Behavior of Vaneless Diffuser Stall in a Centrifugal Compressor
Behavior of Vaneless Diffuser Stall in a Centrifugal Compressor
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离心压缩机中无叶扩压器失速的行为
DOI：
10.1007/s11630-022-1557-1
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发表时间：
2022
影响因子：
2.5
通讯作者：
Ohta Yutaka
中科院分区：
文献类型：
--
作者：
Agari Yuki;Yamao Yoshifumi;Fujisawa Nobumichi;Ohta Yutaka
对无叶扩压器离心压气机的旋转失速进行了实验研究和数值模拟，重点研究了叶轮内部流场对扩压器失速的影响。通过数值分析，发现叶轮出口边界层分离在扩压器失速的膨胀和旋转过程中起着重要作用。特别是，在主叶片（M. B.）吸力面通道被认为是膨胀和旋转过程的主要原因。M. B喉部存在纵向涡。通道中的质量流率，以及M.B.通道由于阻塞效应而显著减少。此外，纵向涡在叶轮出口处的轮毂侧附近诱发了卷起流动。因此，边界层分离扩大。
The rotating stall in a centrifugal compressor with a vaneless diffuser was investigated both experimentally and numerically with focus on the effect of the internal flow field within the impeller on the diffuser stall. Through numerical analysis, the boundary layer separation at the impeller outlet was found to play an important role in the expansion and rotation processes of the diffuser stall. In particular, the expanded boundary layer separation near the hub side at the outlet of the main blade (M.B.) suction surface passage was considered to be the main cause of the expansion and rotation processes. A longitudinal vortex existed at the throat of the M.B. passage, and the mass flow rate in the M.B. passage was significantly reduced by the blockage effect. In addition, the longitudinal vortex induced the rolling up flow near the hub side at the impeller exit. Thus, the boundary layer separation expanded.
影响因子：
0.9
作者：
N. Fujisawa;K. Tajima;H. Miida;Y. Ohta
通讯作者：
N. Fujisawa;K. Tajima;H. Miida;Y. Ohta