High-Speed Observations of the Vibratory Cavitation Accompanying Hard Erosion

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概要

• 論文の詳細を見る

• In this paper, the term "hard erosion" refers to erosion which is faster than ordinary erosion by a factor of two or more. Here, we carefully observe cavitation aspects of several types and the corresponding eroded surfaces in typically accelerating vibratory erosion tests on a typical erosion-resistant material of 304 stainless steel by means of high-speed and SEM photography, under a specified condition of uniform cavitation nuclei size distributions. Hard erosion clearly results from very high shock pressures accompanied not by microjet bubbles or bubble clusters, but by collapsing massive bubbles. The massive bubbles very rapidly develop within the low-pressure region where the Hooper vortex is predominant around the test specimen, and then collapse, resulting in marked shock waves by which almost all of the tiny bubbles are destroyed.

• 一般社団法人日本機械学会の論文
• 1993-11-15

著者

• OBA Risaburo

  Institute of Fluid Science, Tohoku University

• Oba Risaburo

  Institute Of Fluid Science Tohoku University

• Ahmed Mohamed

  Assuite University

• Miyazaki Kei

  Former Student, Graduate School of Engineering, Tohoku University

• Miyazaki Kei

  Former Student Graduate School Of Engineering Tohoku University

関連論文

• Jet Structure Analyses on High-Speed Submerged Water Jets through Cavitation Noises
• Several Kinds Vibrations Arisen around a Typical Highspeed SupercavitatingHydrofoil with Various Nose Shapes
• Appearance of Cavitation and Cavitation-Acoustic-Pulses (Especially in Decelerated-and Accelerated-Flow)
• Singular Behavior of Erosion-Standoff-Distance-Curves for Highspeed-Water-Jets in Air
• Behavior of Cavitation Nuclei in High-Speed Submerged Water-Jet-Tests
• Marked Change in Subcavitation-Cascade Performance Resulting from a Very Slight Modification in Leading Edges
• Spatial Distribution of Cavitation-Shock-Pressure Around a Jet-Flow Gate-Valve : Series B : Fluid Engineering, Heat Transfer, Combustion, Power, Thermophysical Properties
• Base-Vented Performance Simulation for Supercavitating Hydrofoils with Pseudo-Kirchhoff Noses Operating within the Subcavitating Region
• SEM Observation of the Vibratory Cavitation-Fracture Mode during the Incubation Period and the Small Roughness Effect
• Developing Stages of Ultrasonically Produced Cavitation Erosion and Corresponding Surface Roughness
• An Indirect Vibratory Method Capable of Simulating Several Cavitating States
• Several Trials in the Search for a Complete Cavitation Concept
• Flow Calculation of a Mixed-Flow Runner, Especially with Respect to a Marked Effect of the Blade Loading
• SEM Studies of Particles Produced by Cavitation Erosion
• Characteristics of Bubble-Collapse Pressures in a Karman-Vortex Cavity
• Spatial Distribution of Cavitation-Shock-Pressures around a Jet-Flow Gate-Valve
• Cavitation-Probable Bubbles Flowing Down from a Cavitating Branch Duct
• A Peculiar Behavior of Cavitation-Nuclei-Size Distributions in Sample Water Under Vibratory Erosion Tests
• Stochastic Behavior (Randomness) of Acoustic Pressure Pulses in the Near-Subcavitating Range : Fluids Engineering
• Peculiar Behavior of Disc Drag during Force Measurements for Supercavitating Hydrofoils
• Cavity Separations and Associated Impulsive Pressures around a Cavitating Circular Cylinder (1st Report, Vortex Cavitation in the Wake and Attached Cavitation)
• Peculiar Behavior of Disc Drag During Force Measurements for Super cavitating Hydrofoils
• Unsteady Behavior of Violent-Vibrations Depending upon Type of Cavitation
• Studies on Low-Erosion Butterfly Valves : Suppression of Erosive Vortex Cavitation
• High-Speed Observations of the Cavitation Cloud around a High-Speed Submerged Water Jet
• Suitable Region of High-Speed Submerged Water Jets for Cutting and Peening
• High-Speed Observations of the Vibratory Cavitation Accompanying Hard Erosion
• High-Speed Stereo-Observations of Violent Vibrations Associated with Three Types of Cavitation

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