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Papers by Eder Bautista
Volume 6: Turbomachinery, Parts A, B, and C, 2008
The unsteady aerodynamic and aero-thermal performance of a first stage gas turbine bucket with th... more The unsteady aerodynamic and aero-thermal performance of a first stage gas turbine bucket with thermal barrier coating (TBC) and internal cooling configuration were investigated by application of a three dimensional Navier-Stokes commercial turbomachinery oriented CFD-code. Convection and conduction were modeled for a super alloy blade with TBC. The CFD simulations were configured with a mesh domain including the nozzle and bucket inter-stage in order to accurately predict the fluid parameters at inlet and outlet of bucket. Comparisons to the gas turbine manufacturer data have permitted to validate the flow conditions at the inlet of the rotor. The effects of blade TBC surface temperature changes during a start-up cycle were simulated by means of an unsteady simulation, with unsteady inlet/outlet boundary conditions specified according to test data. The calculations include not only the fluid but also the solving of conduction within the blade, allowing for a correct modeling of the...
Microporous and Mesoporous Materials, 2008
Chromium oxide nanocrystals were synthesized by solid thermal decomposition using cetyltrimethyla... more Chromium oxide nanocrystals were synthesized by solid thermal decomposition using cetyltrimethylammonium bromide (CTAB) or a triblock copolymer (P123) as template agent at low temperature. The chromium oxide nanocrystals possess lamellar phase with disordered mesopore. The template surfactants (P123 or CTAB) and hydrated water play an important bridging role in the aggregation of inorganic chromium species in the thermal decomposition of chromium nitration. The mesopores of chromium oxide are formed by eliminating CTAB or P123 from the Cr-surfactants composites with small shrinkage.
Start-Up and Shut-Down Simulation of a Thermal Barrier Coated Gas Turbine Bucket Using CFD Code, 2008
The unsteady aerodynamics and aerothermics of a first stage gas turbine bucket with thermal barri... more The unsteady aerodynamics and aerothermics of a first stage gas turbine bucket with thermal barrier coating (TBC) and internal cooling configuration were investigated by application of a three dimensional Navier-Stoke commercial turbomachinery oriented CFD-code. Convection and conduction were modeled for a super alloy blade with TBC. This work is the second part of the paper “Unsteady 3-d conjugated heat transfer simulation of a thermal barrier coated gas turbine bucket”, and includes the simulation of shut down cycle. The CFD simulations were configured with a mesh domain of nozzle and bucket inter-stage using real turbine parameter data as boundary condition (BC) at nozzle inlet. The BC’s were adjusted in accordance with standard start-up and shut-down diagram for a gas turbine from Takahashi work [3]. Additionally a parabolic turbine inlet temperature was set for main gas flow. The problem was launched in a minicluster of 8 HP Workstation. Reasonably good comparisons in the main ...
Volume 6: Turbomachinery, Parts A, B, and C, 2008
ASME 2008 Power Conference, 2008
Chromium oxide nanoparticles (NPs) have been rapidly synthesized by precipitation method using am... more Chromium oxide nanoparticles (NPs) have been rapidly synthesized by precipitation method using ammomia as precipitating agent and are characterized by using X-ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), UV-Visible absorption (UV), Infrared Spectoscopy (IR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). XRD studies show that chromium oxide NP is formed as Cr 2 O 3 and it has hexagonal structure. The shape and particle size of the synthesized Cr 2 O 3 NPs is determined by SEM and TEM. The images showed that the size of NPs of Cr 2 O 3 varied from 20 nm to 70 nm with average crystalline size 45 nm. UV-Visible absorption and IR spectoscopy confirm the formation of nanosized Cr 2 O 3 . TGA verifies that the Cr 2 O 3 NPs are thermally stable upto 1000 °C.
Volume 6: Turbomachinery, Parts A, B, and C, 2008
The unsteady aerodynamic and aero-thermal performance of a first stage gas turbine bucket with th... more The unsteady aerodynamic and aero-thermal performance of a first stage gas turbine bucket with thermal barrier coating (TBC) and internal cooling configuration were investigated by application of a three dimensional Navier-Stokes commercial turbomachinery oriented CFD-code. Convection and conduction were modeled for a super alloy blade with TBC. The CFD simulations were configured with a mesh domain including the nozzle and bucket inter-stage in order to accurately predict the fluid parameters at inlet and outlet of bucket. Comparisons to the gas turbine manufacturer data have permitted to validate the flow conditions at the inlet of the rotor. The effects of blade TBC surface temperature changes during a start-up cycle were simulated by means of an unsteady simulation, with unsteady inlet/outlet boundary conditions specified according to test data. The calculations include not only the fluid but also the solving of conduction within the blade, allowing for a correct modeling of the...
Microporous and Mesoporous Materials, 2008
Chromium oxide nanocrystals were synthesized by solid thermal decomposition using cetyltrimethyla... more Chromium oxide nanocrystals were synthesized by solid thermal decomposition using cetyltrimethylammonium bromide (CTAB) or a triblock copolymer (P123) as template agent at low temperature. The chromium oxide nanocrystals possess lamellar phase with disordered mesopore. The template surfactants (P123 or CTAB) and hydrated water play an important bridging role in the aggregation of inorganic chromium species in the thermal decomposition of chromium nitration. The mesopores of chromium oxide are formed by eliminating CTAB or P123 from the Cr-surfactants composites with small shrinkage.
Start-Up and Shut-Down Simulation of a Thermal Barrier Coated Gas Turbine Bucket Using CFD Code, 2008
The unsteady aerodynamics and aerothermics of a first stage gas turbine bucket with thermal barri... more The unsteady aerodynamics and aerothermics of a first stage gas turbine bucket with thermal barrier coating (TBC) and internal cooling configuration were investigated by application of a three dimensional Navier-Stoke commercial turbomachinery oriented CFD-code. Convection and conduction were modeled for a super alloy blade with TBC. This work is the second part of the paper “Unsteady 3-d conjugated heat transfer simulation of a thermal barrier coated gas turbine bucket”, and includes the simulation of shut down cycle. The CFD simulations were configured with a mesh domain of nozzle and bucket inter-stage using real turbine parameter data as boundary condition (BC) at nozzle inlet. The BC’s were adjusted in accordance with standard start-up and shut-down diagram for a gas turbine from Takahashi work [3]. Additionally a parabolic turbine inlet temperature was set for main gas flow. The problem was launched in a minicluster of 8 HP Workstation. Reasonably good comparisons in the main ...
Volume 6: Turbomachinery, Parts A, B, and C, 2008
ASME 2008 Power Conference, 2008
Chromium oxide nanoparticles (NPs) have been rapidly synthesized by precipitation method using am... more Chromium oxide nanoparticles (NPs) have been rapidly synthesized by precipitation method using ammomia as precipitating agent and are characterized by using X-ray Diffraction (XRD), Thermo Gravimetric Analysis (TGA), UV-Visible absorption (UV), Infrared Spectoscopy (IR), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). XRD studies show that chromium oxide NP is formed as Cr 2 O 3 and it has hexagonal structure. The shape and particle size of the synthesized Cr 2 O 3 NPs is determined by SEM and TEM. The images showed that the size of NPs of Cr 2 O 3 varied from 20 nm to 70 nm with average crystalline size 45 nm. UV-Visible absorption and IR spectoscopy confirm the formation of nanosized Cr 2 O 3 . TGA verifies that the Cr 2 O 3 NPs are thermally stable upto 1000 °C.