... on a Turbine Vane ,” ASME J. Turbomach. , 141 ( 3 ), p. 031007 . 10.1115/1.4042070 [23] Koklu , M. , and Owens , L. R. , 2017 , “ Comparison of Sweeping Jet Actuators With Different Flow-Control Techniques for Flow-Separation Control ,” AIAA J. , 55 ( 3 ), pp. 848 – 860 . 10.2514/1...

...Hunter D. Nowak; Federico Lluesma-Rodriguez; Iman Rahbari; John P. Clark; Guillermo Paniagua A new class of power generation devices that experiences increased losses due to bulk flow separation in segments of their expected in-flight regime is emerging. As such, active flow control becomes...

... 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...

... blade profile. 22 08 2008 26 06 2009 14 07 2011 14 07 2011 blades bubbles flow control flow instability flow separation gas turbines jets wakes With the trend toward higher bypass ratios in turbofans, demands are increasing for the low pressure turbines (LPTs...

... profile has a strong effect on the position of flow separation, whereby a hub-strong profile tends to separate at the casing and the tip-strong profile on the hub. Steady computational fluid dynamics (CFD) simulations using the shear stress transport (SST) turbulence model have been carried out based...

... geometries where the boundary layers are not able to withstand the strong adverse pressure gradient, which results in flow separation. This paper describes the flow through a fully separated duct as a baseline configuration. In a next step the influence of passive flow control devices onto this separation...

... the aerodynamic blade loading. For transonic profiles, this leads to very high velocities on the suction side and shock induced separation is likely to occur. The total pressure loss increase due to flow separation and strong shocks, as well as the underturning of the flow, limits the increase of the blade pitch...

.... Johnston , J. P. , and Nishi , M. , 1990 , “ Vortex Generator Jets—Means for Flow Separation Control ,” AIAA J. 0001-1452 , 28 , pp. 989 – 994 . 10.2514/3.25155 Bons , J. P. , Sondergaard , R. , and Rivir , R. B. , 2002 , “ The Fluid Dynamics of LPT Blade Separation...

...Xinqian Zheng; Yangjun Zhang; Weidong Xing; Junyue Zhang Flow separation control was investigated on a compressor cascade using three types of fluidic-based excitations: steady suction, steady blowing, and synthetic jet. By solving unsteady Reynolds–averaged Navier–Stokes equations, the effect...

... 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...

...Reinaldo A. Gomes; Reinhard Niehuis Film cooling experiments were performed using a highly loaded high pressure turbine blade blade linear cascade. A large region with main flow separation is found on the pressure side and film cooling is provided into this area with three rows of either...

... boundary layer turbulence bubbles diffusion flow separation laser Doppler anemometry plates (structures) turbines wakes The flow inside turbomachinery turbine blade passages is inherently unsteady. Each blade row sheds turbulent wakes, which periodically convect through downstream passages...

... of the film coolant being bypassed from the pressure side to the suction side. General arrangement of the facility 14 07 2008 09 03 2009 24 03 2010 24 03 2010 aerospace components aerospace engines aerospace industry blades bubbles cooling flow separation flow...

... appears to capture all of the relevant physics for both engineered and service-related (e.g., wear or environmentally induced) roughness. Roughness influences engine performance by causing earlier boundary layer transition, increased boundary layer momentum loss (i.e., thickness), and/or flow separation...

.... aerospace engines compressors flow separation geometry optimisation pipe flow 01 09 2008 17 12 2008 17 09 2009 Area ruling has clearly had a beneficial effect on the strut-hub corner separation; the predicted net duct loss has decreased by 10%. Although the overall net duct...

... (28 versus 33), higher tip speed (414.53 m/s versus 341.37 m/s) resulting in an increased tip relative Mach number (1.389 versus 1.191), and the hub relative Mach number being supersonic (1.100 versus 0.963). bubbles computational fluid dynamics fans flow instability flow separation...

... using the pressure gradient from Fig. 4 as input for each case. The code stops when the flow separates, and the separation points computed were in good agreement with the pressure and velocity profiles presented above. Figure 21 shows the peak frequencies extracted from Figs. 10 12 14 16 18...

.... 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...

... 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...

... with unsteady calculations must be accepted in order to increase the understanding of the physical flow phenomena in turbine exit flow and its interaction with the downstream diffuser. 22 08 2008 16 10 2008 06 07 2009 flow separation turbines turbulence wakes It is well known...