Experimental Research on Surge of Small-size High-speed Centrifugal Compressor

In order to clarify the surge mechanism,the experiment was carried out on the vaneless diffuser centrifugal compressor that was used by turbocharger.The experiment results indicate that the surge frequency is related to not only the volume of discharge pipeline but also the rotating speed of compressor.The surge frequency is reduced with the increase of rotating speed.The critical mass flow is increased with the increase of discharge pipeline volume and has linear increasing relation with rotating speed.For the system with larger pipeline volume,the mass flow of exiting surge area is noticeably higher than that of entering surge area.