Search

Your search keyword '"Lazaroiu, Gheorghe"' showing total 228 results
Start Over Author "Lazaroiu, Gheorghe"
228 results on '"Lazaroiu, Gheorghe"'

2. A General Cost Model in a Cloud Data Center

Author

Radulescu, Constanta Zoie, Radulescu, Delia Mihaela, Lazaroiu, Gheorghe, Sipica, Alexandru, Barbu, Dragos, Howlett, Robert J., Series Editor, Jain, Lakhmi C., Series Editor, Ciurea, Cristian, editor, Boja, Cătălin, editor, Pocatilu, Paul, editor, and Doinea, Mihai, editor

Published
2022
Full Text
View/download PDF

4. The Matrix of Energy Biofuels

Author

Lazaroiu, Gheorghe, Mihaescu, Lucian, Ciupageanu, Dana-Alexandra, Negreanu, Gabriel-Paul, Lazaroiu, Gheorghe, editor, and Mihaescu, Lucian, editor

Published
2021
Full Text
View/download PDF

36. COMPARATIVE ANALYSIS FOR COMBUSTION CH4 AND H2 FOR COAXIAL JET BURNERS (DIFFUSE COMBUSTION).

Author

MIHAESCU, Lucian, STANCIU, Dorin, LAZAROIU, Gheorghe, JARCU, Elena-Adriana, and GRIGORIU, Rodica Manuela

Subjects
GAS turbine combustion, HYDROGEN flames, METHANE flames, COMBUSTION, FLAME, HYDROGEN as fuel, GAS as fuel
Abstract

The use of hydrogen as a fuel requires as much research as possible on the construction and functional parameters for the development of appropriate burners. The researches undertaken are addressed to diffuse flame burners with concentric jets of fuel and air. These burners cannot lead to flame return, the combustion being much safer, than for the case of burners with fuel-air mixture. The researches were carried out by numerical modeling through the ANSYS-FLUENT V.14.0 software. An important stage of the research, carried out theoretically, included the establishment of the hydrogen velocity at the exit of the burner section. Compared to this size, the question of the level of air velocity in the accompanying jet was further raised. It simulated operation with both a low level of air velocity and a high level up to the value of the fuel speed. The processing of the obtained data demonstrated the superiority of the flames with high air velocities, but also the great concordance between the flame obtained at the combustion of hydrogen with that of methane. The numerical modeling aimed at determining the conditions of hydrogen combustion for a hydrogen-air coaxial admission for the realization of methane-like flames. This also responds to the behavior of the hydrogen flame in the combustion chambers of the gas turbines, which are intended to modify the burner and not the room itself. The fact that the length of the hydrogen flame was about 10% below that of the methane flame also gives a positive response to this technical application. If in gas turbines the fuel compressor can provide hydrogen speed at the outlet of the burner, for other industrial applications there remains an open problem of ensuring hydrogen pressure. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

38. Researches on the mixture limits of animal fats with liquid hydrocarbons for combustion at industrial level

Author

Bondrea Dana Andreya, Mihaescu Lucian, Lazaroiu Gheorghe, Pisa Ionel, and Negreanu Gabriel

Subjects
Environmental sciences, GE1-350
Abstract

The experimental research has highlighted the variety of possibilities of combustion of animal fat from bovine and swine mixed with liquid hydrocarbons. Previous research has established that the upper limit for an efficient combustion was 30 %. For a perfect mixing, the lower temperature limit was set to 40 °C. In the fuel laboratory, at the department TMETF was determined the viscosity of the mixtures for different proportions. The values obtained for various concentrations and preheating temperatures were close to the values for liquid hydrocarbons. The experimental researches have studied the combustion of the mixture using a mechanically spraying burner with constant pressure between 14 and 18 bar. The aspiration of the mixture is done from a specially designed tank; this tank is equipped with an electric heater, in order to maintain the mixture at a constant temperature between 40 °C to 50 °C. After that, the burner heats again the mixture with an integrated heating device up to 75 °C. The burner is also equipped with an air blower, pump and a calibrated nozzle. The combustion resulted from the experimental boiler with a power rated to 55 kW were monitored with a thermal vision camera and an exhaust gas analyser. This research has demonstrated the viability of using this type of mixtures in energetic burning equipment designed for liquid hydrocarbons.

Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results