Unsteady Flows Arising in a Mixed-Flow Vaneless Diffuser System

Tsurusaki, Hiromu

doi:10.5293/ijfms.2008.1.1.092

Cited by 1 publication

(3 citation statements)

References 8 publications

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“…The occurrence of the high-speed mode measured in the previous study (Tsurusaki, H. [1]) was confirmed in the present study. The cause of the unsteady flows is a whirling vortex (concentration of vorticity) generated in the straight tube.…”

Section: Resultssupporting

confidence: 91%

“…Therefore, the nondimensional rotational speed for the short tube is greater than that for the long tube. The measured results confirmed that the unsteady flow corresponding to the high-speed mode in the previous experiment (Tsurusaki, H. [1]) was generated in the tested tubes. In the previous experiment, the length of the straight tube excluding the mixed-flow-type vaneless diffuser is L/d s =3.5.…”

Section: Measurement Methodssupporting

confidence: 87%

“…In these flow channels, various types of unsteady flows often arise due to the unstable swirling flow (Tsurusaki, H. [1]-Kurosaka, M. [5]). The present author found that unsteady flows occur in a mixed-flow-type vaneless diffuser system (Tsurusaki, H. [1]) that is similar to the Ranque-Hilsch tube (Kurosaka, M. [5]). Two kinds of unsteady flows, low-and high-speed modes, are generated in the flow channel.…”

Section: Introductionmentioning

confidence: 73%

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Unsteady Swirling Flows Arising in Straight Tubes

Tsurusaki¹

2010

International Journal of Fluid Machinery and Systems

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The objective of this study is to clarify the occurrence of the high-speed mode of unsteady swirling flows in straight tubes. The unsteady flows generated in the tube were measured by means of a semiconductor-type pressure transducer and an FFT analyzer. The high-speed mode measured has rotational speed which is approximately equal to or higher than the peripheral velocity of the swirling flow. The unsteady flow is due to cell rotation in the circumferential direction of the tube. The occurrence of the high-speed mode was confirmed, and the characteristics (rotational speed, pressure amplitude, and phase) of this mode were clarified. In order to understand the measured unsteady flows, the three dimensional vortex core profiles were discussed based on the distributions of the pressure amplitude and phase.

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Section: Resultssupporting

confidence: 91%

Section: Measurement Methodssupporting

confidence: 87%