... effects on more complex geometries. 13 08 2009 16 10 2009 15 11 2010 15 11 2010 blades boundary layers computational fluid dynamics flow separation flow simulation geometry laminar to turbulent transitions turbines turbulence The flowfield found in low pressure...

...Alan D. Henderson; Gregory J. Walker Laminar-turbulent transition behavior is studied near the leading edge of an outlet stator blade in a low-speed 1.5-stage axial-flow research compressor. The stator is a typical controlled diffusion design with a circular arc leading edge profile. Slow-response...

... to be understood thoroughly and new opportunities exploited where this is feasible.a 08 06 2007 28 06 2007 22 01 2009 aerospace engines blades bubbles compressors confined flow flow separation gas turbines heat transfer jets laminar to turbulent transitions plates (structures...

...Alan D. Henderson; Gregory J. Walker; Jeremy D. Hughes Wake-induced laminar-turbulent transition is studied at the leading edge of a C4-section compressor stator blade in a 1.5-stage axial compressor. Surface hot-film sensor observations are interpreted with the aid of numerical solutions from...

.... The set of gauzes and honeycomb inserts in the tunnel made the flow uniform before delivering it into the cascade test section through the inlet duct (7). boundary layer turbulence laminar to turbulent transitions gas turbines blades laser Doppler anemometry pressure measurement wakes bubbles...

... , “ The Role of Laminar-Turbulent Transition in Gas Turbine Engine ,” ASME J. Turbomach. 0889-504X , 113 , pp. 509 – 537 . Roberts , S. K. , and Yaras , M. I. , 2003 , “ Effects of Periodic Unsteadiness, Free-Stream Turbulence and Flow Reynolds Number on Separation-Bubble Transition...

... 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...

... compressors boundary layer turbulence laminar to turbulent transitions flow visualisation computational fluid dynamics wakes blades Figure 12 shows the PIV measurements of the ensemble-averaged flow-field at three rotor-phases close to the peak-suction position on the blade. The figure plots...

... turbine guide vane cascade for different operating conditions. 17 07 2006 27 07 2006 transonic flow turbines blades laminar to turbulent transitions boundary layer turbulence heat transfer In turbomachines and especially in aircraft engines the Reynolds numbers...

... stresses components of Eq. 1 while only the viscous contribution of the laminar conditioned data is calculated. 24 07 2006 25 07 2006 laminar to turbulent transitions boundary layers entropy turbines The increases in turbomachinery efficiency over the years have come...

... turbulence turbines blades laminar to turbulent transitions 15 11 2005 14 07 2006 Turbulence-energy budgets (Eq. 3 ) for the S fs test case Turbulence-energy budgets (Eq. 3 ) for the S u u simulation at three streamwise locations As noted...

... to have the capability of accurately predicting transitional flows under a wide range of low-pressure turbine conditions. 14 02 2004 13 02 2006 computational fluid dynamics laminar to turbulent transitions turbines blades The process of transition from laminar to turbulent...

... laminar to turbulent transitions boundary layer turbulence flow measurement heat transfer friction It has been well known that boundary layer transition from laminar to turbulent flows starts by the random formation of localized turbulent regions known as “turbulent spots.” These turbulent...

... to turbulent transitions The unsteady flow field in low-pressure (LP) turbines is governed by a combination of potential and convective interactions 1 . Of these, the convected wakes from upstream blade rows play the most significant role due to their effect on the blade...

...P. M. Byvaltsev, Researcher,; K. Kawaike, Chief Researcher, A comparative study of two transition zone models was carried out to assess their ability to simulate boundary layer laminar-turbulent transition. Transition modeling is based on the use of an algebraic equation for the intermittency...

... quantifying their combined effect on heat transfer and laminar-turbulent transition. In complementary studies a trip wire is used on the suction side in order to fix the transition location close to the stagnation point, thereby allowing a deeper insight into the effect of roughness on the turbulent boundary...

... flows bubbles rotational flow laminar to turbulent transitions flow instability wakes boundary layers flow separation wind tunnels The aerodynamic performance of turbomachinery blades operating at Reynolds numbers of less than one million is dependent on the transition modes occurring...

... Mar 2003 09 02 2005 compressors external flows flow simulation computational fluid dynamics wakes boundary layers laminar to turbulent transitions aerodynamics Boundary layer transition plays an important role in compressor aerodynamic performance. The location and type...

...Xue Feng Zhang; Maria Vera; Howard Hodson; Neil Harvey An experimental study was conducted to improve the performance of an aft-loaded ultra-high-lift low-pressure turbine blade known as U2 at low Reynolds numbers. This was achieved by manipulation of the laminar-turbulent transition process...

... patch increased by nearly 2.5 times the smooth plate value. Finally, the rough patch caused the Reynolds shear stresses to increase in the region close the plate surface. 01 10 2004 01 02 2005 turbines blades boundary layer turbulence rough surfaces laminar to turbulent transitions...