References of "Ngendakumana, Philippe"
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See detailEtude expérimentale du refroidissement diphasique indirect d’une pile à combustible
Cuevas, Cristian; Winandy, Eric; Ngendakumana, Philippe ULg

Report (2002)

Detailed reference viewed: 8 (2 ULg)
See detailEXPERIMENTAL INVESTIGATION OF NOx FORMATION MECHANISMS IN A FUEL-OIL BOILER
Tartari, Paula; Ngendakumana, Philippe ULg

Conference (2002, June)

The work whose results are reported in this paper was aimed at gathering information that can give a deeper insight into the structure of a diffusion fuel-oil flame. This allows us to get a better ... [more ▼]

The work whose results are reported in this paper was aimed at gathering information that can give a deeper insight into the structure of a diffusion fuel-oil flame. This allows us to get a better understanding of the combustion process and thus a correct basis for combustion modeling, focused on NOx formation. In order to attain the objective, axial and radial temperature, NOx and O2 concentration profiles have been measured in the flame for high and low firing rates of a domestic hot water boiler (around 424 and 270 kW respectively). Temperature was measured by means of two B-type thermocouples (diameters 0.5 and 0.35 mm) and NOx and O2 concentrations using a classical gas analyzer. Maximum NOx emissions (167 ppm at 424 kW and 134 ppm at 270 kW) were recorded in high oxygen concentration and low temperature zones of the flame ( ≈ 1000°C), where no thermal-NO can be formed. Flue gas recirculation and NOx destruction process is clearly demonstrated in the flame due to the higher NOx concentrations recorded in the combustion chamber near the burner exit than in the chimney. Near the burner exit NOx, O2 and temperature radial profiles are very unstable. Higher temperature fluctuations were detected with the small thermocouple in the measurements at 270 kW. The contribution of the three types of NOx formation mechanisms was obtained using a simplified model. According to these results, the majority of NOx in this type of flame could be caused by the prompt-NO mechanism, formed in the zone close to the burner exit at the location where secondary combustion air is introduced. [less ▲]

Detailed reference viewed: 30 (1 ULg)
See detailSiC-UV Photodiode for Combustion Control
Tartari, Paula; Ngendakumana, Philippe ULg

Report (2002)

Detailed reference viewed: 7 (0 ULg)
See detailUV-PHOTODIODE SELECTION FOR COMBUSTION CONTROL
Tartari, Paula; Ngendakumana, Philippe ULg

Report (2002)

Detailed reference viewed: 4 (1 ULg)
See detailINFLUENCE OF DIMETHOXYMETHANE (DMM) ADDITION IN LIGHT FUEL OIL ON THE FLAME EMISSION IN A DOMESTIC HOT WATER BOILER
Tartari, Paula; Ngendakumana, Philippe ULg

Conference (2001, September)

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler fitted ... [more ▼]

In order to investigate the soot reduction potentialities of DMM (called also methylal) addition in an overall lean diffusion flame, tests have been carried out on our experimental fuel oil boiler fitted with a burner equipped with a spill-return atomiser. The tests have been performed in steady-state regime without and with DMM addition (4% on mass basis). The two firing rates (low and high firing rates) of the burner have been adjusted successively. The flame emission was recorded by means of a photodiode, sensible in the visible region of the wavelength spectrum. The axial profiles of the flame emission obtained show clearly that an addition of DMM in the fuel oil leads to a decrease in the flame emission and thus a soot reduction. The NOx and CO emissions (measured at the chimney) and the thermal efficiency of the boiler were not significantly affected. [less ▲]

Detailed reference viewed: 14 (0 ULg)
See detailEFFECT OF CO2 INJECTION IN THE COMBUSTION AIR ON THE PERFORMANCE OF A HOT WATER DOMESTIC FUEL OIL BOILER
Milovanovic, Nebojsa; Ngendakumana, Philippe ULg

Conference (2000, August)

In order to investigate the effect of CO2 addition in the combustion air of a yellow flame burner, tests have been performed during which different volume flow rates of CO2 have been injected. For all the ... [more ▼]

In order to investigate the effect of CO2 addition in the combustion air of a yellow flame burner, tests have been performed during which different volume flow rates of CO2 have been injected. For all the tests performed, the burner consumption and the oxygen mole fraction in the flue gas have been kept quite constant, say at about 240 kW and 1.8 % (on dry basis) respectively. For the interpretation of the flame radiation results, tests have also been performed with N2 injection. The results gathered (for CO2 and N2 addition up to 4.8 % and 7.4 % in volume respectively) show that the thermal efficiency and the CO emission of the boiler are not affected. For small amounts of CO2 or N2 volume flow rates, there is a slight decrease of the NOx emission and the flame radiation. If the quantity of the additive is increased above a critical value, the flame becomes unstable and one observes first a sudden increase of the NOx emission and the flame radiation and then a decrease. That sudden increase is explained by the change of the flame shape and geometry. [less ▲]

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailFully and Partially Reusable TSTO launchers using In-Flight LOX Collection
Hendrick, Patrick; Breugeulmans, F.; Marquet, B. et al

in 22nd International Symposium on Space Technology and Science (ISTS) (2000, May)

Detailed reference viewed: 23 (0 ULg)
Peer Reviewed
See detailInvestigation of fuel oil flames by means of Emission Spectroscopy
Ngendakumana, Philippe ULg

in 5th International Conference on Technologies and Combustion for a Clean Environment (1999, July)

Detailed reference viewed: 21 (6 ULg)
See detailModélisation simplifiée du comportement thermique d'un bâtiment et vérification expérimentale
Ngendakumana, Philippe ULg

Book (1991)

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behavior are too complex and computer time consuming compared to the accuracy ... [more ▼]

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behavior are too complex and computer time consuming compared to the accuracy of the needed data they require and the assumptions generally made. By an electrical analogy, a model whose order is lower than 4 is first proposed to model the walls. Then, a proposal for a two second order model is made for a one zone building and how to connect the different rooms in a multi-zone building. The way to take into account the solar gains is also proposed. The model thus proposed has been validated experimentally on a small scale of a one zone building in laboratory and in "situ". In an occupied dwelling in a residential building, the occupation gains seemed to be one of the main uncertainty of the modeling. In that work, a simplified model for the inside heat transfer coefficients is also proposed and validated experimentally in a climatic chamber in order to predict the gradient temperature which occurs in a room. [less ▲]

Detailed reference viewed: 119 (5 ULg)
See detailModélisation simplifiée du comportement thermique d'un bâtiment et vérification expériementale
Ngendakumana, Philippe ULg

Doctoral thesis (1988)

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behaviour are too complex and computer time consuming compared to the ... [more ▼]

The buildings reference models (among others those based on the transfer functions of the walls) aimed to simulate the thermal behaviour are too complex and computer time consuming compared to the accuracy of the needed data they require and the assumptions generally made. By an electrical analogy, a model whose order is lower than 4 is first proposed to model the walls. Then, a proposal for a two second order model is made for a one zone building and how to connect the different rooms in a multi-zone building. The way to take into account the solar gains is also proposed. The model thus proposed has been validated experimentally on a small scale of a one zone building in laboratory and in "situ". In an occupied dwelling in a residential building, the occupation gains seemed to be one of the main uncertainty of the modelling. In that thesis, a simplified model for the inside heat transfer coefficients is also proposed and validated experimentally in a climatic chamber in order to predict the gradient temperature which occurs in a room. [less ▲]

Detailed reference viewed: 52 (6 ULg)