The Experts below are selected from a list of 22149 Experts worldwide ranked by ideXlab platform
Eduardo Carpentieri - One of the best experts on this subject based on the ideXlab platform.
-
lm2500 gas turbine fuel Nozzle Design and combustion test evaluation and emission results with simulated gasified wood product fuels
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 1999Co-Authors: Charles E Neilson, Douglas George Shafer, Eduardo CarpentieriAbstract:The Brazilian Wood Biomass Demonstration Project (WBP) Phase II was contracted with the United Nations Development Programme-PNUD, Setor Comerical Norte, Quadra 2-BLOCO A, EDF. Corporation-7o Andar, Brasilia-DF Brasil 70712-900 and General Electric Marine and Industrial Engines to develop the gas turbine equipment necessary to utilize fuel produced by the gasification of wood products. The program included performance studies, control specification requirements, bleed and fuel valve specifications, a modified dual gas fuel Nozzle for fuel delivery to the combustor and results of two combustor component tests utilizing biomass simulated fuel. This paper will deal primarily with the fuel Nozzle Design elements, the setup and evaluation of the component combustor tests and resulting emissions produced by the simulated Biomass fuel. Details of the combustor test arrangement, facilities and special test equipment needed to complete the evaluation will be presented. In addition, background on the two types of combustor testing will be discussed.
-
lm2500 gas turbine fuel Nozzle Design and combustion test evaluation and emission results with simulated gasified wood product fuels
Volume 3: Coal Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, 1998Co-Authors: Charles E Neilson, Douglas George Shafer, Eduardo CarpentieriAbstract:The Brazilian Wood Biomass Demonstration Project (WBP) Phase II was contracted with the United Nations Development Programme - PNUD, Setor Comerical Norte, Quadra 2 - BLOCO A, EDF.Corporation-7° Andar, Brasilia - DF Brasil 70712-900 and General Electric Marine & Industrial Engines to develop the gas turbine equipment necessary to utilize fuel produced by the gasification of wood products. The program included performance studies, control specification requirements, bleed and fuel valve specifications, a modified dual gas fuel Nozzle for fuel delivery to the combustor and results of two (2) combustor component tests utilizing biomass simulated fuel. This paper will deal primarily with the fuel Nozzle Design elements, the setup and evaluation of the component combustor tests and resulting emissions produced by the simulated Biomass fuel. Details of the combustor test arrangement, facilities and special test equipment needed to complete the evaluation will be presented. In addition, background on the two types of combustor testing will be discussed.Copyright © 1998 by ASME
Hanne M Kooy - One of the best experts on this subject based on the ideXlab platform.
-
accurate monte carlo simulations for Nozzle Design commissioning and quality assurance for a proton radiation therapy facility
Medical Physics, 2004Co-Authors: H Paganetti, H Jiang, Hanne M KooyAbstract:Monte Carlo dosimetry calculations are essential methods in radiation therapy. To take full advantage of this tool, the beam delivery system has to be simulated in detail and the initial beam parameters have to be known accurately. The modeling of the beam delivery system itself opens various areas where Monte Carlo calculations prove extremely helpful, such as for Design and commissioning of a therapy facility as well as for quality assurance verification. The gantry treatment Nozzles at the Northeast Proton Therapy Center (NPTC) at Massachusetts General Hospital (MGH) were modeled in detail using the GEANT4.5.2 Monte Carlo code. For this purpose, various novel solutions for simulating irregular shaped objects in the beam path, like contoured scatterers, patient apertures or patient compensators, were found. The four-dimensional, in time and space, simulation of moving parts, such as the modulator wheel, was implemented. Further, the appropriate physics models and cross sections for proton therapy applications were defined. We present comparisons between measured data and simulations. These show that by modeling the treatment Nozzle with millimeter accuracy, it is possible to reproduce measured dose distributions with an accuracy in range and modulation width, in the case of a spread-out Bragg peak (SOBP), of better than 1 mm. The excellent agreement demonstrates that the simulations can even be used to generate beam data for commissioning treatment planning systems. The Monte Carlo Nozzle model was used to study mechanical optimization in terms of scattered radiation and secondary radiation in the Design of the Nozzles. We present simulations on the neutron background. Further, the Monte Carlo calculations supported commissioning efforts in understanding the sensitivity of beam characteristics and how these influence the dose delivered. We present the sensitivity of dose distributions in water with respect to various beam parameters and geometrical misalignments. This allows the definition of tolerances for quality assurance and the Design of quality assurance procedures.
Michael E. Mackay - One of the best experts on this subject based on the ideXlab platform.
-
computational fluid dynamics simulation of the melting process in the fused filament fabrication additive manufacturing technique
Additive manufacturing, 2020Co-Authors: David D Phan, Jeffrey S Horner, Zachary R Swain, Antony N Beris, Michael E. MackayAbstract:Abstract Numerical simulation is used to understand the melting and pressurization mechanism in fused filament fabrication (FFF). The results show the incoming fiber melts axisymmetrically, forming a cone of unmelted material in the center surrounded by melted polymer. Details of the simulation reveal that a recirculating vortex of melted polymer is formed at the fiber entrance to the hot end. The large viscosity within this vortex acts to effectively seal the system against back-pressures of order 1000 psi (10 MPa), which are typical under standard printing conditions. The Generalized Newtonian Fluid (GNF) model was appropriate for simulation within the region that melts the fiber, however, a viscoelastic model, the Phan-Thien-Tanner (PTT) model, was required to capture flow within the Nozzle. This is due to the presence of an elongational flow as molten material transitions from the melting region (diameter of 3 mm) to the Nozzle at the exit (diameter of 0.5 mm). Remarkably, almost half the pressure drop occurs over the short capillary (0.5 mm in length) attached to the end of the converging flow region. Increased manufacturing rates are limited by high pressures, necessitating more consideration in the Nozzle Design of future FFF printers.
Charles E Neilson - One of the best experts on this subject based on the ideXlab platform.
-
lm2500 gas turbine fuel Nozzle Design and combustion test evaluation and emission results with simulated gasified wood product fuels
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 1999Co-Authors: Charles E Neilson, Douglas George Shafer, Eduardo CarpentieriAbstract:The Brazilian Wood Biomass Demonstration Project (WBP) Phase II was contracted with the United Nations Development Programme-PNUD, Setor Comerical Norte, Quadra 2-BLOCO A, EDF. Corporation-7o Andar, Brasilia-DF Brasil 70712-900 and General Electric Marine and Industrial Engines to develop the gas turbine equipment necessary to utilize fuel produced by the gasification of wood products. The program included performance studies, control specification requirements, bleed and fuel valve specifications, a modified dual gas fuel Nozzle for fuel delivery to the combustor and results of two combustor component tests utilizing biomass simulated fuel. This paper will deal primarily with the fuel Nozzle Design elements, the setup and evaluation of the component combustor tests and resulting emissions produced by the simulated Biomass fuel. Details of the combustor test arrangement, facilities and special test equipment needed to complete the evaluation will be presented. In addition, background on the two types of combustor testing will be discussed.
-
lm2500 gas turbine fuel Nozzle Design and combustion test evaluation and emission results with simulated gasified wood product fuels
Volume 3: Coal Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations, 1998Co-Authors: Charles E Neilson, Douglas George Shafer, Eduardo CarpentieriAbstract:The Brazilian Wood Biomass Demonstration Project (WBP) Phase II was contracted with the United Nations Development Programme - PNUD, Setor Comerical Norte, Quadra 2 - BLOCO A, EDF.Corporation-7° Andar, Brasilia - DF Brasil 70712-900 and General Electric Marine & Industrial Engines to develop the gas turbine equipment necessary to utilize fuel produced by the gasification of wood products. The program included performance studies, control specification requirements, bleed and fuel valve specifications, a modified dual gas fuel Nozzle for fuel delivery to the combustor and results of two (2) combustor component tests utilizing biomass simulated fuel. This paper will deal primarily with the fuel Nozzle Design elements, the setup and evaluation of the component combustor tests and resulting emissions produced by the simulated Biomass fuel. Details of the combustor test arrangement, facilities and special test equipment needed to complete the evaluation will be presented. In addition, background on the two types of combustor testing will be discussed.Copyright © 1998 by ASME
Joop Schoonman - One of the best experts on this subject based on the ideXlab platform.
-
Electrostatic sol-spray deposition of nanostructured ceramic thin films
Journal of Aerosol Science, 1999Co-Authors: C.-h. Chen, M. H J Emond, E.m. Kelder, Ben De Meester, Joop SchoonmanAbstract:Electrospraying has been developed into an electrostatic spray deposition technique for the deposition of ceramic thin films. The cone-jet spraying mode appears to be the most preferable for this purpose, and the domain where the cone-jet mode exists was found to depend strongly on the Nozzle Design. A Nozzle with a large diameter and a tilted outlet widens the windows for both the applied high DC voltage and the flow rates of a precursor liquid keeping the cone-jet mode intact. The results of three Nozzle Designs are compared, one of which has been selected for feeding two different precursor liquids simultaneously. With three relevant sols as precursor liquids, nanostructured thin films of ZnO, ZrO2, and Al2O3have been deposited. Their morphologies are dependent on the preparation of the precursor sols and the deposition temperature. Highly porous films were obtained by using a high deposition temperature and a sol prepared from a metal alkoxide or a metal acetate.
