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Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041019.
Published Online: July 25, 2011
... the baseline design. The results indicate that the reduction in size was feasible without compromising the efficiency and operation range of the stage. 18 10 2010 24 01 2011 25 07 2011 25 07 2011 blades compressors computational fluid dynamics design of experiments...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041020.
Published Online: July 25, 2011
... film hole spacing, hole size, and TBC on surface heat transfer. Calculated capture efficiencies compare well with experimental results. 21 10 2010 03 12 2010 25 07 2011 25 07 2011 blades boundary layer turbulence coating techniques computational fluid dynamics cooling...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041022.
Published Online: July 25, 2011
...Vikram Shyam; Ali Ameri; Jen-Ping Chen In a previous study, vane-rotor shock interactions and heat transfer on the rotor blade of a highly loaded transonic turbine stage were simulated. The geometry consists of a high pressure turbine vane and a downstream rotor blade. This study focuses on the...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041014.
Published Online: July 21, 2011
...M. Papa; V. Srinivasan; R. J. Goldstein Mass transfer measurements on the endwall and blade suction surfaces are performed in a five-blade linear cascade with a high-performance rotor blade profile. The effects of purge flow from the wheelspace cavity entering the hot gas path are simulated by...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041012.
Published Online: July 21, 2011
... ( Shibata et al., “Performance Improvement of a Centrifugal Compressor Stage by Increasing Degree of Reaction Optimizing Blade Loading of a 3D-Impeller,” ASME Paper No. GT2009-59588 ). In spite of such a high relative velocity diffusion ratio, the same surge margin as with a conventional design was able to...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041016.
Published Online: July 21, 2011
...Filippo Coletti; Manfredi Scialanga; Tony Arts The present contribution is devoted to the experimental study of the conjugate heat transfer in a turbine blade cooling cavity located near the trailing edge. The cooling scheme is characterized by a trapezoidal cross-section, one rib-roughened wall...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041007.
Published Online: July 20, 2011
...M. Lorenz; A. Schulz; H.-J. Bauer The present experimental study is part of a comprehensive analysis accounting for heat transfer and aerodynamic losses on a highly loaded low pressure turbine blade with varying surface roughness. Whereas Part I focuses on heat transfer measurements at airfoil...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041009.
Published Online: July 20, 2011
... thermodynamic loss increase of about 0.7% at low coolant injection rates. Increasing the blowing rates, the additional loss vanishes. 20 09 2010 17 10 2010 20 07 2011 20 07 2011 blades coolants cooling film flow nozzles pressure thermodynamics turbulence In advanced...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041001.
Published Online: July 19, 2011
...Yasharth Bhartiya; Alok Sinha An algorithm to generate a reduced order model of a multistage rotor in which each stage has a different number of blades has been developed. It is shown that a reduced order model can be developed on the basis of tuned modes of certain bladed disks which can be easily...
Journal Articles
Article Type: Technical Briefs
J. Turbomach. July 2012, 134(4): 044501.
Published Online: July 19, 2011
...Y.-J. Chan; D. J. Ewins Integral bladed disks (also known as blisks) are more widely used in modern aeroengine compressor designs because of the potential weight savings, but there are challenges in controlling the extreme vibration response levels in mistuned blisks, which are blisks with blades...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041004.
Published Online: July 19, 2011
...S. Naik; C. Georgakis; T. Hofer; D. Lengani This paper investigates the flow, heat transfer, and film cooling effectiveness of advanced high pressure turbine blade tips and endwalls. Two blade tip configurations have been studied, including a full rim squealer and a partial squealer with leading...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031019.
Published Online: July 15, 2011
... flat test-surface. The three-dimensional pressure distribution that is established on the test-surface approximates the pressure distributions encountered on swept blades. This type of pressure field produces crossflows in the laminar boundary layer upstream of the separation and within the separation...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031015.
Published Online: July 15, 2011
... investigated the combined influence of all cooling circuits. Heat-flux measurements for the airfoil, platform, tip, and root of the turbine blade, as well as the shroud and the vane side of the purge cavity, are used to track the influence of cooling flow. By independently varying the coolant flow rate through...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031010.
Published Online: July 15, 2011
... proper design corrected conditions. Part I of this paper describes the overall experimental matrix, the influence of the cooling mass flows, and temperature profiles from an aerodynamic perspective. The measurements include internal and external pressures for the blade airfoil. Part II of this paper...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031012.
Published Online: July 15, 2011
..., drives the ingestion of hot gas through the rim seals. Externally induced (EI) ingress is caused by the circumferential distribution of pressure created by the blades and vanes in the turbine annulus: Ingress occurs in those regions where the external pressure is higher than that in the wheel-space, and...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031016.
Published Online: July 15, 2011
...Marco Raciti Castelli; Ernesto Benini This paper presents a model for the evaluation of energy performance and aerodynamic forces acting on a small helical Darrieus vertical axis wind turbine depending on blade inclination angle. It consists of an analytical code coupled to a solid modeling...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031022.
Published Online: July 15, 2011
... blade cooling configuration. A transient liquid crystal technique was used to take spatially resolved surface heat transfer measurements for the ground area between the ribs. A comparison with the smooth baseline configuration reveals local differences and a generally reduced heat transfer for the rib...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031007.
Published Online: July 14, 2011
... 50% for δ = 0.2 and by 45% for δ = 0.3 on the leading side from that of the stationary case. 08 07 2010 22 07 2010 14 07 2011 14 07 2011 blades boundary layers channel flow Coriolis force flow simulation heat transfer turbines Modern turbine blades are...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031009.
Published Online: July 14, 2011
...Jeffrey P. Bons; Jon Pluim; Kyle Gompertz; Matthew Bloxham; John P. Clark The synchronous application of flow control in the presence of unsteady wakes was studied on a highly loaded low pressure turbine blade. At low Reynolds numbers, the blade exhibits a nonreattaching separation bubble under...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031003.
Published Online: July 14, 2011
...Budimir Rosic; Liping Xu Blade lean, i.e., nonradial blade stacking, has been intensively used over the past in the design process of low aspect ratio gas and steam turbines. Although its influence on turbine efficiency is not completely understood, it has been proved as an effective way of...