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The erosion and the corresponding self-resonating oscillations of the cavitating jet were experimentally investigated on the oblique surfaces. To evaluate the intensities of erosion and self-resonating oscillations of the jet, mass loss, surface morphology of the eroded specimens, upstream fluctuating pressure and unsteady cavitation noise were obtained at a series of stand-off distance ratiosl d  /  d tin the cases where the oblique angles are    α    = 0°, 5°, 15° and 30°. In the lowl d  /  d trange, with the increase of    α   , the erosion gradually transforms from two isolated circular erosion rings at    α    = 0° into irregular oval shaped rings at    α    = 5° and separated horseshoe shaped rings at    α    = 15°. The self-resonating oscillations and cavitation were weak in this range because the dominating frequencyf 0is away from the design frequency of the organ-pipe nozzle, resulting in the depressed aggressive ability in the lowl d  /  d trange. With increasingl d  /  d t, the cavitation is enhanced before the self-resonating oscillations achieving more energy. The spectral decomposition reveals the existence of an intermediate state at the optimum standoff distance, where the energy of self-resonating oscillations and the cavitation reach a balance to realize the severest erosion damage.

Erosion Characteristics and the Corresponding Self-Resonating Oscillations of Cavitating Jet on Oblique Surfaces