Specifications

Volume: 15
Issue: PART 6
Monograph title: 26th IAHR Symposium on Hydraulic Machinery and Systems - Session 4:
Advances in Computational and Experimental Techniques
Issue date: 2012
Publication year: 2012
Article number: 062051
Language: English
ISSN: 17551307
E-ISSN: 17551315
Document type: Conference article (CA)
Conference name: 26th IAHR Symposium on Hydraulic Machinery and Systems
Conference date: August 19, 2012 - August 23, 2012
Conference location: Beijing, China
Conference code: 95632
Publisher: Institute of Physics Publishing, Temple Circus, Temple Way, Bristol, BS1 6BE, United
Kingdom
Abstract: Mixed flow pump is wildly used in many field, the performance of the whole pump is
affected by the flow in the impeller to a great extend. To make clear the flow phenomena in the
mixed flow impeller at design and off-design flow rate condition, a mixed flow unshrouded
impeller was manufactured and the flow in the impeller at design and off-design flow rate was
experimental measured by Particle Image Velocimetry (PIV) in this paper. In the experiment test
device, the volute was specially design and manufactured by transparent material. According to
the experimental result, the distribution of time-average relatively velocity showed the velocity
near blade pressure surface at design flow rate decreases and then increases from inlet to outlet
of the impeller, and that near blade suction surface increase and then decreases. The velocity
near the suction surface decrease from hub to casing, and the minimal velocity appears near the
casing and suction surface. Near the impeller outlet, the relative velocity near blade pressure
surface varies a little alone the span direction; Back-flow phenomena were found at passages
outlet near casing and mid-span sections at partial flow rate. To clarify the effect of volute
geometry on the velocity distribution, the flow in different impeller passages relatively to the
volute tongue was test and the result showed that the velocity distribution in different passages
was similar. © Published under licence by IOP Publishing Ltd.
Number of references: 7
Main heading: Impellers
Controlled terms: Design - Flow rate - Hydraulic machinery - Velocity - Velocity
distribution
Uncontrolled terms: Blade pressure - Blade suction surface - Design flow rate -
Experiment tests - Experimental studies - Flow Phenomena - Flow rate conditions -
Impeller outlet - Impeller passage - Mixed flow pump - Mixed flows - Mixed-flow
impeller - Mixed-flow pump impellers - Off designs - Partial flow rate - Particle
image velocimetries - Relative velocity - Suction surfaces - Time-averages -
Transparent material - Unshrouded impellers
Classification code: 408 Structural Design - 601.2 Machine Components - 631 Fluid Flow