Impact of obstacle placement on response surface methodology-based connected cavitation control

It has been confirmed that the span-wise obstruction on a hydrofoil’s suction surface works well as a passive cloud cavitation control mechanism. The cavitation control performance is strongly influenced by the obstacle’s position. In this study, we used response surface methodology to examine how obstacle position affected attached cavitation control on a NACA0015 hydrofoil’s suction surface. The varieties of cavitation included partial and transitional cavity oscillations as well as sheet cavitation. To demonstrate the quantitative relationship between the cavitation dynamic response parameters (cavity length, acoustic intensity, and energy flux) and individual components (obstacle position, cavitation number, and angle of attack), we constructed response surfaces and generated regression equations. Because the obstruction raised the pressure in the area close to the wall, sheet cavitation was successfully prevented.However, if the obstruction was positioned too near the hydrofoil’s leading edge, it would cause a shear cavitation. The obstacle continuously performed effectively in cloud cavitation control under partial cavity oscillation settings. There was a considerable drop in the cavitation dynamic response parameters. Under Because the transitional cavity oscillation was probably a system-inherent instability, the obstruction is unable to control the cavitation under these conditions. This study contributes to a thorough comprehension of the obstacle-based cavitation control mechanism and to the future industrial use of obstacles in hydraulic gear for cavitation control.