fluctuation, s
- P m :
-
Peaks of surface pressure curve, m = 1, 2, 3,...
- T n :
-
Troughs of surface pressure curve, n = 1, 2, 3,...
- ρ :
-
Density of water, kg/m3
- c s :
-
Sound velocity in the water, m/s
- y 1 :
-
Response value of cavity length, mm
- y 2 :
-
Response value of acoustic intensity, dB
- y 3 :
-
Response value of energy flux, J/m2
- LE:
-
Leading edge of hydrofoil
- TE:
-
Trailing edge of hydrofoil
- C p :
-
Pressure coefficient
- f :
-
Frequency of surface pressure fluctuation, Hz
- RSM:
-
Response surface methodology
- DoE:
-
Design of experiment
- Exp1:
-
Experiment one
- Exp2:
-
Experiment two
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Acknowledgments
This research is supported by the KSB Foundation Project No. 1326 and Fundamental Research Funds for the Central Universities (2017QN81001). The authors greatly appreciate the efforts of Dr. Ning Qiu for the experiments and the support of the School of Aeronautics and Astronautics, Zhejiang University.
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Recommended by Associate Editor Sangyoup Lee
Bangxiang Che is currently a Ph.D. candidate in the Institute of Process Equipment, College of Energy Engineering, Zhejiang University (China). His research interests include mechanism and passive control of attached cavitation on hydrofoil.
Linlin Cao is currently a lecturer in the Institute of Advanced Technology, Zhejiang University (China). She received her Ph.D. in mechanical engineering from Kyushu University (Japan) in 2014. Her research interests include cavitation, vibration and noise in hydraulic machinery.
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Che, B., Cao, L., Chu, N. et al. Effect of obstacle position on attached cavitation control through response surface methodology. J Mech Sci Technol 33, 4265–4279 (2019). https://doi.org/10.1007/s12206-019-0823-y
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DOI: https://doi.org/10.1007/s12206-019-0823-y