Numerical Investigation %26 Comparison of a Tandem-Bladed Turbocharger Centrifugal Compressor Stage with Conventional Design

作者：Danish Syed Noman^*; Qureshi Shafiq Rehman; El Leathy Abdelrahman; Khan Salah Ud Din; Umer Usama; Ma Chaochen

来源：Journal of Thermal Science, 2014, 23(6): 523-534.

DOI：10.1007/s11630-014-0737-z

• tandem blade
• conventional compressor
• inducer
• exducer
• numerical simulation

Extensive numerical investigations of the performance and flow structure in an unshrouded tandem-bladed centrifugal compressor are presented in comparison to a conventional compressor. Stage characteristics are explored for various tip clearance levels, axial spacings and circumferential clockings. Conventional impeller was modified to tandem-bladed design with no modifications in backsweep angle, meridional gas passage and camber distributions in order to have a true comparison with conventional design. Performance degradation is observed for both the conventional and tandem designs with increase in tip clearance. Linear-equation models for correlating stage characteristics with tip clearance are proposed. Comparing two designs, it is clearly evident that the conventional design shows better performance at moderate flow rates. However; near choke flow, tandem design gives better results primarily because of the increase in throat area. Surge point flow rate also seems to drop for tandem compressor resulting in increased range of operation.

• 出版日期2014-12
• 单位北京理工大学