Effect of Double Air Injection on Instability Phenomena in Centrifugal Compressor

• 作者: Hoshio Tsujita Tatsuya Ogawa Toshiyuki Hirano
• 来源期刊: 流体动力学(英文)
• 学科: 医学
• 关键词: CENTRIFUGAL COMPRESSOR Performance NOZZLE Injection SURGE
• 年，卷（期）: 2017,（3）
• 页码范围: 462-474
• 页数: 13页
• 分类号: R73

摘要

In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, the compressed air at the exit of centrifugal compressor was re-circulated and injected to the impeller inlet by using two injection nozzles in order to suppress the surge phenomenon. The most effective circumferential position was examined to reduce the flow rate at the surge inception. Moreover, the influences of the injection on the fluctuating property of the flow field before and after the surge inception were investigated by examining the frequency of static pressure fluctuation on the wall surface and visualizing the compressor wall surface by oil-film visualization technique.