...Pierre Duquesne; Jerome Dombard; Nicolas Poujol; Alexis Giauque Large eddy simulations (LES) results are used to track flow separation zones in a splittered vaned radial diffuser near the compressor best efficiency at high rotation speed. The topology analysis reveals some closed separations...

...@stu.hit.edu.cn 09 08 2022 16 12 2022 19 12 2022 30 01 2023 tip leakage flow aerodynamic performance turbine cascade sweeping jet actuator flow separation cavity and leaking flows fluid dynamics and heat transfer phenomena in compressor and turbine components of gas turbine...

...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...

... separation from the ceiling as laminar flow separation is induced on the surface of the test-plate. The absence of flow separation on the ceiling surface was confirmed through flow visualization using tufts. The side view of the test-section is shown schematically in Fig. 1 . Thus far, studies...

... 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...

... 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 Control Using Pulsed Jets ,” ASME J. Turbomach. 0889-504X...

...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...

... 2010 27 04 2010 bars blades 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...

... is ( p t , in − p t ) / ( p t − p ) . Both airfoils show almost the same profile and magnitude of the pressure loss at the two sections. With the lightweight airfoil, the flow separates on the pressure surface, but reattaches; therefore, the additional loss increase...

... 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...

... computational fluid dynamics fans flow instability flow separation transonic flow vortices wakes As part of an ongoing effort to increase stage loading and efficiency, the Air Force Research Laboratory (AFRL), Compressor Aero Research Laboratory (CARL), has been conducting experimental...

..., with a small initial deceleration followed by a large acceleration and then a small deceleration. aerospace engines compressors flow separation geometry optimisation pipe flow 01 09 2008 17 12 2008 17 09 2009 A area C p static pressure...

... was estimated with the boundary layer code TEXSTAN ( 38 ). The code was used to compute the laminar suction side boundary layer from the leading edge to the separation point using the pressure gradient from Fig. 4 as input for each case. The code stops when the flow separates, and the separation points...

.... 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...

... 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...