{"title":"Analysis of spray particles entrance of Right-angle cold spray nozzle based on CFD","authors":"Kun Tan","doi":"10.20535/2521-1943.2023.7.3.292244","DOIUrl":null,"url":null,"abstract":"Cold spray technology is a solid-state deposition technology, and the nozzle is an important part of the cold spray system. This article proposes a right-angle nozzle. The characteristic of this nozzle is that it can change the flow direction of the gas flow inside the nozzle to realize spraying on the surface of special parts; the acceleration of particles by the right-angle nozzle with different particle entrances is studied. The results show that the outlet center velocity of the right-angle nozzle with a circular throat section is greater, the viscous boundary layer effect is better, and the effective circulation area is larger; the maximum airflow velocity near the outlet of the right-angle nozzle at the particle entrance A is 663.4m/s; it can also effectively avoid the deposition of particles inside the right-angle nozzle, thereby reducing the loss of kinetic energy during the acceleration of particles in the right-angle nozzle; the research on the structure of the new right-angle cold spray nozzle can provide reference for the nozzle of cold spray technology Opinion.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":"17 5","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mechanics and Advanced Technologies","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.20535/2521-1943.2023.7.3.292244","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Cold spray technology is a solid-state deposition technology, and the nozzle is an important part of the cold spray system. This article proposes a right-angle nozzle. The characteristic of this nozzle is that it can change the flow direction of the gas flow inside the nozzle to realize spraying on the surface of special parts; the acceleration of particles by the right-angle nozzle with different particle entrances is studied. The results show that the outlet center velocity of the right-angle nozzle with a circular throat section is greater, the viscous boundary layer effect is better, and the effective circulation area is larger; the maximum airflow velocity near the outlet of the right-angle nozzle at the particle entrance A is 663.4m/s; it can also effectively avoid the deposition of particles inside the right-angle nozzle, thereby reducing the loss of kinetic energy during the acceleration of particles in the right-angle nozzle; the research on the structure of the new right-angle cold spray nozzle can provide reference for the nozzle of cold spray technology Opinion.
冷喷技术是一种固态沉积技术,喷嘴是冷喷系统的重要组成部分。本文提出了一种直角喷嘴。该喷嘴的特点是可以改变喷嘴内气流的流动方向,实现对特殊零件表面的喷涂;研究了不同颗粒入口的直角喷嘴对颗粒的加速度。结果表明,喉部截面为圆形的直角喷嘴出口中心速度较大,粘性边界层效果较好,有效流通面积较大;颗粒入口 A 处直角喷嘴出口附近的最大气流速度为 663.4m/s;还能有效避免颗粒在直角喷嘴内的沉积,从而减少颗粒在直角喷嘴内加速时的动能损失;新型直角冷喷喷嘴结构的研究可为冷喷技术的喷嘴提供参考意见。