CAJ | 학술논문

以涡轮增压器56 mm离心压气机为研究对象,采用定常流动求解方法,对其三种不同转速下的工作特性进行了预测并与实验进行了对比分析;应用相延迟方法,对高转速近失速点工况下压气机内部的三维非定常流动进行了数值模拟及频谱分析,对叶轮流道、无叶扩压器以及蜗壳内的流动频谱特性进行了初步分析.频域分析表明,对于本文所研究的离心压气机,非定常脉动特性主要表现在叶轮流道中,是诱发压气机气动噪声的主要因素,而在蜗壳内,非定常脉动特性显著减弱.
이와륜증압기56 mm리심압기궤위연구대상,채용정상류동구해방법,대기삼충불동전속하적공작특성진행료예측병여실험진행료대비분석;응용상연지방법,대고전속근실속점공황하압기궤내부적삼유비정상류동진행료수치모의급빈보분석,대협륜류도、무협확압기이급와각내적류동빈보특성진행료초보분석.빈역분석표명,대우본문소연구적리심압기궤,비정상맥동특성주요표현재협륜류도중,시유발압기궤기동조성적주요인소,이재와각내,비정상맥동특성현저감약.
Performances prediction using steady RANS solver and validation are performed on a 56 mm turbocharger compressor under three working speed-line in this paper.Unsteady flow simulation in near-surge condition at a high rotation speed is then carried out and frequency-amplitude characteristics in an impeller,vaneless diffuser and volute are studied.Results show that unsteady effect lies mainly in an impeller and is the main reason for inducing aero-acoustics in a centrifugal compressor,while in the volute,unsteady effects decrease significantly and has less contribution to acoustics level.