Effect of Interstage Pipeline on the Performance of Two-Stage Centrifugal Compressors for Automotive Hydrogen Fuel Cells

At present, two-stage centrifugal compressors based on air bearing and high-speed motor technology are widely used in automotive hydrogen fuel cells. The low-pressure stage high-pressure of the compressor directly connected through an interstage pipeline, thus structure pipeline has important influence aerodynamic performance compressor. In this work, a with three different pipelines were investigated experimentally numerically. Results show that affected by bend section, flow distortion will be induced at impeller inlet stage, intensity changes structure. Among models, EPC (elbow pipe change) model induces most intense total pressure condition 80 kr/min 130% mass rate, resulting efficiency reduction 2 1.5 percentage points compared SPC (straight TPC (total model, respectively. Further research indicates upstream obvious downstream rotor blades. As blade height decreases, load becomes more uniform main blades, while extremum migrates to trailing edge splitter Finally, models tested, their is typical rotational speeds., It recommended similar should chosen improve design.