NDLI: The Effects of Casing Geometry and Flow Instability on Rotordynamic Fluid Forces on a Closed Type Centrifugal Impeller in Whirling Motion

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hata, Shinichiro Richert, Julien Nishiyama, Yumeto Horiguchi, Hironori Tujimoto, Yoshinobu
Copyright Year	2011
Abstract	The rotordynamic fluid forces on a closed type centrifugal impeller in whirling motion were measured with a vaneless diffuser at various flow rates for three types of casing, with the casing/impeller shroud clearance of 2[mm], 5[mm], and 5[mm] with seven radial grooves to break the flow swirl. The rotordynamic fluid forces are destabilizing within small positive whirl speed ratio Ω/ω, where Ω and ω are a whirling speed and a rotational speed of the shaft, respectively. The radial grooves were effective to reduce the fluid forces and the destabilizing region due to the reduction of the circumferential velocity of the clearance flow. At low flow rates, the fluid forces increased at Ω/ω, ≈ 0.7. By the measurement of unsteady pressure on the casing wall and the CFD analysis of flow field in the pump, it was found that the large fluid forces at Ω/ω ≈ 0.7 were caused by the rotating stall of the impeller. The rotating stall was caused by the backflow along the suction surface of the main blade due to the separation vortices near the middle of the chord.
Sponsorship	Fluids Engineering Division
Starting Page	113
Ending Page	119
Page Count	7
File Format	PDF
ISBN	9780791844403
DOI	10.1115/AJK2011-06022
Volume Number	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
Conference Proceedings	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
Language	English
Publisher Date	2011-07-24
Publisher Place	Hamamatsu, Japan
Access Restriction	Subscribed
Subject Keyword	Suction Vaneless diffusers Whirls Blades Computational fluid dynamics Clearances (engineering) Separation (technology) Flow (dynamics) Pressure Geometry Fluids Pumps Impellers Vortices Chords (trusses) Flow instability
Content Type	Text
Resource Type	Article

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