Philippe Scouflaire

Philippe Scouflaire
CentraleSupélec | ECP · Department of Energetics

Doctor of Engineering

About

109
Publications
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1,734
Citations

Publications

Publications (109)
Article
Full-text available
The objective of the present work is to show the potential of in situ measurements for the investigation of nanoparticles production in turbulent spray flames. This is achieved by considering multiple diagnostics to characterize the liquid break-up, the reactive flow and the particles production in a spray burner for TiO2 nanoparticle synthesis. Th...
Article
Lean premixed turbulent swirling combustion is known for significantly reducing pollutants emissions, when compared to non-premixed turbulent flames. Characterizing the swirl number influence is therefore essential to comparing different combustion chamber operational regimes. The present study is devoted to the experimental characterization of a n...
Conference Paper
Full-text available
This work aims at a better understanding of damping in coupled-cavities configurations such as liquid rocket engines (LRE). A cold flow rig called NPCC (New Pressurized Couple Cavities) is employed. It consists of two cavities mimicking dome and combustion chamber, linked by three injectors. The cavities can be either continuously excited or succes...
Article
This paperdescribes one possible approach to a numerical framework forareduced order tool that aimstosimulate combustion instabilities in liquid rocket engines. The numerical framework relies on the projection of the pressure fluctuations on the eigenmodes of the system. The pressure fluctuations are solutions of the wave equation of the system. Af...
Article
Full-text available
A detailed understanding of the mechanisms underlying soot production is needed to control particle emissions from practical combustion devices. This requires fundamental investigations of these processes in turbulent combustion systems. This study reports experiments on soot production in a perfectly premixed turbulent flame operating under rich c...
Conference Paper
Soot production in turbulent flames represents an urgent issue for applied systems and raises a range of fundamental challenges. Most of the literature effort on this question has been carried out on non-premixed turbulent flames, where mixing plays a dominant role. It is however interesting to see if soot production can be investigated in a premix...
Article
Full-text available
Control of soot emission raises fundamental issues and has important practical implications requiring a full understanding of soot production and oxidation processes. The research reported in the present paper intends to contribute to the studies carried out within the frame of the International Sooting Flame workshop (ISF) on laminar sooting flame...
Conference Paper
This work aims at presenting a novel approach to measure planar velocity in gas turbine combustors at very high sampling frequencies. For this purpose, a continuous wave laser is used in order to illuminate particles that are seeded into the flow. The Mie scattering images are acquired with a high-speed camera at 100 kHz with a constant time betwee...
Article
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This paper describes a joint experimental and numerical investigation of the interaction between thermoacoustics and flashback mechanisms in a swirled turbulent burner. An academic air/propane combustor terminated by a choked nozzle is operated up to 2.5 bars. Experiments show that the flame can stabilize either within the combustion chamber or fla...
Conference Paper
In 2014, Mario Molina Center performed a study concerning air pollutants in Asunción. The results showed that population of Asunción is exposed to high levels of air pollution particles (ranging between 2.5 and 10 microns) and nitrogen dioxide that threatens their health. In addition, the study showed that transport has an important role in this pr...
Article
Experimental and numerical investigations of the combustion of a methane/air mixture fed with coal particles are performed. The retained configuration is a laminar 1-D strained flame impinging a wall. The wall surface promotes the formation of a methane/air flame front parallel to the stagnation plane. Coal particles oxidation takes place in the ho...
Conference Paper
Combustors are contributing to the core noise emission of aero-engines in terms of direct and indirect combustion noise. The first is caused by the unsteady heat release rate, the second by the acceleration of inflow inhomogeneities, such as entropy fluctuations, at the combustor outlet or in the turbine. This work aims to investigate combustion no...
Article
Full-text available
For a long time, engine noise has been dominated by fan and jet noise. With their reduction for modern turbojets, for instance, combustion noise is no longer negligible and efforts are concentrated on its understanding. The objective of the European project RECORD is to help to understand the fundamental mechanisms of core noise, in order to reduce...
Article
Partial oxidation and non-catalytic steam reforming of methane is studied by conducting an experimental and numerical analysis of reactions taking place in the post-flame region of a generic laminar atmospheric burner operated at fuel-rich conditions. Laminar planar premixed methane/oxygen/nitrogen (CH4/O2/N2) flames are stabilized above a porous m...
Article
Non-Photochemical Laser-Induced Nucleation (NPLIN) is an original and promising nucleation method, which has been applied with success to small-molecule organic compounds, proteins and inorganic compounds, leading to almost 50 publications. After first application of NPLIN to glycine and carbamazepine, our team has performed NPLIN experiments on su...
Conference Paper
Diesel is a complex real fuel, which is derived from conventional petroleum sources, and is composed of hundreds of compounds. These characteristics indicate the difficulty of using this fuel for numerical studies. In order to avoid these difficulties, simplified synthetic fuels, called "surrogate fuels" are used. On the other hand, biodiesel is a...
Conference Paper
Full-text available
Gasoline is a complex real fuel, with a wide variation in composition between commercial gasolines. These characteristics indicate the difficulty of using this fuel for numerical studies. In order to avoid these difficulties, simplified synthetic fuels, called "surrogate fuels" are used. On the other hand, ethanol is a renewable, biodegradable, non...
Article
Full-text available
This paper reports on an experimental study of the influence of a nanosecond repetitively pulsed spark discharge on the stability domain of a propane/air flame. This flame is produced in a lean premixed swirled combustor representative of an aeronautical combustion chamber. The lean extinction limits of the flame produced without and with plasma ar...
Article
Biodiesel is a mixture of long chain fatty acids such as methyl esters and is mainly used in diesel engines. Its fundamental properties and combustion pathways still need to be analyzed and validated. The present study concerns the creation and development of new data for the combustion of rapeseed methyl ester biodiesel (RME) and methyl decanoate...
Conference Paper
Combustion is now considered as a non-negligible contributor to gas turbine noise. Combustion noise can be divided into two types: direct combustion noise directly caused by flame surface fluctuations and indirect combustion noise caused by non-homogeneities in the burnt gases, which radiate sound when interacting with the first turbine stages. The...
Conference Paper
In a swirl-stabilised liquid fuel burner, the fuel spray response to the Precessing Vortex Core (PVC) and air flow rate modulations is analysed in non-reacting conditions. A siren-like device is used to modulate the air flow rate at a frequency corresponding to longitudinal combustion instability oscillations observed during reacting tests. Time-re...
Conference Paper
Full-text available
The objective of this work is to understand the development and optimization of flex fuel engines. It focuses on the creation of a new database for the combustion of spray ethanol conveyed by air and stabilized by a methane/air flame. The experimental work is realized in a laminar strained flow configuration. A methane/air mixture is injected throu...
Article
Full-text available
Non-photochemical laser-induced nucleation (NPLIN) has been a growing field of study since 1996, and more than 40 compounds including organics, inorganics and proteins have now been probed under various conditions (solvents, laser types, laser beams etc. ). The potential advantages of using this technique are significant, in particular polymorphic...
Article
Soot control raises important fundamental issues and industrial challenges, which require a comprehensive understanding of processes governing its formation, interactions and destruction in turbulent flames. A physical insight of the soot space–time evolution in a turbulent diffusion flame is reported in this article by combining three simultaneous...
Article
A laboratory-scale two-stage swirling burner fueled with dodecane is studied experimentally with the help of high speed (20 kHz) spray PIV and chemiluminescence imaging. For a lean operating point at 73 kW, fuel staging is changed and a hysteresis cycle is highlighted. The flame is first lifted from the injector exit plane and exhibits a strong the...
Article
This paper reports for the first time the crystallization of the carbamazepine (CBZ) molecule in two solvents (methanol and acetonitrile) using the non-photochemical laser-induced nucleation (NPLIN) technique. The metastable zone of CBZ is first determined experimentally for different temperatures in both solvents. Then, the prepared solutions are...
Article
Shape transitions of swirling flames are often observed in combustion chambers operated at steady flow injection conditions. These transitions may alter pollutant emissions, heat fluxes to the chamber walls or the system stability. In adiabatic combustors, transitions between V and M shapes of swirling flames are controlled by the dynamics of stret...
Conference Paper
Biodiesel is a mixture of long chain fatty acid methyl esters used mainly in compression ignition engines. In order to improve engine performance, an understanding of its fundamental properties and the combustion pathways is required. This study presents new data for biodiesel (rapeseed methyl ester, RME) combustion in a laminar counterflow premixe...
Conference Paper
This work study the influence of the light refraction in the apparent broadening of species experimental profiles in counterflow premixed flames. In fact, in a counterflow premixed flame, is generated a layered medium by the temperature gradient which induces a change in the milieu refractive index, causing a deviation of rays emitted by each point...
Conference Paper
Full-text available
Biodiesel is a mixture of long chain fatty acid methyl esters used mainly in compression ignition engines. In order to improve engine performance, an understanding of its fundamental properties and the combustion pathways is required. A surrogate fuel: methyl decanoate (MD) is used in order to simplify the models and experiments. This study present...
Article
The present investigation is focused on high-frequency combustion instabilities coupled by transverse acoustic modes. This phenomenon has been observed during the development of many liquid rocket engines and other high performance devices. Such instabilities induce an unsteady heat release which leads in many cases to a rapid intensification of he...
Article
Full-text available
Burners operating in lean premixed prevaporized (LPP) regimes are considered as good candidates to reduce pollutant emissions from gas turbines. Lean combustion regimes result in lower burnt gas temperatures and therefore a reduction on the NOx emissions, one of the main pollutant species. However, these burners usually show strong flame dynamics,...
Conference Paper
In this work we propose to study the combustion of biodiesel (rapeseed and soybean) using a diagnostic technique based on spontaneous flame emission, resolved spatially and spectrally through interference filters and a OMA spectrometer, which provides information about the spectral intensity of active species. The Laser Doppler Velocimetry was used...
Conference Paper
Staged multi-injection combustors seem good candidates to face flame stabilization problems (combustion instabilities, flashback, flame extinction), encountered in lean premixed prevaporized (LPP) burners. Staging procedures enable fuel distribution control while multipoint injection can lead to a fast and efficient mixing. In the present study, a...
Conference Paper
Burners operating in lean premixed prevaporized (LPP) regimes are considered as good candidates to reduce pollutant emissions from gas turbines. Lean combustion regimes result in lower burnt gas temperatures and therefore a reduction on the NOx emissions, one of the main pollutant species. However, these burners usually show strong flame dynamics,...
Article
Full-text available
Lean premixed prevaporized burners seem good candidates to reduce pollutant emissions from gas turbines. Indeed, lean combustion regimes result in lower temperatures and therefore a reduction on the NOx emissions, major pollutant species. However, these burners are very sensitive to combustion instabilities (flashback, flame extinction or pressure...
Article
The present work details the analysis of staging and multipoint injection effects on the flow field, flame structure and acoustic properties of a lean swirled injector, representative of a gas turbine burner. The study is carried out for a constant power and global equivalence ratio while the staging parameter a between pilot and multipoint stages...
Article
High frequency combustion instabilities have technical importance in the design of liquid rocket engines. These phenomena involve a strong coupling between transverse acoustic modes and combustion. They are currently being investigated by combining experimentation and numerical simulations. On the experimental level, the coupling is examined in a m...
Article
This article considers the influence of fluctuations in temperature on acoustic resonance characteristics of a combustion chamber. This analysis is concerned with acoustic coupling experienced in high frequency instabilities. Experiments carried out on a multiple injector combustor (MIC) operating with liquid oxygen and gaseous methane are used to...
Article
Full-text available
The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of gas turbine combustors. This analysis is carried out using High Frequency PIV (HFPIV) measurements in a reactive situation. While this information is usually available at a rather low rate, temporally resolved PIV measurements are...
Article
High-frequency instabilities in liquid propellant rocket engines are experimentally investigated in a model scale research facility. Liquid oxygen and gaseous methane are injected in the combustion chamber at 0.9 MPa through three coaxial injectors vertically aligned. High-amplitude transverse pressure fluctuations are generated in the chamber at f...
Article
Full-text available
The present work details the analysis of the aerodynamics of an experimental swirl stabilized burner representative of a gas turbine combustor. This study has been performed using a High frequency PIV (HFPIV) system working at a high acquisition rate (12 kHz). For the last 25 years, Particle Imaging Velocimetry has been developed and improved so th...