1,721,000 research outputs found
BIM Reverse Engineering: Digital Transformation of Existing Roads
No full textThe raising of the transport infrastructure sector through the digital transformation of roads is a factor for sustainable and intelligent development of the Country, in order to create safer, cheaper, better-used and fruited infrastructures generating data and services for a better travel experience for citizens, facilitating freight transport and helping to determine a technology-friendly ecosystem for businesses. A specific need for the digital transformation of roadways consists in acquiring the geometric features of existing roads. The process is known as reverse engineering, or Scan to BIM, and generates object models that can be implemented and usable on BIM platforms. BIM is the tool that best suits these operational needs in the various fields and in all the advancing stages of the life cycle of the work, from conception to disposal. The case study shows the solid parametric modeling of the rural road SP430 "Cilentana" (SS18VAR), one of the main route for the Southern areas of Campania Region. The BIM platform provides the ability to extract road alignment, profiles and cross sections from the 3D model at any time. Processes can be dynamically updated as a result of any modifications made to the model for extraordinary adjustments and/or maintenance of the road. Autodesk Software packages Civil 3D and Infraworks were used in a combined approach
Numerical investigation of oxy-natural-gas combustion in a semi-industrial furnace: Validation of CFD sub-models
Full text linkThe modeling through computational fluid dynamics of oxy-natural-gas combustion experimental tests in a 3 MW semi-industrial furnace equipped with a low NOx burner is discussed. Since the complex geometry of the burner and the size of the furnace, a modeling strategy has been adopted to diminish the computational time and thus to make the simulations affordable. The model aims at validating different sub-models (e.g. combustion/kinetics, radiation/spectral) for oxy-natural-gas fired conditions through the comparison of predictions and in-flame measurements of temperature and chemical species. It is found that fast chemistry approaches are unable to predict the temperature field. The spectral model was also found to play a fundamental role for the correct analysis of such scale devices. Uncertainties in experimental and modeling results are discussed and compared
Modeling oxy-combustion gas and coal tests on Fosper (3 MW) comparing different validation approaches
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Investigation on swirled pulverised coal flame in a semi-industrial scale furnace: experiments and mathematical modelling
No full textVerification, validation and uncertainties quantification in industrial combustion modelling: some practical tools
No full textAnalisi dell’ossicombustione di carbone attraverso prove in reattore a flusso trascinato
No full textUn reattore a flusso trascinato in grado di garantire elevate temperature (1000-1600 K) e velocità di riscaldamento (104-105 K/s), in un intervallo di tempi di residenza tra 50 e 1500ms, è utilizzato per studiare il comportamento del carbone in condizioni di ossicombustione. La sperimentazione avviene a diversi livelli e con diverse tecniche ed è affiancata dalla modellazione numerica per qualificare l’apparecchiatura
Retrofitting oxy-fuel technology in a semi-industrial plant: Flame characteristics and NO(x) production from a low NO(x) burner fed with natural gas
No full textThis paper reports part of the results of the campaigns performed on a low NO(x) burner, firing natural gas in oxy-fuel conditions. The results of combustion tests on burning natural gas with different flue gas recycle rates are presented, with a particular emphasis on NO(x) production that might affect retrofitting of oxy-fuel technology in conventional boilers. The process and flame characterisation performed on natural gas provides a valuable set of experimental data for the technological development of oxy-combustion burner technology with recycled flue gas, especially in retrofitting scenarios. The data can be used to develop a better understanding of the chemical and physical phenomena involved in oxy-fuel combustion and can provide modellers with a valuable hint for the development of specific sub-models for oxy-combustion simulation. Since is seems technologically unfeasible to reduce down to zero the presence of nitrogen in recycled flue gases, due to air in-leakages, the presence of relatively small amounts of nitrogen in crucial location in the burner provides a thermal NO(x) source, depending on local levels of temperature and oxygen concentration. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved
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