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Keywords: flow separation
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2024, 146(10): 101011.
Paper No: TURBO-23-1307
Published Online: May 8, 2024
...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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. June 2023, 145(6): 061015.
Paper No: TURBO-22-1232
Published Online: January 30, 2023
... e t = total pressure loss with jet BZ = buffer zone FCZ = flow control zone HSJA = hole-style steady jet actuator LFSL = leakage flow separation line LFZ = leakage flow zone MP = measurement point ORI = original scheme (without injection) PFSL...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. June 2023, 145(6): 061001.
Paper No: TURBO-22-1276
Published Online: December 6, 2022
...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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031019.
Published Online: July 15, 2011
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031009.
Published Online: July 14, 2011
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021017.
Published Online: June 29, 2011
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011023.
Published Online: June 1, 2011
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011020.
Published Online: May 31, 2011
... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041021.
Published Online: April 25, 2011
... boundary layers bubbles flow control flow separation flow simulation jets turbines vortices Boundary layer separation can lead to partial loss of lift and higher aerodynamic losses on low-pressure turbine (LPT) airfoils (e.g., Refs. 1 2 3 ). As designers impose higher loading to improve...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041016.
Published Online: April 21, 2011
...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...
Journal Articles
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2010, 132(4): 041006.
Published Online: April 27, 2010
... layer turbulence bubbles diffusion flow separation laser Doppler anemometry plates (structures) turbines wakes 14 07 2008 26 03 2009 27 04 2010 27 04 2010 The measured velocity distributions for all eight designs are shown in Fig. 3 . In each case, the flow...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031003.
Published Online: March 24, 2010
... bubbles cooling flow separation flow simulation lightweight structures liquid films Navier-Stokes equations pipe flow turbines Nowadays, in the aero-engine industry, there is an increasing demand for even higher performance and drastic reduction in engine weight while meeting the safety...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021004.
Published Online: January 11, 2010
... 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...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2010, 132(1): 011011.
Published Online: September 17, 2009
... is that it can be used to safely increase the size of the design space in which aeroengine duct designers can operate. 01 09 2008 17 12 2008 17 09 2009 aerospace engines compressors flow separation geometry optimisation pipe flow In aeroengines, an S-shaped annular duct...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2010, 132(1): 011007.
Published Online: September 16, 2009
... bubbles flow measurement flow separation turbines wind tunnels Boundary layer separation can lead to partial loss of lift and higher aerodynamic losses on low-pressure turbine (LPT) airfoils (e.g., Refs. 1 2 3 ). As designers impose higher loading to improve efficiency and lower cost...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2010, 132(1): 011004.
Published Online: September 11, 2009
.... 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2009, 131(4): 041013.
Published Online: July 6, 2009
... 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...