Measurement and Numerical Simulation of a Small Centrifugal Compressor Characteristics at Small or Negative Flow Rate

作者：Tsukamoto Kaname^*; Okada Mizuki; Inokuchi Yuzo; Yamasaki Nobuhiko; Yamagata Akihiro

来源：Journal of Thermal Science, 2017, 26(2): 107-112.

DOI：10.1007/s11630-017-0917-8

• centrifugal compressor
• turbocharger
• measurement
• CFD
• BANS
• surge
• small flow
• negative flow

For centrifugal compressors used in automotive turbochargers, the extension of the surge margin is demanded because of lower engine speed. In order to estimate the surge line exactly, it is required to acquire the compressor characteristics at small or negative flow rate. In this paper, measurement and numerical simulation of the characteristics at small or negative flow rate are carried out. In the measurement, an experimental facility with a valve immediately downstream of the compressor is used to suppress the surge. In the numerical work, a new boundary condition that specifies mass flow rate at the outlet boundary is used to simulate the characteristics around the zero flow rate region. Furthermore, flow field analyses at small or negative flow rate are performed with the numerical results. The separated and re-circulated flow fields are investigated by visualization to identify the origin of losses.

• 出版日期2017-4