Research on the effect of Mach number on surge limit of centrifugal compressor

涡轮机械失速引起的现象在风机和压缩机之间有很大的不同。在压气机中，存在压力振荡较大的喘振现象，如何避免喘振现象是一个非常重要的问题。本文利用涡轮增压器压气机，实验研究了转速对喘振现象的影响。随着转速的增加，喘振区域迅速扩大，并在50000rpm以上进一步突然扩大。对储罐容积和管道长度的影响也进行了测试，发现它们对喘振现象有很大的影响。特别是在20000rpm工况下，在较短的管道长度为2.0m时，喘振被证明是可以熄灭的。

The phenomena caused by the stall of turbo machinery is greatly different between fan and compressor. In case of compressor, surge phenomena with large pressure oscillation occur and the avoidance of it is very important issue. In this research, the effect of rotational speed on surge phenomena is investigated experimentally by using compressor of turbo charger.As rotational speed is increased, it became clear that the surge region expands rapidly and it further expands abruptly above 50000rpm.The effect of tank volume and pipe length is also tested and found that they have large influence on surge phenomena. Especially surge is proved to be extinguished at shorter pipe length of 2.0m under 20000 rpm operation.