Effect of obstacle position on attached cavitation control through response surface methodology

Che, Bangxiang; Cao, Linlin; Chu, Ning; Likhachev, Dmitriy S.; Wu, Dazhuan

doi:10.1007/s12206-019-0823-y

Cited by 28 publications

(3 citation statements)

References 42 publications

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“…The cavity length was increased both for the lower and higher supercavitation conditions studied numerically. Che et al 167 focused on a spanwise obstacle located on the suction side of the hydrofoil shown in Fig. 16.…”

Section: Physics Of Fluidsmentioning

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: Physics Of Fluidsmentioning

confidence: 99%

Cavitation control using passive flow control techniques

et al. 2021

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“…Lin et al [17] found that circular obstacles on the plane hydrofoil could stabilize the leading-edge cavitation and reduce the shedding cavitation. Che et al [18] focused on the obstacles on the suction side of hydrofoil, and found that the increase of wall pressure near the obstacles inhibited the development of sheet cavitation, verifying the effectiveness of obstacles in cavitation control. Podnar et al [20] studied the influence of spherical blade shape on flow characteristics, and found that modifying the design parameters of hydrofoil can reduce the occurrence and development of cavitation.…”

Section: Introductionmentioning

confidence: 97%

“…Passive control of hydrofoil cavitation refers to disturb the flow by changing the surface structure or material properties of hydrofoils, so as to inhibit the occurrence and development of cavitation [15] , [16] . There are many studies on the passive control methods, such as setting obstacles on the hydrofoil surface [17] , [18] and modifying the airfoil profiles [19] , [20] . Lin et al [17] found that circular obstacles on the plane hydrofoil could stabilize the leading-edge cavitation and reduce the shedding cavitation.…”

Section: Introductionmentioning

confidence: 99%