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http://dx.doi.org/10.5293/kfma.2012.15.2.045

The Flow Characteristics in a Vaneless Diffuser by PIV Measurements  

Yoon, Ji-In (한국과학기술연구원 에너지메카닉스연구센터)
Shin, You-Hwan (한국과학기술연구원 에너지메카닉스연구센터)
Lee, Yoon-Pyo (한국과학기술연구원 에너지메카닉스연구센터)
Kim, Kwang-Ho (한국과학기술연구원 에너지메카닉스연구센터)
Publication Information
The KSFM Journal of Fluid Machinery / v.15, no.2, 2012 , pp. 45-50 More about this Journal
Abstract
The flow characteristics in a vaneless diffuser with a backswept radial impeller have been experimentally investigated according to the variation of discharge flow rate. Particle image velocimetry(PIV) system was applied to measure velocity fields with several operating conditions and on some diffuser horizontal planes. Pressure transducers were installed on hub wall of the diffuser in order to analyze the pressure fluctuations and their corresponding velocity fields. The results show that the location of the main flow center moves from the hub to the shroud side as the flow rate decreases, and the reverse flow is locally generated on the hub side.
Keywords
PIV; Vaneless diffuser; Centrifugal impeller; Flow field;
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