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Keywords: friction
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Journal Articles
Article Type: Technical Briefs
J. Turbomach. July 2012, 134(4): 044501.
Published Online: July 19, 2011
... slightly different from each other. As blisks lack the uncertainty and variability of friction properties related to joints, the maximum vibration response level of a blisk test piece in operation can be predicted prior to installation. A previously proposed response-level prediction procedure for mistuned...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041014.
Published Online: April 21, 2011
... the effect of manufacturing roughness levels on these small channels. Convective heat transfer coefficients and friction factors were deduced based on measured flow conditions and known boundary conditions. It was shown that at an average roughness height of 6.1 μ m , which corresponded to 2.2...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2011, 133(3): 031019.
Published Online: November 18, 2010
...Akhilesh P. Rallabandi; Nawaf Alkhamis; Je-Chin Han Experiments to determine heat transfer coefficients and friction factors are conducted on a stationary 45 deg parallel rib-roughened square channel, which simulates a turbine blade internal coolant passage. Copper plates fitted with silicone...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021022.
Published Online: October 26, 2010
... after the shaft breakage. The corresponding time-dependent high pressure turbine inlet conditions are used to calculate the turbine maximum speed, taking into account friction and blade and vane tip clearance variations as a result of the rearward movement of the turbine and destruction of the turbine...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021013.
Published Online: January 13, 2010
... on friction and heat transfer correlations for smooth and rib-roughened cooling channels. Special attention is given to the boundary conditions linking these solvers and to the stability of the complete CHT calculation procedure. The Larson–Miller parameter model is used to determine the creep-to-rupture...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2009, 131(2): 021012.
Published Online: January 29, 2009
...Giovanni Tanda; Roberto Abram, Ph.D. student Local and average Nusselt numbers and friction factors are presented for rectangular channels with an aspect ratio of 5 and angled rib turbulators inclined at 45 deg with parallel orientations on one and two surfaces of the channel. The convective fluid...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2008, 130(4): 041016.
Published Online: August 4, 2008
... acceleration between protrusions, while the turbulence generated in the wake has a secondary effect. Heat transfer augmentation ratios of 0.99 at Re H = 220 , 2.9 at Re H = 940 , and 2.5 at Re H = 9300 are obtained. Both skin friction and form losses contribute to pressure drop in the channel. Form losses...
Journal Articles
Journal Articles
Article Type: Technical Briefs
J. Turbomach. July 2008, 130(3): 034501.
Published Online: May 2, 2008
...Soo Whan Ahn; Ho Keun Kang; Sung Taek Bae; Dae Hee Lee An experimental study was carried out to investigate the heat transfer and friction characteristics of a fully developed turbulent air flow in a square channel with 45 deg inclined ribs on one, two, or four walls. Either two opposite walls...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2008, 130(2): 021012.
Published Online: March 21, 2008
...J. R. Beisheim; G. B. Sinclair The stress analysis of dovetail attachments presents some challenges. These stem from the high stress gradients present, the contact inequalities attending conforming contact, and the nonlinearities inherent in Coulomb friction laws. Obtaining converged contact...
Journal Articles
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2008, 130(1): 011002.
Published Online: December 14, 2007
...J. Szwedowicz; R. Visser; W. Sextro; P. A. Masserey Numerical predictions of the forced vibration of a disk assembly including frictional effects between the shrouds are presented concerning engineering needs for the blade design process. Assuming a tuned disk assembly, numerical static, free...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2007, 129(4): 750–755.
Published Online: August 18, 2006
... to be as great as 50 and this leads to laminar boundary layer shape factors as low as 1.3 and skin friction coefficients up to 12 times the value for a flat plate laminar boundary layer. Boundary layers therefore grow much more rapidly on concave surfaces than on flat plates. The transition model assumed...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2007, 129(3): 495–502.
Published Online: July 25, 2006
... as function of such contact interface parameters as gap and interference values, friction and contact stiffness coefficients, and normal stresses. High accuracy and efficiency of the new method have been demonstrated on numerical examples including a large-scale nonlinear bladed disk model and major types...
Journal Articles
Article Type: Technical Papers
J. Turbomach. January 2007, 129(1): 143–150.
Published Online: February 1, 2006
... of the new models and an analysis of the influence of the damper parameters on the forced response of bladed disks is made. 01 10 2005 01 02 2006 blades discs (structures) friction vibration control mechanical contact finite element analysis Due to the high density of natural...
Journal Articles
Article Type: Technical Papers
J. Turbomach. April 2006, 128(2): 403–410.
Published Online: September 28, 2005
...E. P. Petrov; D. J. Ewins An approach is developed to analyze the multiharmonic forced response of large-scale finite element models of bladed disks taking account of the nonlinear forces acting at the contact interfaces of blade roots. Area contact interaction is modeled by area friction contact...
Journal Articles
Article Type: Technical Papers
J. Turbomach. July 2005, 127(3): 545–551.
Published Online: July 1, 2005
... confirmed that is believed to be responsible for the smaller spreading angle of spots measured at the wall. This finding is expected to have important implications to the development of improved transition models that are used to predict heat transfer and skin friction for turbine blades. laminar flow...
Journal Articles