CAJ | 학술논문

本文以国内某工程用离心压缩机为研究对象，采用商用软件 ANSYS-CFX选用SST湍流模型，对压缩机离心叶轮及无叶扩压器内部流动通道进行三维造型，采用三维定常与非定常计算方法，得到该叶轮的性能曲线和内部流场的基本特征。进而对其在小流量状况下叶顶间隙的非稳定流动特性进行了分析，对比了两种非定常计算方法：一种为出口边界都给定常值的非定常计算；另一种为出口压力边界设置为随时间增加，逐渐逼近失速的非定常计算，所得到的结论有助于分析其非稳定流动的发展规律。
본문이국내모공정용리심압축궤위연구대상，채용상용연건 ANSYS-CFX선용SST단류모형，대압축궤리심협륜급무협확압기내부류동통도진행삼유조형，채용삼유정상여비정상계산방법，득도해협륜적성능곡선화내부류장적기본특정。진이대기재소류량상황하협정간극적비은정류동특성진행료분석，대비료량충비정상계산방법：일충위출구변계도급정상치적비정상계산；령일충위출구압력변계설치위수시간증가，축점핍근실속적비정상계산，소득도적결론유조우분석기비은정류동적발전규률。
Based on a centrifugal compressor for an enginering application in domestic, ANSYS-CFX with SST turbulent model is used to carry out the three-dimensional modeling on the internal flow field of centrifugal impeller and bladeless diffuser. The three-dimensional steady and unsteady calculation method is used to obtain the performance curves of the impeller and the basic features of internal flow field. Then the unsteady flow characteristic of tip clearance under low flow condition is analyzed. The two kinds of unsteady calculation methods are compared. One is the outlet boundary given constant value; the other one is the outlet pressure boundary set to gradually approach to stall as time increasing. The obtained conculsion will be helpful for analyzing the devoloping rule of its unsteady flow.