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Keywords: turbulence
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2024, 146(1): 011005.
Paper No: TURBO-23-1168
Published Online: October 25, 2023
... the 1.5-stage turbine by performing computational fluid dynamics simulations with the simcenter star-ccm + software. The mathematical model of the simulations consisted of the ensemble-averaged unsteady-state mass, momentum, and energy equations complemented by the SST turbulence model. The authors...
Journal Articles
Journal Articles
Journal Articles
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
Article Type: Research-Article
J. Turbomach. March 2013, 135(2): 021040.
Paper No: TURBO-11-1230
Published Online: November 19, 2012
... = heat transfer analog NGV = nozzle guide vane Tu = turbulence PS, SS = pressure side, suction side LE, TE = leading edge, trailing edge MUSCL = monoton upstream-centered scheme for conservation laws n1 = instrumented vane 1 n2 = instrumented vane 2 C1...
Journal Articles
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041004.
Published Online: July 19, 2011
... holes partially impinges onto the endwall. 02 07 2010 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...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031022.
Published Online: July 15, 2011
...) flow visualization taken from Ref. 23 is shown in Fig. 7 . The simulations were performed with an incompressible solver and the k − ω -SST turbulence model (where SST stands for shear stress transport) using FLUENT -v6.3. The jets of row A1 impinge on wall D where the resulting high...
Journal Articles
Publisher: ASME
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
Publisher: ASME
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
Publisher: ASME
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
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
Journal Articles
Publisher: ASME
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...