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

by Boshen Liu * and Fei Ma
School of Mechanical Engineering, University of Science & Technology Beijing, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(10), 2563; https://doi.org/10.3390/en13102563
Received: 25 April 2020 / Revised: 11 May 2020 / Accepted: 13 May 2020 / Published: 18 May 2020
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 ratios l d / d t in the cases where the oblique angles are α = 0°, 5°, 15° and 30°. In the low l d / d t range, 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 frequency f 0 is away from the design frequency of the organ-pipe nozzle, resulting in the depressed aggressive ability in the low l d / d t range. With increasing l 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. View Full-Text
Keywords: cavitating waterjet; erosion; self-resonating oscillations cavitating waterjet; erosion; self-resonating oscillations
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Liu, B.; Ma, F. Erosion Characteristics and the Corresponding Self-Resonating Oscillations of Cavitating Jet on Oblique Surfaces. Energies 2020, 13, 2563.

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