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汽车安全与节能学报

Journal Of Automotive Safety And Energy ›› 2015, Vol. 6 ›› Issue (04): 392-398.DOI: 10.3969/j.issn.1674-8484.2015.04.013

• Automotive Energy Efficiency & Environment Protection • Previous Articles     Next Articles

Numerical investigation of flow field for transonic centrifugal compressor with blade leading edge forward sweep

LIU Yanming1, CUI Qing1, ZHENG Xinqian2, GUO Longkai1   

  1. 1. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2015-09-07 Online:2015-12-25 Published:2015-12-28

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Abstract:

Three turbo-charged transonic centrifugal compressors were designed with different forward-swept
angles (10°, 15°, 20°) of blade leading edge by means of the commercial software Concepts NREC. Numerical
simulation and comparative analysis were conducted to investigate the influence of blade leading edge forward
sweep on the flow field characteristics in the compressors. The results show that the compressors with forwardswept
main blade possess certain advantages in flow capacity and stall margin over unswept compressor, the
scheme of 15° has the largest flow capacity, and the scheme of 20° has the biggest stall margin. As forwardswept
angle increases from 0°to 20°, the passage shock strength decreases 7.2% under the choke condition,
while decreases 3.4% under the peak efficiency condition; the range and strength of low-energy flow mass in
impeller channel are improved in some degree. The scheme of 10° is the optimal scheme among the 3 different
forward-swept blades with the compressor efficiency increasing by 0.72% and pressure ratio increasing by 0.62%.

Key words: centrifugal compressors, forward-swept leading edge, flow field characteristics, shock wave structure, low-energy fluid