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Keywords: stators
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Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041019.
Published Online: July 25, 2011
...C. Aalburg; A. Simpson; M. B. Schmitz; V. Michelassi; S. Evangelisti; E. Belardini; V. Ballarini Two stators of a multistage centrifugal compressor with progressively smaller outer radii have been designed, built, and tested. The aim was to achieve a significant reduction in the outer diameter...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041017.
Published Online: July 21, 2011
...Nicolas Binder; Sebastien Le Guyader; Xavier Carbonneau The influence of variable geometry stators on the stage behavior is analyzed from both theoretical and experimental points of view. A theoretical analysis of the trajectory of some pressure-ratio lines in a loading-to-flow-coefficient diagram...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041014.
Published Online: July 21, 2011
... 2011 21 07 2011 blades cooling flow visualisation mass transfer rotors stators turbulence vortices The efficiency of a gas turbine increases with the temperature of the hot combustion gases at the stage inlet. Modern gas turbines are designed to operate at turbine inlet...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031021.
Published Online: July 15, 2011
... embedded stage was considered, and an optimization of stator lean and rotor twist was carried out by applying suitable repeating inlet/outlet boundary conditions. In the second step, a proper geometrical transformation between the original reference stage and the optimized one was identified...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021008.
Published Online: June 23, 2011
... pressure from which the time-resolved entropy field can be derived. The measurements of the time-resolved entropy provide a new insight into the unsteady loss mechanisms that are associated with the unsteady interaction between rotor and stator blade rows. A particular attention is paid to the interaction...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021010.
Published Online: June 23, 2011
...Daniel Nerger; Horst Saathoff; Rolf Radespiel; Volker Gümmer; Carsten Clemen The following paper describes an experimental investigation of a highly loaded stator cascade with a pitch to chord ratio of t / l = 0.6 . Experiments without as well as with active flow control by means of endwall...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021009.
Published Online: June 23, 2011
...R. Srivastava; J. Panovsky; R. Kielb; L. Virgin; K. Ekici A new mechanism for fan stator vane failure in turbofan engines at high speed and high loading has been identified and reported in this paper. Highly destructive vane failures have been encountered at Honeywell in a development fan...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011001.
Published Online: May 24, 2011
... hand, the simulation time is drastically reduced. The harmonic analysis of the wall pressure on the stator blade is performed, and the L 2 -norm of the difference with the U-RANS computation is shown in Fig. 14 . The five-instant HB computation captures the first harmonic with a difference...
Journal Articles
G. M. Laskowski, R. S. Bunker, J. C. Bailey, G. Ledezma, S. Kapetanovic, G. M. Itzel, M. A. Sullivan, T. R. Farrell
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041020.
Published Online: April 25, 2011
... by rotating the cylinders and disk at rotational rate that scales with a typical engine. A sliding mesh interface is utilized to communicate data between the stator and rotor domains. The stationary cases tend to ingest past the first angel-wing for a nominal coolant flow condition, whereas the effect...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041017.
Published Online: April 25, 2011
..., knowledge about the frequency content of the unsteady force vector and the related amplitudes is vital to the design process of partial admission turbine blades. The pressure plots showed that the nonuniformity in the static pressure field decreases considerably downstream of the second stage’s stator row...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031028.
Published Online: February 28, 2011
...Narmin Baagherzadeh Hushmandi; Torsten H. Fransson In this paper, the effects of axial gap distance between the first stage stator and rotor blades and multiblocking on aerodynamics and performance of partial admission turbines are analyzed numerically. The selected test case is a two stage axial...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031030.
Published Online: February 28, 2011
... for the investigation is a turbine stage of three-dimensional design from the QinetiQ turbine facility known as MT1. This stage is a high pressure transonic stage that has an unshrouded rotor, configured, and uncooled with 32 stators and 60 rotor blades. Two different CFD solvers are compared that use different...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031023.
Published Online: December 7, 2010
...D. W. Zhou; R. P. Roy; C.-Z. Wang; J. A. Glahn Experiments were carried out in a model air turbine stage to study the influence of rotor-stator rim cavity configuration on the ingestion of mainstream gas into the cavity. The three rim cavity configurations differed in their aspect ratio (height...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031007.
Published Online: November 12, 2010
... been used to validate a computational fluid dynamics (CFD) code. The calibrated CFD has then been used to show that, as the stage loading is increased, the flow in the stator passages breaks down first. This happens via a large corner separation, which significantly impairs the stage efficiency...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021020.
Published Online: October 25, 2010
... approach does not enable a correct modeling of the turbulent flow within a wheel space cavity, the authors tried to create an accurate model, taking into account the effects of inner and outer flow extraction, rotor and stator drag, leakages, injection momentum, and finally, the shroud/rim seal effects...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021016.
Published Online: October 22, 2010
... of turbojet engine. This is followed by a description of his 1984 ASME paper, in which more general formulae were derived for the blade excitation frequencies caused by the reflections of pressure pulses between the rotor blades, and both upstream and downstream stator vanes. These equations were subsequently...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021013.
Published Online: October 22, 2010
... of interest is the generalized force, which gives a direct indication of the mode excitability. In order to capture both up- and downstream excitation effects, the mode excitability has been assessed on both rotor and stator blades. The results show that the first harmonic excitation can be predicted well...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021008.
Published Online: October 21, 2010
... in order to point out the role of cooling air injection position, swirl number, and jet penetration on the cavities’ sealing performance. Steady state calculations were performed using two different computational domains: the first consists of a sector model of the whole turbine including the second stator...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021011.
Published Online: October 21, 2010
... between the stator and the rotor disk. This rim seal purge flow has a strong influence on the development of the hub secondary flow structures. This paper presents time-resolved experimental and computational data for a one-and-1/2-stage high work axial turbine, showing the influence of purge flow...
Journal Articles
Journal:
Journal of Turbomachinery
Publisher: ASME
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...
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