... 2011 15 07 2011 blades boundary layer turbulence bubbles flow instability flow separation laminar flow plates (structures) Although modern gas-turbine engines are highly developed, small improvements in performance can still yield significant economic benefits. Since...

... combustion equipment laminar flow thermal conductivity turbulence Coal is the world’s most abundant fossil fuel and is expected to continue to play a major role in electrical energy production in the future. One environmentally sound method to use coal is in an integrated gasification combined...

... values Tu = 5 % and Tu = 7 % were computed, but only results for the latter are included here. The level of agreement for the lower value is comparable. The flow geometry and mesh are shown in Fig. 1a . The pressure gradient imposed by the upper contoured wall leads to laminar-flow...

.... The presence of separation can adversely affect the performance of such airfoils, for which reattachment due to laminar-to-turbulent transition plays an important role. boundary layers bubbles flow instability flow separation laminar flow turbulence vortices 12 06 2007 03 08 2007...

... the developed analysis, heat transfer calculations are presented for the second stage vane of a high pressure turbine at hypothetical engine conditions. 12 09 2008 28 10 2008 13 07 2009 aerodynamics blades engines gas turbines heat transfer laminar flow statistical analysis surface...

... 2008 06 07 2009 aerodynamics aerospace components blades boundary layer turbulence bubbles compressors computational fluid dynamics flow measurement flow separation laminar flow pressure measurement stators wakes 2007 IGTI Best Technical Paper The leading-edge...

... acknowledged. As only the roughness models without the transition model are validated in this section, the model names do not include the affix “-T” (see Ref. 1 ). 20 06 2008 05 08 2008 20 04 2009 aerodynamics blades boundary layer turbulence heat transfer laminar flow...

... that of a laminar flow or early stages of transition and then develops into a more turbulent flow (e). The solid lines in the figure represent the SL of the horseshoe vortex and the PL of the horseshoe vortex based on the flow visualization results presented above. The evolution of the flow is studied along...

.... The optimum relative phase angle of the upstream wake and the downstream potential field can produce 0.25% of efficiency improvement through the reduction of the suction surface boundary layer loss. This reduction is mainly related to the calmed region and the laminar flow benefits that can be more...

... laminar flow pressure measurement stagnation flow thermal resistance In a gas turbine, the leading edge of a turbine vane or blade withstands the highest gas path pressures and temperatures of any part of the airfoil surface. Detailed knowledge of the aerodynamics and heat transfer sustained...

... is the following set of rough-wall boundary layer equations as derived by Taylor et al. ( 27 ) and Tarada ( 29 ): 27 06 2006 02 07 2006 12 02 2008 boundary layer turbulence laminar flow heat transfer turbines aerodynamics surface roughness Several recent experimental studies...

... observations. The current work therefore provides a basis for the modeling of transition on concave surfaces. 13 07 2006 18 08 2006 plates (structures) vortices boundary layers laminar flow blades friction laminar to turbulent transitions gas turbines Traditional transition...

... 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...

... . Manuscript received by the Turbomachinery Division, October 15, 2003; revised manuscript received, November 9, 2003. Editor: D. Wisler. 15 October 2003 09 November 2003 09 02 2005 heat transfer boundary layer turbulence laminar flow laminar to turbulent transitions...

... Turbine and Aeroengine Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI Dec. 2002; final revision Mar. 2003. Paper No. 2003-GT-38972. Review Chair: H. R. Simmons. 16 June 2003 01 Dec 2002 01 Mar 2003 09 02 2005 laminar flow external...

... transfer data. The quality of the predictive comparison was substantially affected by the turbulence model and near-wall methodology. 01 10 2004 01 02 2005 turbulence heat transfer cooling laminar flow boundary layers flow separation flow instability friction anemometry...

..., the heat transfer on the turbine rotor changes significantly due to the flow acceleration/deceleration and the incoming flow angle variation. 01 10 2004 01 02 2005 mass transfer heat transfer turbines blades wind tunnels laminar flow flow separation bubbles turbulence design...

... Turbomachinery Conference, Prague. 16 June 2003 01 December 2002 01 March 2003 29 12 2004 turbines convection wakes bubbles boundary layers shear turbulence laminar flow flow instability Historically, turbomachinery blading has been designed using a combination...

... Congress and Exhibition, Atlanta, GA, June 16–19, 2003. Manuscript received by the IGTI Dec. 2002; final revision Mar. 2003. Paper No. 2003-GT-38303. Review Chair: H. R. Simmons. 16 June 2003 01 Dec 2002 01 Mar 2003 29 12 2004 wakes flow separation bubbles laminar flow...

... Cross Section ,” ASME J. Heat Transfer , 102 , pp. 285 – 291 . Chilukuri , R. , and Humphrey , J. A. C. , 1981 , “ Numerical Computation of Buoyancy Induced Recirculation in Curved Square Duct Laminar Flow ,” Int. J. Heat Mass Transfer , 24 , pp. 305 – 314 . Komiyama , Y...