... thermodynamic loss increase of about 0.7% at low coolant injection rates. Increasing the blowing rates, the additional loss vanishes. 20 09 2010 17 10 2010 20 07 2011 20 07 2011 blades coolants cooling film flow nozzles pressure thermodynamics turbulence In advanced...

... over the pulsing duration is very small, suggesting a large thermal inertia that keeps the wall surface largely unaffected by the time scale of the pulsations; this holds true for both blowing ratios tested. 02 08 2010 10 08 2010 19 07 2011 19 07 2011 cooling film flow...

...., see Ref. 4 ). Such studies have primarily concerned themselves with surface heat transfer information rather than the flow structure per se for different geometries and flow conditions. blades design engineering film flow flow measurement heat transfer infrared imaging turbines...

... of the vane. 02 10 2009 18 01 2010 29 11 2010 29 11 2010 cooling film flow heat measurement turbines In order to increase both thermal efficiency and power output, modern day gas turbines are manufactured to operate at temperatures that exceed the melting point...

... the cooling system so that the turbine components are sufficiently cooled while the use of compressor air is minimized to achieve optimum cycle efficiencies. deposition roughness film cooling blades cooling film flow turbines turbulence 27 07 2009 21 08 2009 11 11 2010...

.... , Dewitt , D. P. , Bergman , T. L. , and Lavine , A. S. , 2007 , Fundamentals of Heat and Mass Transfer , 6th ed. , Wiley , New York , p. 434 . 23 12 2008 26 01 2009 09 09 2010 09 09 2010 ash blades coolants erosion film flow flow simulation...

... of the standard tip, and all modifications contributed significantly to the area affected by the hot tip leakage flow and the total heat flux. 19 06 2008 22 02 2009 20 01 2010 20 01 2010 blades film flow flow simulation gas turbines heat transfer rotors turbulence...

... anemometry cooling film flow jets plates (structures) temperature measurement thermocouples turbines velocity measurement wakes wheels Film cooling has been studied extensively for over four decades, but most investigations have focused on flows with steady inflow conditions. The flow...

... configuration and present the first test results under machine operating conditions. 28 07 2006 08 08 2006 jets film flow gas turbines cooling aerodynamics vortices film cooling film-cooling effectiveness double-jet kidney vortices Due to high turbine inlet temperatures...

... the exact physical mechanisms are still being defined, there are very clear advantages to the use of pulsed flows and their associated starting vortices for control of wall flows, turbine film cooling flows, and many other flows. The possibility of reducing the duty cycle and actual film flow rate...

... Dimensionless velocity profile, U jet ∕ U ∞ , at exit plane of center hole with B = 0.5 Temperature, θ , for B = 0.5 at x ∕ D = 7 19 12 2005 16 01 2006 film flow cooling flow measurement anemometry jets Film cooling...

... were also decreased significantly. Relative to a film cooled smooth surface, a film cooled rough surface was found to increase the heat flux to the surface by 30%–70%. 01 10 2004 01 02 2005 film flow cooling turbines blades surface roughness aerodynamics turbulence...

... boundary layer turbulence cooling film flow Mach number supersonic flow gas turbines heat transfer Todays gas turbines are heading towards higher pressure ratios and higher turbine inlet temperatures to increase cycle efficiency, and primarily in aeroengine applications towards less turbine...

... nozzles turbulent diffusion temperature distribution gas turbines film flow cooling boundary layer turbulence Nonuniform temperature profiles, or “hot streaks” exiting the combustor in a gas turbine engine play a large role in failures of the first stage nozzle guide vanes and rotor blades...

..., The Netherlands, June 3–6, 2002. Manuscript received by the IGTI October 10, 2001. Paper No. 2002-GT-30520. Review Chair: E. Benvenuti. 03 June 2002 10 October 2001 23 04 2003 turbines aerodynamics cooling film flow flow simulation stagnation flow Navier-Stokes equations...

... 2001 23 01 2003 gas turbines cooling heat transfer turbulence film flow infrared detectors temperature measurement In modern gas turbines sophisticated cooling schemes including film cooling are widely used to protect the vanes and blades of the first turbine stages from...

... velocity fields at the downstream location due to showerhead injection. Measurement of these thermal and velocity fields gives insight into how the showerhead blowing affects downstream film cooling performance. gas turbines heat transfer cooling film flow flow visualisation velocity...

... 2002 29 November 2001 07 11 2002 gas turbines cooling heat transfer film flow temperature measurement flow measurement turbulence jets The typical design process of advanced turbine components relies on thermal and structural finite element analyses. A reliable...

...–6, 2002. Manuscript received by the IGTI, November 2, 2001. Paper No. 2002-GT-30175. Review Chair: E. Benvenuti. 03 June 2002 02 November 2001 07 11 2002 gas turbines heat transfer film flow flow visualisation laser Doppler anemometry turbulence jets cooling...

... gas turbines cooling heat transfer film flow flow measurement jets temperature measurement The lateral mean heat transfer coefficients on a film-cooled wall are the essential entity for the prediction of the wall heat flux and, subsequently, the blade material temperature. To enable heat...