Investigation on inlet recirculation characteristics of double suction centrifugal compressor with unsymmetrical inlet

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• 作者：Ce Yang ; Yingjun Wang ; Dazhong Lao ; Ding Tong ; Longyu Wei…
• 刊名：Journal of Thermal Science
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：25
• 期：4
• 页码：312-324
• 全文大小：1,754 KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Engineering Thermodynamics and Transport Phenomena
  Chinese Library of Science
  
• 出版者：Science Press, co-published with Springer-Verlag GmbH
• ISSN：1993-033X
• 卷排序：25

文摘

The inlet recirculation characteristics of double suction centrifugal compressor with unsymmetrical inlet structures were studied in numerical method, mainly focused on three issues including the amounts and differences of the inlet recirculation in different working conditions, the circumferential non-uniform distributions of the inlet recirculation, the recirculation velocity distributions of the upstream slot of the rear impeller. The results show that there are some differences between the recirculation of the front impeller and that of the rear impeller in whole working conditions. In design speed, the recirculation flow rate of the rear impeller is larger than that of the front impeller in the large flow range, but in the small flow range, the recirculation flow rate of the rear impeller is smaller than that of the front impeller. In different working conditions, the recirculation velocity distributions of the front and rear impeller are non-uniform along the circumferential direction and their non-uniform extents are quite different. The circumferential non-uniform extent of the recirculation velocity varies with the working conditions change. The circumferential non-uniform extent of the recirculation velocity of front impeller and its distribution are determined by the static pressure distribution of the front impeller, but that of the rear impeller is decided by the coupling effects of the inlet flow distortion of the rear impeller, the circumferential unsymmetrical distribution of the upstream slot and the asymmetric structure of the volute. In the design flow and small flow conditions, the recirculation velocities at different circumferential positions of the mean line of the upstream slot cross-section of the rear impeller are quite different, and the recirculation velocities distribution forms at both sides of the mean line are different. The recirculation velocity distributions in the cross-section of the upstream slot depend on the static pressure distributions in the intake duct.Keywordsasymmetric intakedouble suction centrifugal compressorinlet recirculationrecirculation flowcircumferential distribution