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Keywords: stators
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Journal Articles
Article Type: Research Papers
J. Fluids Eng. May 2011, 133(5): 051104.
Published Online: June 7, 2011
... pressure in the stator are performed along with high-speed flow visualizations in the vaneless gap with the help of air bubbles injection. When starting from the best efficiency point (BEP) and increasing the impeller speed, a significant increase of the pressure fluctuations is observed mainly...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. April 2011, 133(4): 041102.
Published Online: May 12, 2011
...Stephen A. Huyer; Amanda Dropkin This paper presents a computational study to better understand the underlying fluid dynamics associated with various duct shapes and the resultant impact on both total vehicle drag and propulsor efficiency. A post-swirl propulsor configuration (downstream stator...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. April 2011, 133(4): 041101.
Published Online: May 11, 2011
... openings. A certain number of channels is blocked (rotating stall cell) while the other channels comprise sound flow. Due to a momentum exchange between rotor and stator at the front and the rear cell boundary, the cell is rotating with subsynchronous frequency of about 60 percent of the rotational speed...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2010, 132(11): 111101.
Published Online: November 18, 2010
...M. Pau; G. Paniagua Ensuring an adequate life of high pressure turbines requires efficient cooling methods such as rim seal flow ejection from the stator-rotor wheel space cavity interface, which prevents hot gas ingress into the rotor disk. The present paper addresses the potential to improve...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. February 2010, 132(2): 021106.
Published Online: February 16, 2010
...Mihael Sekavčnik; Tine Gantar; Mitja Mori In this paper, we present an experimental and numerical investigation of a single-stage centripetal pump (SSCP). This SSCP is designed to operate in the pump regime, while forcing the working media through impeller-stator flow channels in the radial inward...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. February 2010, 132(2): 021101.
Published Online: February 3, 2010
...Stephen A. Huyer; Amanda Dropkin; James Dick; David Beal A computational study was performed to investigate a method to generate vehicle maneuvering forces from a propulsor alone. A ducted, preswirl propulsor was configured with an upstream stator row and downstream rotor. During normal operation...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. March 2008, 130(3): 031101.
Published Online: March 3, 2008
...Jesús Manuel Fernández Oro; Katia María Argüelles Díaz; Carlos Santolaria Morros; Eduardo Blanco Marigorta This paper is conceived as an extension in the analysis of the periodic stator-rotor interaction in a low-speed axial fan with inlet guide vanes. Here, the present work focuses...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. November 2007, 129(11): 1428–1435.
Published Online: May 26, 2007
...C. G. Rodriguez; E. Egusquiza; I. F. Santos The highest vibration levels in large pump turbines are, in general, originated in the rotor stator interaction (RSI). This vibration has specific characteristics that can be clearly observed in the frequency domain: harmonics of the moving blade passing...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. November 2007, 129(11): 1468–1477.
Published Online: May 14, 2007
...Sven König; Bernd Stoffel A comprehensive investigation was carried out using two different experimental setups: A 1.5-stage axial turbine and a simplified model, a “spoked-wheel” setup with a rotating wake generator consisting of cylindrical bars. The second stator of the turbine was designed...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. August 2007, 129(8): 1015–1029.
Published Online: March 15, 2007
... description of the flow across the turbomachine. Using hot-wire anemometry, measurements of axial and tangential velocities were carried out in two transversal sectors: one between the rows and the other downstream of the rotor, covering the whole span of the stage for a complete stator pitch. Ensemble...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. November 2006, 128(6): 1289–1294.
Published Online: May 2, 2006
...David Megias-Alguacil; Erich J. Windhab The objective of this work is to experimentally study the deformation behavior and breakup process suffered by a droplet submitted to the complex flow developed in a model multitoothed rotor-stator. The studied systems consist of an aqueous solution...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 743–751.
Published Online: April 1, 2005
... are smaller compared with other combinations of vane numbers. However, the pressure fluctuations are found to be greater than other cases. 20 08 2003 26 03 2005 01 04 2005 flow instability rotors stators diffusion pumps blades impellers computational fluid dynamics vortices...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. July 2005, 127(4): 787–794.
Published Online: March 30, 2005
...Sébastien Poncet; Roland Schiestel; Marie-Pierre Chauve The present work considers the turbulent flow inside an annular rotor-stator cavity with and without centrifugal throughflow. Extensive measurements performed using a two-component laser-Doppler anemometer technique, and pressure transducers...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. May 2005, 127(3): 495–502.
Published Online: March 7, 2005
... at the rotor–stator interface. This zone is the seat of strong interactions between the moving part and the fixed part. This phenomenon has as consequences: Strongly unsteady flow, fluctuating forces on the stator blades, and an efficiency decrease. This work is part of a project which main objective...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. September 2002, 124(3): 791–797.
Published Online: August 19, 2002
... 2002 pumps flow measurement rotors stators velocity measurement performance evaluation Blade to blade evolutions of C u ¯ / U 2 , nondimensional mean absolute velocity peripheral components, are shown for a particular radius inside the impeller R...
Journal Articles
Article Type: Additional Technical Papers
J. Fluids Eng. June 2002, 124(2): 400–412.
Published Online: May 28, 2002
...Jerzy Swirydczuk The behavior of turbine stator wakes moving with the flow through a rotor cascade is studied. The stator wake is modeled as a series of active vortices forming part of a von Karman vortex street, the motion of which is determined with the aid of the vortex dynamics theory...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. June 2002, 124(2): 550–554.
Published Online: May 28, 2002
... incorporates important rotor-stator interactions that are neglected in models based on a swept-wake approximation. The model is tested successfully by computing the deterministic stresses in the stator vane passage of a centrifugal pump, and comparing them with direct measurements using PIV data. Remaining...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. December 2001, 123(4): 737–747.
Published Online: June 29, 2001
... to improve the unsteady pressure evaluation by a boundary integration method in the rotor-stator interaction problem. Moreover, for a more realistic prediction of the pressure fluctuations, the inlet flow was supposed to change with time so that pumping system may balance. The calculated time-varying flow...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. December 2001, 123(4): 787–792.
Published Online: June 6, 2001
... rotors stators pumps compressors aeroacoustics pressure fluctuations The unsteadiness of the internal flows is at the origin of certain physical phenomena observed in the turbomachines such as aerodynamic noise, unsteady cavitation, and pressure fluctuations. A significant share...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. December 2001, 123(4): 780–786.
Published Online: June 6, 2001
...F. Bakir; S. Kouidri; T. Belamri; R. Rey An algorithm using the singularity method was developed. It allows taking into account the interaction between fixed and mobile cascades. Its principle is based on the summation of discrete vortices distributed periodically on the rotor and stator profiles...