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Keywords: turbulence
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Journal Articles
Article Type: Research Papers
J. Turbomach. December 2021, 143(12): 121005.
Paper No: TURBO-20-1253
Published Online: July 5, 2021
... the oil film thickness distribution and interface velocity at different engine operating conditions. Currently, Reynolds-averaged Navier–Stokes (RANS) CFD uses a semi-empirical method of turbulence damping, which is inaccurate for wavy films and so impacts the modeling of bearing chambers and gearboxes...
Journal Articles
Article Type: Research Papers
J. Turbomach. September 2021, 143(9): 091009.
Paper No: TURBO-20-1388
Published Online: May 11, 2021
...Huang Chen; Yuanchao Li; Subhra Shankha Koley; Joseph Katz Challenges in turbulence modeling in the tip region of turbomachines include anisotropy, inhomogeneity, and non-equilibrium conditions, resulting in poor correlations between Reynolds stresses and the corresponding mean strain-rate...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2021, 143(3): 031008.
Paper No: TURBO-20-1186
Published Online: March 1, 2021
... study focuses on the effect of resolution on flow physics and loss generation and uses a compressor cascade subjected to freestream turbulence. The results show that both resolving local entropy generation rate and capturing the inception and growth of instabilities are critical to accuracy of loss...
Journal Articles
Article Type: Research Papers
J. Turbomach. December 2020, 142(12): 121006.
Paper No: TURBO-19-1298
Published Online: November 9, 2020
... a single blade passage back into the inlet of the computational domain. As a result, a type of repeating-passage simulation is obtained such as observed by an embedded blade-row. We find that freestream turbulence levels rise significantly as the size of the rotor-stator axial gap is reduced...
Journal Articles
Article Type: Research-Article
J. Turbomach. March 2013, 135(2): 021040.
Paper No: TURBO-11-1230
Published Online: November 19, 2012
... turbulence Highly swirling flows are now widely employed in gas turbine combustors in order to improve the combustion aerodynamics. Swirl enhances the fuel-air mixing and thus reduces peak temperatures, which reduces NO x emissions. In addition, the recirculation zone that develops as a result...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041018.
Published Online: July 25, 2011
...Vladimir Vassiliev; Stefan Irmisch; Samer Abdel-Wahab; Andrey Granovskiy The flow in exhaust diffusers along with the channel geometry strongly depends on the inflow conditions, including Mach number level, total pressure distribution, flow angle, and turbulence. In the first part of this paper...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041022.
Published Online: July 25, 2011
... on the physics of flow and heat transfer in the rotor tip, casing, and hub regions. The simulation was performed using the unsteady Reynolds-averaged Navier–Stokes code MSU-TURBO . A low Reynolds number k- ε model was utilized to model turbulence. The rotor blade in question has a tip gap height of 2.1...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041014.
Published Online: July 21, 2011
... 2011 21 07 2011 blades cooling flow visualisation mass transfer rotors stators turbulence vortices The efficiency of a gas turbine increases with the temperature of the hot combustion gases at the stage inlet. Modern gas turbines are designed to operate at turbine inlet...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041009.
Published Online: July 20, 2011
... out at low speed ( M 2 is = 0.2 ) and low inlet turbulence intensity level, with coolant mass flow rate ratio varied within the 0.5–2.5% range. Pressure probe traverses were performed downstream of the vane trailing edge to show the secondary flow field modifications and to evaluate trench additional...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041006.
Published Online: July 20, 2011
... of deterministic roughness is investigated in these experiments, varying the height and eccentricity of the roughness elements, showing the combined influence of roughness height and anisotropy of the rough surfaces on laminar to turbulent transition and the turbulent boundary layer as well as boundary layer...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041004.
Published Online: July 19, 2011
... 03 08 2010 19 07 2011 19 07 2011 aerodynamics blades cooling Mach number turbines turbulence The aerothermal design of advanced high and low pressure turbine blades has progressed significantly in the past decade primarily due to the requirement of increased turbine...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031022.
Published Online: July 15, 2011
.../1.1791287 Andrews , G. , Hussain , R. A. , and Mkpadi , M. , 2003 , “ Enhanced Impingement Heat Transfer: Comparison of Co-Flow and Cross-Flow With Rib Turbulators ,” Proceedings of the International Gas Turbine Congress , Paper No. IGTC2003Tokyo TS-075. Annerfeldt , M...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031001.
Published Online: July 14, 2011
... levels of turbulence, which are typically found in sharp turns, in ribbed ducts, and, especially, in rotating ducts. In the past, a slip between motor and channel rotation causes additional non-negligible uncertainties during PIV measurements due to an unstable image position. These were caused...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031006.
Published Online: July 14, 2011
...Diganta P. Narzary; Kuo-Chun Liu; Akhilesh P. Rallabandi; Je-Chin Han Adiabatic film-cooling effectiveness is examined on a high-pressure turbine blade by varying three critical engine parameters, viz., coolant blowing ratio, coolant-to-mainstream density ratio, and freestream turbulence intensity...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031008.
Published Online: July 14, 2011
... RANS applying a k - ε - v 2 - f turbulence model and the Spalart and Allmaras turbulence model and detached-eddy simulation (DES) based on the Spalart and Allmaras turbulence model are addressed to solve thermal convection. The CFD calculations were conducted by simulating a semicircular model...
Journal Articles
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
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021013.
Published Online: June 27, 2011
...E. L. Erickson; F. E. Ames; J. P. Bons Heat transfer distributions are experimentally acquired and reported for a vane with both a smooth and a realistically rough surface. Surface heat transfer is investigated over a range of turbulence levels (low (0.7%), grid (8.5%), aerocombustor (13.5...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011021.
Published Online: June 1, 2011
... of the effect of the coupled vortices. The waist-shaped slot holes provide the surface with very good thermal protection, especially in the upstream region. Although the console holes with small a exit-entry area ratio provide better thermal protection than the waist-shaped slot holes due to small turbulence...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011011.
Published Online: May 26, 2011
...Ralph J. Volino Boundary layer separation has been studied on a very high lift, low pressure turbine airfoil in the presence of unsteady wakes. Experiments were done under low (0.6%) and high (4%) freestream turbulence conditions on a linear cascade in a low speed wind tunnel. Wakes were produced...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011004.
Published Online: May 24, 2011
.... The flow remains subsonic in the throat region for both Mach numbers. The corresponding freestream Reynolds numbers, based on the axial chord length and the exit velocity, are 1.3 × 10 6 and 1.74 × 10 6 , respectively. Freestream turbulence intensity level at the cascade inlet is 6%. The results show...