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Keywords: impellers
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Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041019.
Published Online: July 25, 2011
... stage, the outer diameter was reduced by 14%. The outer radius of the smallest design was limited by the impeller exit diameter, which was kept constant, as was the axial length of the stage. The large radius baseline design has been tested on a rotating rig in a 1.5 stage setup. This setup aimed...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041011.
Published Online: July 21, 2011
... parameters, including inlet Mach number, inlet distortion, wave number, diffuser outlet-to-inlet radius ratio, diffuser width to inlet radius ratio, and impeller backswept angle, on the rotating waves are presented. It was found that inlet spanwise distortion of radial velocity has little effects on diffuser...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041012.
Published Online: July 21, 2011
... ( Shibata et al., “Performance Improvement of a Centrifugal Compressor Stage by Increasing Degree of Reaction Optimizing Blade Loading of a 3D-Impeller,” ASME Paper No. GT2009-59588 ). In spite of such a high relative velocity diffusion ratio, the same surge margin as with a conventional design was able...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021006.
Published Online: June 22, 2011
... explores alternative vane geometries for further improvement of the impeller inlet flow conditions. The purpose is to postpone flow separation to higher stagger angles. Tandem vanes ( 8 9 ) with fixed leading parts and rotating trailing parts and asymmetric vanes ( 10 11 ) are two alternatives...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041018.
Published Online: April 25, 2011
...Xuwen Qiu; David Japikse; Jinhui Zhao; Mark R. Anderson This paper presents a unified slip model for axial, radial, and mixed-flow impellers. The core assumption of the model is that the flow deviation or the slip velocity at the impeller exit is mainly originated from the blade loading near...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021004.
Published Online: October 19, 2010
...Takanori Shibata; Manabu Yagi; Hideo Nishida; Hiromi Kobayashi; Masanori Tanaka Performance improvement of 3D impellers in a high specific speed range was investigated using computational fluid dynamics analyses and experimental tests. In order to reduce the loss production within the stator...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2011, 133(1): 011025.
Published Online: September 27, 2010
... is a significant challenge when applying Reynolds averaged Navier–Stokes turbulence modeling techniques. The current study compares the steady-state mixing plane predictions using four turbulence models for a centrifugal compressor stage with a tandem impeller and a “fish-tail” style discrete passage diffuser...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2010, 132(4): 041012.
Published Online: May 5, 2010
...Michele Marconcini; Filippo Rubechini; Andrea Arnone; Seiichi Ibaraki A three-dimensional Navier–Stokes solver is used to investigate the flow field of a high pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031004.
Published Online: March 24, 2010
...T. Verstraete; Z. Alsalihi; R. A. Van den Braembussche A multidisciplinary optimization system and its application to the design of a small radial compressor impeller are presented. The method uses a genetic algorithm and artificial neural network to find a compromise between the conflicting...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021005.
Published Online: January 11, 2010
... on the turbulence field evolution inside the impeller. LES predictions suggest that the Boussinesq hypothesis does not seem to be valid, especially near the exit of the impeller where the blade unloading takes place. Reynolds stress variations show a tendency toward an “axisymmetric expansion” type of turbulence...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2009, 131(3): 031012.
Published Online: April 10, 2009
...Z. S. Spakovszky; C. H. Roduner In turbocharger applications, bleed air near the impeller exit is often used for secondary flow systems to seal bearing compartments and to balance the thrust load on the bearings. There is experimental evidence that the performance and operability of highly-loaded...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2008, 130(3): 031013.
Published Online: May 5, 2008
... constraints, whose performance is at the same level as standard pumps of the same class. 15 01 2007 22 02 2007 05 05 2008 aerodynamics computational fluid dynamics design engineering impellers numerical analysis pumps In recent years, the industrial process related...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2008, 130(3): 031009.
Published Online: May 2, 2008
... on the flow structure at the impeller exit in part load operation. The kind of compressor described herein is widely used in distributed power applications and automotive turbocharging. It demands further enhancement of the operation range, as well as a high head rise and an improved efficiency. Therefore...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2008, 130(1): 011014.
Published Online: January 25, 2008
... distortion at off design operation is slightly larger than in the original configuration with a concentric vaneless diffuser. Alternatively, a parallel-walled diffuser with low-solidity vanes and an internal volute allows a reduction of the unsteady load on the impeller and an improved performance...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2008, 130(1): 011010.
Published Online: January 14, 2008
...Michele Marconcini; Filippo Rubechini; Andrea Arnone; Seiichi Ibaraki A three-dimensional Navier-Stokes solver is used to investigate the flow field of a high-pressure ratio centrifugal compressor for turbocharger applications. Such a compressor consists of a double-splitter impeller followed...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2007, 129(4): 686–693.
Published Online: August 11, 2006
... compressor, it is required to optimize not only the impeller but also the diffuser. However the flow field of the diffuser is quite complex and unsteady because of the impeller located upstream. Although some research on vaned diffusers has been published, the diffuser flow is strongly dependent...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2007, 129(2): 421–433.
Published Online: August 9, 2006
...A. Hildebrandt; M. Genrup This paper presents a numerical investigation of the effect of different back sweep angles and exducer widths on the steady-state impeller outlet flow pattern of a centrifugal compressor with a vaneless diffuser. The investigations have been performed with commercial...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2006, 128(1): 1–10.
Published Online: August 10, 2005
...Theodor W. von Backström A method that unifies the trusted centrifugal impeller slip factor prediction methods of Busemann, Stodola, Stanitz, Wiesner, Eck, and Csanady in one equation is presented. The simple analytical method derives the slip velocity in terms of a single relative eddy (SRE...
Journal Articles
Article Type: Technical Papers
J. Turbomach. October 2005, 127(4): 755–762.
Published Online: May 10, 2005
...Yasushi Tatebayashi; Kazuhiro Tanaka; Toshio Kobayashi The authors have been investigating the various characteristics of screw-type centrifugal pumps, such as pressure fluctuations in impellers, flow patterns in volute casings, and pump performance in air-water two-phase flow conditions. During...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2006, 128(3): 455–465.
Published Online: February 1, 2005
.... The unsteady flow has been analyzed to obtain detailed insight into the excitation mechanism. Therefore, a turbocharger compressor stage impeller has been modeled and simulated by means of computational fluid dynamics (CFD). Two operating points at off-design conditions were analyzed. One was close to choke...