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

作　　者：Syed Noman Danish Shafiq Rehman Qureshi Abdelrahman EL-Leathy Salah Ud-Din Khan Usama Umer Ma Chaochen 

机构地区：[1]Sustainable Energy Technologies Center,King Saud University [2]National University of Sciences and Technology,PNS Jauhar,Karachi,Pakistan [3]Mechanical Engineering Department,King Saud University [4]FARCAMT,Advanced Manufacturing Institute,King Saud University [5]Beijing Institute of Technology

出　　处：《Journal of Thermal Science》2014年第6期523-534,共12页热科学学报（英文版）

基　　金：the Deanship of Scientific Research,Research Center of College of Engineering, King Saud University for the financial support

摘　　要：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.

关 键 词：tandem blade conventional compressor INDUCER exducer numerical simulation 

分 类 号：TH452[机械工程—机械制造及自动化] V232.4[航空宇航科学与技术—航空宇航推进理论与工程]