带90_弯管的离心压气机进口畸变数值研究.pdf

25 11 Vol.25 No. 11 2010 11 Journalof AerospacePower Nov. 2010 : 1000-8055(2010) 11-2556-08 90 李 杜, 杨 策, 陈 山, 祁明旭 ( , 100081) : 90, , . ,, . ,. , . , , , . , , . : ; ; ; ; : TK474 : A Numerical simulationoninlet distortionof centrifugal compressor with90bent pipe LI Du, YANG e, HEN Shan, QI Ming-xu (School of Mechanical Engineering, Beijing Institute of T echnology, Beijing 100081, hina) Abstract: T o understand the effects of centrifugal compressor inlet distortion caused by 90bent pipe, two different axial position inlet bent pipes were numerically simulated with compressor and the influence on compressor performance was analyzed. T he results show different performance deterioration between different bent pipes, the larger distance between bent pipe outlet and impeller inlet leads to more decrease. T he bent pipe makes theflow field of impeller inlet strongly disorderly. The distortion causes a noticeable decline in compressor performance under large mass flow rate and a slight drop at low mass flow rate. T he effect of inlet distortion amplifies and develops to the volute inlet while the mass flow rate increases, which functions together with circumferential distortion caused by volute tongue, resulting in decrease of the performance. When the mass flow rate is low, the inlet distortion reduces the flow loss in impeller passage, helping to maintain the performance of compressor at low mass flow rate. Keywords: inlet distortion; bent pipe; centrifugal compressor; numerical simulation; flow field structure . , . , ,