Affiliation:
1. Sugino Machine Limited, 2880 Kuriyama, Namerikawa-shi, Toyama 936-8577, Japan
2. Department of Finemechanics, Tohoku University, 6-6-01 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
Abstract
Abstract
It is known that the geometry of the nozzle has a great effect on the aggressive intensity of a cavitating jet. In previous reports, various nozzle geometries were proposed, and improvements made to the aggressive intensity were reported. However, no detailed description of the reasons why the aggressive intensity is improved by these various geometries was given. In this study, we conducted erosion tests on pure aluminum Japanese Industrial Standards JIS A1050P using 11 different nozzles with different geometries downstream from the throat outlet in order to understand the effects of the nozzle geometry on the aggressive intensity. In addition, in order to investigate the characteristics of the cavitating jet produced by each nozzle, measurements of the erosion areas, images of the cavitating jet using a high-speed video camera, and measurements of the impingement pressure of the cavitating jet were taken, and correlations between the parameters were obtained. It was found that the nozzle with the largest mass loss was a nozzle with water flow holes near to the throat outlet and a long guide pipe (LGP). The mass loss was 2.5 times that of the previously reported optimum geometry nozzle. Very high correlations were obtained between the mass loss, the inner diameter of the annular erosion area, the impingement pressure measured at the same standoff distance and the cavitation cloud lifetime. Based on these results and the images of the cavitating jets taken with the high-speed video camera, a new cavitating jet progression process is proposed.
Reference49 articles.
1. Cavitation Damage,1963
2. Marked Peening Effects of Highspeed Submerged-Water-Jets—Residual Stress Change on SUS304;J. Jet Flow Eng. Jpn.,1996
3. Effect of Water Jet Peening on Corrosion Resistance and Fatigue Strength of Type 304 Stainless Steel;J. Soc. Mater. Sci. Jpn.,1996
4. Improvement of Fatigue Strength of Aluminum Alloy by Cavitation Shotless Peening;J. Eng. Mater. Technol.,2002
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献