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	Unsteady Behavior of Leading-edge Vortex and Diffuser Stall in a Centrifugal Compressor with Vaned Diffuser
	Fujisawa, N., Hara, S. and Ohta, Y.1
	2016
关键词	Centrifugal Compressor Vaned Diffuser Rotating Stall Leading-edge Vortex CFD DES flow Thermodynamics Engineering
中文摘要	The characteristics of a rotating stall of an impeller and diffuser and the evolution of a vortex generated at the diffuser leading-edge (i.e., the leading-edge vortex (LEV)) in a centrifugal compressor were investigated by experiments and numerical analysis. The results of the experiments revealed that both the impeller and diffuser rotating stalls occurred at 55 and 25 Hz during off-design flow operation. For both, stall cells existed only on the shroud side of the flow passages, which is very close to the source location of the LEV. According to the CFD results, the LEV is made up of multiple vortices. The LEV is a combination of a separated vortex near the leading-edge and a longitudinal vortex generated by the extended tip-leakage flow from the impeller. Therefore, the LEV is generated by the accumulation of vorticity caused by the velocity gradient of the impeller discharge flow. In partial-flow operation, the spanwise extent and the position of the LEV origin are temporarily transmuted. The LEV develops with a drop in the velocity in the diffuser passage and forms a significant blockage within the diffuser passage. Therefore, the LEV may be regarded as being one of the causes of a diffuser stall in a centrifugal compressor.
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/113095]
专题	工程热物理研究所_Journal of Thermal Science_期刊论文
作者单位	1.[Fujisawa, Nobumichi 2.Hara, Shotaro] Waseda Univ, Grad Sch Fundamental Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan. [Ohta, Yutaka] Waseda Univ, Dept Appl Mech & Aerosp Engn, Shinjuku Ku, Tokyo 1698555, Japan.
推荐引用方式 GB/T 7714	Fujisawa, N., Hara, S. and Ohta, Y.. Unsteady Behavior of Leading-edge Vortex and Diffuser Stall in a Centrifugal Compressor with Vaned Diffuser[J],2016.
APA	Fujisawa, N., Hara, S. and Ohta, Y..(2016).Unsteady Behavior of Leading-edge Vortex and Diffuser Stall in a Centrifugal Compressor with Vaned Diffuser..
MLA	Fujisawa, N., Hara, S. and Ohta, Y.."Unsteady Behavior of Leading-edge Vortex and Diffuser Stall in a Centrifugal Compressor with Vaned Diffuser".(2016).

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