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Experimental Study on a New Test Apparatus for the Surface Damages Combined with Slurry Wear and Cavitation Erosion

新型泥浆磨损与空蚀结合表面损伤测试装置的实验研究

基本信息

批准号：
02555034
负责人：
IWAI Yoshiro
金额：
$ 4.16万
依托单位：
Fukui University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02555034/
关键词：
Material testing Slurry wear Cavitation erosion Combined damage Nozzle jet wear test Vibratory cavitation erosion test Solid particle

项目摘要

1. A new test apparatus was constructed by combining an ultrasonic vibratory cavitation device and a slurry jet device in order to study combined damages with slurry wear and cavitation erosion. Experimental results were obtained as follows.(1)When cavitation and slurry erosions are combined, the damage loss increases in proportion to time without an incubation period because solid particles remove the surface successively and does not coincide with simple summation of each damage loss. Under low jet flow velocity, cavitation erosion is reduced by solid particles. When jet flow velocity is high, cavitation bubbles flow out from the surface and the solid particles remove the plastic deformations in which produce the erosion debris, thus the cavitation erosion is diminished.(2)Cavitation erosion increases in water containing solid particles. The degree of the increase of damage is larger for angular particles such as abrasives and silica sands than glass beads. With increasing particle size, the damage shows a maximum at a given value and decreases.2. The test method which slurry jet containing cavitation bubbles acts on the stationary specimen was developed. The combined damage is larger than slurry wear.3. An air-blast erosion test apparatus was constructed in order to investigate the characteristics of wear caused by a stream of impinging solid particles. The wear of materials by impacts of solid particles at room and high temperatures could be estimated from the impinging conditions and the properties of materials and particles.From these results, it is found that the test apparatuses developed in this study are very useful to investigate the slurry wear and the damages combined with slurry wear and cavitation erosion.

1.为了研究浆体磨损和空蚀的复合损伤，将超声振动空蚀装置与浆体射流装置相结合，构建了一套新的试验装置。实验结果如下。（1）当空蚀和浆体冲蚀联合作用时，由于固体颗粒连续地去除表面，而不符合每种损伤损失的简单加和，因此损伤损失与时间成比例地增加，没有孕育期。在较低的射流流速下，固体颗粒的存在减轻了空蚀。当射流速度较高时，空蚀气泡从表面流出，固体颗粒消除了产生冲蚀碎片的塑性变形，从而减轻了空蚀。（2）在含有固体颗粒的水中，空蚀加剧。角形颗粒如磨料和硅砂的损伤增加程度大于玻璃珠。随着颗粒尺寸的增大，损伤在某一给定值处出现最大值，然后减小.提出了含空化气泡的浆体射流作用于静止试件的试验方法。复合损伤大于浆体磨损.为了研究固体颗粒冲击磨损的特性，建立了一套气流冲蚀磨损试验装置。研究结果表明，本文所研制的试验装置可用于研究浆体磨损以及浆体磨损和空蚀复合损伤。