References of "Ngendakumana, Philippe"
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See detailEnergetic and Environmental Aspects of a Diesel Engine Using Rapeseed Oil as Fuel
Christiaens, Sébastien; Bruylants, Grégory; Ngendakumana, Philippe ULg

in 19th International Conference on Efficiency, Cost, Optimization , Simulation and Environmental Impact of Energy Systems (ECOS 2006) (2006, July)

This paper describes the experiment that was carried out at the Thermodynamics Laboratory of the University of Liège (Belgium) to study the impact of the use of vegetable oil as a substitute for light oil ... [more ▼]

This paper describes the experiment that was carried out at the Thermodynamics Laboratory of the University of Liège (Belgium) to study the impact of the use of vegetable oil as a substitute for light oil on the short-term performance of Diesel engines for cars. The vegetable oil selected is derived directly from rapeseed without any refinement processes. Five tests were carried out, going from 0% rapeseed oil blended in conventional Diesel fuel (reference fuel) up to 100% rapeseed oil. For each test, the whole operating range of the engine was swept and the fuel consumption and exhaust emissions measured simultaneously. The study concludes that the engine used during the research can be run with 100% unrefined rapeseed oil. Nevertheless, using 100% oil is not considered as a valid large scale solution. However, using a smaller percentage of rapeseed oil gives promising results in terms of reduction of CO2 emission as well as reduction of the opacity of the exhaust gases. [less ▲]

Detailed reference viewed: 42 (8 ULg)
See detailPhotodetection Signals for Controlling Combustion
Parada, Luis; Ngendakumana, Philippe ULg

Report (2006)

Detailed reference viewed: 11 (0 ULg)
See detailRéalisation et validation d’un banc du système de refroidissement pour pile à combustible de véhicule
Cuevas, Cristian; Duysinx, Pierre ULg; Hannay, Jules et al

Report (2006)

Detailed reference viewed: 2 (1 ULg)
See detailEnergy conservation and CO emissions of fuel oil boilers used in domestic heating
Cuevas, Cristian; Ngendakumana, Philippe ULg

Conference (2006, May)

According to the European standard, the CO emissions of new fuel oil boilers, whose output power is lower than 400 kW, are limited in steady-state regime to 110 mg/kWh of energy consumption. In order to ... [more ▼]

According to the European standard, the CO emissions of new fuel oil boilers, whose output power is lower than 400 kW, are limited in steady-state regime to 110 mg/kWh of energy consumption. In order to assess the performance of actual fuel oil boilers, an experimental work has been performed on a boiler available in the laboratory and whose output nominal power is about 370 kW. The two main parameters investigated are the nozzle capacity and the corresponding fuel injection pressure to keep the same burner consumption. Four nozzles whose capacity ranges from 30 to 45 kg/h at 20 bar were fitted on the burner equipping the fuel oil boiler. All the nozzles used are spill return and 45° type. To assess the CO emissions of the fuel oil boiler, tests have been performed in transient and steady-state regimes. The tests were performed so that the output power was kept constant in steady-state regime (same water flow rate and inlet and outlet temperatures). That is why for each nozzle tested, the fuel injection pressure has been adjusted in order to maintain the fuel mass flow rate at around 37.7 kg/h. On the other hand, the oxygen content of the flue gas in the chimney was kept constant (around 3%) by adjusting only the position of the burner air damper (the position of the flame holder was kept constant) and thus the air combustion mass flow rate. Classical gas analysers were used to measure the CO2, O2, CO and NOx concentrations in the flue gas. The tests performed showed that in steady-state regime, the CO emissions are very low compared to the European standard. On the other hand, in the transient regime (start-up regime for a cycling boiler), the CO emissions are not negligible and increase significantly if a high capacity nozzle is fitted on the fuel oil burner. In short, the paper demonstrates that in order to increase the boiler thermal efficiency and thus to reduce CO2 emissions (for the same output power), one has to avoid the CO emissions in the transient regime. When performing a replacement of the burner nozzle, a low capacity nozzle associated with an adjustment of a high fuel injection pressure is recommended, since a reduction of CO emissions in the starting-up regime is achieved and, on the other hand, the thermal efficiency and the pollutants emissions of the fuel oil boiler in steady state regime are not affected. [less ▲]

Detailed reference viewed: 31 (0 ULg)
See detailDéveloppement et validation d’un modèle de radiateur de voiture
Cuevas, Cristian; Ngendakumana, Philippe ULg

Report (2006)

Detailed reference viewed: 9 (1 ULg)
See detailPerformances thermiques initiales de produits minces réfléchissants
Flamant, Gilles; Wouters, Peter; L'Heureux, Didier et al

Report (2006)

La méthodologie retenue consistait à déterminer les performances thermiques des PMR, d’une part, sur la base de mesures en laboratoire (dans des conditions aux limites stationnaires) et, d’autre part, sur ... [more ▼]

La méthodologie retenue consistait à déterminer les performances thermiques des PMR, d’une part, sur la base de mesures en laboratoire (dans des conditions aux limites stationnaires) et, d’autre part, sur la base de mesures réalisées dans des cellules d’essai soumises à des conditions extérieures réelles (régime par essence non stationnaire). Les résultats de ces deux types de mesures ont été comparés entre eux ainsi qu’à des résultats de calculs réalisés onformément aux normes en vigueur. [less ▲]

Detailed reference viewed: 10 (0 ULg)
See detailNozzle Capacity and Emissions of a Domestic Fuel Oil Boiler
Masy, Cédric; Ngendakumana, Philippe ULg

Conference (2005, September)

In order to investigate the influence of the nozzle capacity on the performance of fuel oil boilers, tests have been performed in transient and steady state regimes on our experimental boiler. The aim of ... [more ▼]

In order to investigate the influence of the nozzle capacity on the performance of fuel oil boilers, tests have been performed in transient and steady state regimes on our experimental boiler. The aim of the tests was to deduce the better couple nozzle - fuel injection pressure to reach the desired output power while producing fewer pollutants as possible. In short, a high fuel injection pressure associated with a low capacity nozzle is recommended. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailPROPULSION AND VEHICLE INTEGRATION FOR REUSABLE LAUNCHER USING IN-FLIGHT OXYGEN COLLECTION
Bizzarri, Didier; Hendrick, Patrick; Heyen, Georges ULg et al

in EUROPEAN CONFERENCE FOR AEROSPACE SCIENCES (EUCASS) (2005, July)

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen ... [more ▼]

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen the available design margins in order to reduce the required technological leap and limit the economical risk associated with such a development. The aim of the ESA-funded theoretical and experimental study on an air separation device is to demonstrate the possibility of performing efficient air distillation in a compact rotating column. An integration of the vehicle, propulsion system and separation unit designs is presented aiming to optimise the overall vehicle performance while keeping technological difficulty and system complexity at a reasonable level. Reference vehicles are presented in their specific mission profiles with an emphasis on TSTO’s. Different layouts of the internal energy and mass flowsheets have been studied and were compared in order to make best use of the refrigeration capacity of the hydrogen fuel running though the propulsion system during the first phase of the flight considering the separator as a classical distillation column. This analysis provides the requirements in terms of heat exchange capacity, compression ratios and number of so-called transfer units needed in the separator. Here, the system is intentionally kept simple, to limit complexity, but the analysis is thorough and accurate, including, for example, the effect of the presence of argon. Results for a supersonic carrier are presented. An analysis of the separation unit to reach those requirements has been performed. That includes internals, practical building with estimates of pressure drop, separation performance and flow limitation. The sizing of the separator bed is provided for a carrier plane showing that such on-board separator is indeed practical. [less ▲]

Detailed reference viewed: 21 (2 ULg)
Peer Reviewed
See detailExperimental Study Of An In-Flight Air Separation Device
Bizzarri, Didier; Hendrick, Patrick; Heyen, Georges ULg et al

in AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference (2005, May)

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this ... [more ▼]

Intending to provide in-flight Oxygen Collection capability to new launchers, a subscale model of a centrifugally enhanced air distillation unit is under development. The vehicle we foresee for this application is described elsewhere, the present paper concentrating only on the technological and experimental aspects. While the test setup has already been shown to be able to provide the adequate cooling power, the rig is still under construction. The experimental and technical aspects include choices and main trade-offs that had to be made during the design process. Of particular interest are the stainless steel all welded heat exchangers allowing for deep cooling and liquefaction of air from the main compressor and dryers. Specifically, developed hardware is described in details. On the test rig side, design of the rotating cryogenic separator is explained, including mechanical aspects, heat management and sealing. The whole system has modes of operation allowing, among other parameters, to explore various air compositions and mass flows rates on the gaseous and liquid sides. Perspectives are given for the testing of the separator. [less ▲]

Detailed reference viewed: 107 (3 ULg)
Peer Reviewed
See detailIntegration of vehicle, propulsion system and separation unit designs for a launcher using in-flight oxygen collection
Bizzarri, Didier; Hendrick, Patrick; Heyen, Georges ULg et al

in AIAA/CIRA 13th International Space Planes and Hypersonics Systems and Technologies Conference (2005, May)

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen ... [more ▼]

The use of in-flight Oxygen Collection has shown to significantly improve space launcher performance. The conceptual approach followed by the Royal Military Academy of Brussels (RMA) has tried to widen the available design margins in order to reduce the required technological leap and limit the economical risk associated with such a development. The aim of the ESA-funded theoretical and experimental study on an air separation device is to demonstrate the possibility of performing efficient air distillation in a compact rotating column. An integration of the vehicle, propulsion system and separation unit designs is presented aiming to optimise the overall vehicle performance while keeping technological difficulty and system complexity at a reasonable level. Reference vehicles are presented in their specific mission profiles with an emphasis on TSTO’s. Different layouts of the internal energy and mass flowsheets are compared, in order to make best use of the refrigeration capacity of the hydrogen fuel running though the propulsion system during the first phase of the flight considering the separator as a classical distillation column. This analysis provides the requirements in terms of heat exchange capacity, compression ratios and number of so-called transfer units needed in the separator. Here, the system is intentionally kept simple, to limit complexity, but the analysis is thorough and accurate, including, for example, the effect of the presence of argon. An analysis of the separation unit to reach those requirements is proposed. That includes internals, practical building with estimates of pressure drop, separation performance and flow limitation. Analysis of size reduction of the distillation unit from usual 1-g column to the high-g unit is provided as well as the scale up methodology of laboratory results. First experimental results obtained with our centrifugally enhanced distillation separation system are presented and perspectives for a larger on-board operational unit proposed. [less ▲]

Detailed reference viewed: 29 (2 ULg)