Cavitation on NACA0015 hydrofoils with different wall roughness: high-speed visualization of the surface texture effects

Churkin, Sergey; Pervunin, Konstantin S.; Kravtsova, A. Yu.; Маркович, Д. М.; Hanjalić, K.

doi:10.1007/s12650-016-0355-9

Cited by 26 publications

(13 citation statements)

References 8 publications

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“…Churkin et al 83 also conducted a study to determine how wall roughness impacts the cavitation structure. Under specific conditions, it has been demonstrated that varying the surface roughness type and characteristics can control the formation of cavities.…”

Section: A Surface Condition and Roughnessmentioning

confidence: 99%

Cavitation control using passive flow control techniques

et al. 2021

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Passive flow control techniques, and particularly vortex generators have been used successfully in a broad range of aero-and hydrodynamics applications to alter the characteristics of boundary layer separation. This study aims to review how such techniques can mitigate the extent and impact of cavitation in incompressible flows. This review focuses first on vortex generators to characterize key physical principles. It then considers the complete range of passive flow control technologies, including surface conditioning and roughness, geometry modification, grooves, discharge, injection, obstacles, vortex generators, and bubble generators. The passive flow control techniques reviewed typically delay and suppress boundary layer separation by decreasing the pressure gradient at the separation point. The literature also identifies streamwise vortices that result in the transfer of momentum from the free stream to near-wall low energy flow regions. The area of interest concerns hydraulic machinery, whose performance and life span are particularly susceptible to cavitation. The impact on performance includes a reduction in efficiency and fluctuations in discharge pressure and flow, while cavitation can greatly increase wear of bearings, wearing rings, seals, and impeller surfaces due to excessive vibration and surface erosion. In that context, few studies have also shown the positive effects that passive controls can have on the hydraulic performance of centrifugal pumps, such as total head and efficiency. It is conceivable that a new generation of design in hydraulic systems may be possible if simple design features can be conceived to maximize power transfer and minimize losses and cavitation. There are still, however, significant research gaps in understanding a range of impact factors such as manufacturing processes, lifetime, and durability, and essentially how a static design can be optimized to deliver improved performance over a realistic range of operating conditions.

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Section: A Surface Condition and Roughnessmentioning

confidence: 99%

Cavitation control using passive flow control techniques

et al. 2021

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“…Various passive methods of cavitation control based on these principles were discussed in detail in the review by Zaresharif et al [74] , including those employing the concept of variation of the contact angle. Numerous papers have been published so far, where the effect of wall irregularities on flow structure was investigated in detail for both a cylinder (e.g., [71] , [63] , [55] , [8] , [77] , [45] ) and other objects of different shapes (e.g., [53] , [39] , [7] , [33] , [11] , [34] ). In particular, Arndt and Ippen [4] , Coutier-Delgosha et al [14] , Li et al [44] , Danlos et al [15] and Churkin et al [11] examined the roughness effect on cavitation, which is directly related to the surface wettability, confirming that the interaction of large- and small-scale irregularities with vapor cavities occurs in different ways.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous papers have been published so far, where the effect of wall irregularities on flow structure was investigated in detail for both a cylinder (e.g., [71] , [63] , [55] , [8] , [77] , [45] ) and other objects of different shapes (e.g., [53] , [39] , [7] , [33] , [11] , [34] ). In particular, Arndt and Ippen [4] , Coutier-Delgosha et al [14] , Li et al [44] , Danlos et al [15] and Churkin et al [11] examined the roughness effect on cavitation, which is directly related to the surface wettability, confirming that the interaction of large- and small-scale irregularities with vapor cavities occurs in different ways. van Rijsbergen [67] , in turn, provided a detailed review on the physical mechanisms of cavitation inception and how roughness affects them.…”

Section: Introductionmentioning

confidence: 99%

“…Leger and Ceccio [43] experimentally demonstrated that the physical properties of the wall material significantly influence the shape of an attached cavity and the location of boundary layer separation in both single-phase and cavitating flows around a hydrophilic brass and hydrophobic PTFE sphere, as well as a cylinder. However, some papers reporting on modification of the flow structure by hydrophobic and rough surfaces contain conflicting results [13] , [11] , [38] . Thus, further research in this direction is of great importance.…”

Section: Introductionmentioning

confidence: 99%

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Cavitation suppression and transformation of turbulence structure in the cross flow around a circular cylinder: Surface morphology and wettability effects

Yu. Nichik,

Ilyushin,

Kadivar

et al. 2024

Ultrasonics Sonochemistry

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“…Their results revealed that the cavitation fluctuations can be suppressed in the cloud cavitating regimes using their passive control method. Churkin et al [22] studied the effect of wall roughness on the cavitation dynamics. They showed that the surface roughness can manipulate the cavitation dynamics and can control the development of the cavitation.…”

Section: Introduction mentioning

confidence: 99%

An experimental investigation of transient cavitation control on a hydrofoil using hemispherical vortex generators

et al. 2021

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Unsteady cavitation causes noise, damage, and performance decline in the marine engineering and fluid machinery systems. Therefore, finding a method to control the cavitation and its destructive effects is important for the industrial applications. In this work, we proposed a passive method to control the unsteady behavior of transient cavitation at the medium Reynolds number. For this aim, we performed an experimental study using a high-speed camera to analyze the effects of hemispherical vortex generators (VGs) on the cavitation dynamics around a hydrofoil surface. In addition, the pressure pulsations induced by the collapse of the cavity structures in the wake region of the hydrofoil were captured with a pressure transducer mounted on the wall downstream of the hydrofoil. The results showed that the instability behaviors of the cavity structures on the hydrofoil were mitigated using the proposed cavitation passive control method. In addition, the pressure pulsations in the wake region of the hydrofoil were reduced significantly. It can be concluded that the suppression of cavitation instabilities can improve the operating life and reliability of the marine and hydraulic systems.

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Cavitation on NACA0015 hydrofoils with different wall roughness: high-speed visualization of the surface texture effects

Cited by 26 publications

References 8 publications

Cavitation control using passive flow control techniques

Cavitation control using passive flow control techniques

Cavitation suppression and transformation of turbulence structure in the cross flow around a circular cylinder: Surface morphology and wettability effects

An experimental investigation of transient cavitation control on a hydrofoil using hemispherical vortex generators

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