Academic literature on the topic 'Moteur fusée cryotechnique'
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Journal articles on the topic "Moteur fusée cryotechnique":
Moraux, J. Y., D. Girodin, and J. M. de Monicault. "Choix et évolution des matériaux dans les roulements de turbopompe cryotechnique de moteur fusée." Matériaux & Techniques 89, no. 1-2 (2001): 15–20. http://dx.doi.org/10.1051/mattech/200189010015.
Guichard, D. "Sélection des matériaux pour les rouets centrifuges cryotechniques de moteurs de fusée." Revue de Métallurgie 93, no. 12 (December 1996): 1501–7. http://dx.doi.org/10.1051/metal/199693121501.
Dissertations / Theses on the topic "Moteur fusée cryotechnique":
Rocchi, Jean-Philippe. "Simulations aux grandes échelles de la phase d'allumage dans un moteur fusée cryotechnique." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/14667/1/rocchi.pdf.
Bodèle, Emmanuel. "Modélisation et simulation de l'atomisation secondaire et de la vaporisation turbulente : application à la combustion cryotechnique." Phd thesis, Université d'Orléans, 2004. http://tel.archives-ouvertes.fr/tel-00283103.
Ces modèles sont issus d'études expérimentales précédentes du LCSR, ayant permis d'établir des bases de données.
Les calculs sont basés sur la simulation du banc d'essai MASCOTTE (Montage Autonome Simplifié pour la Cryocombustion dans l'Oxygène et Toutes Techniques Expérimentales) de l'ONERA. Les résultats montrent d'une part l'influence de l'atomisation sur la structure du brouillard et de la flamme. D'autre part, les simulations de la vaporisation turbulente mettent en évidence l'influence de la turbulence sur les propriétés des gouttes.
Dauptain, Antoine. "Allumage des moteurs fusées cryotechniques." Toulouse, INPT, 2006. http://ethesis.inp-toulouse.fr/archive/00000343/.
Today, space launchers require cryotechnic rocket engines able to reignite during flight. The ignition phases in flight conditions are particularly critical and the development of restartable engines needs accurate and reliable tools. The present thesis develops a Large Eddy Simulation (LES) for the study of unsteady supersonic reactive flows. Several aspects are treated : chemical kinetics, auto-ignition and differential diffusion, numerical methods suited to supersonic flows and their discontinuities, combustion. Comparisons with experimental data on academic test cases validate the models, and give detailed insights into the auto-ignition process. Based on these achievements, LES of industrial configurations may be now envisaged, allowing the study of unsteady ignition regimes and the optimization of devices
Gonzalez, Flesca Manuel. "Contributions en simulation, expérimentation et modélisation destinées à l’analyse des instabilités de combustion hautes fréquences des moteurs fusées à ergols liquides." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC088/document.
This research concerns some of the issues raised by high frequency combustion instabilities in rocket engines. These instabilities are known to have detrimental effects leading, in some cases, to the destruction of the propulsion system. To avoid the appearance of such instabilities it is important to gain an understanding of the processes driving such dynamical phenomena. One has to consider the complex coupling between injection, combustion and the acoustic resonances of the system. The present work contributes to this objective by developing three items.The first deals with numerical simulations of non-reactive and reactive jets submitted to different modulation conditions to understand the interaction between jets, flames and their environment. Numerical simulations of non-reactive round jets as well as more complex flames formed by coaxial injectors operating under transcritical conditions were carried out using large eddy simulation (LES) adapted to real gas situations by making use of the AVBP-RG flow solver. Round jets were submitted to transverse velocity fluctuations. It has been found that for all amplitudes and frequencies of modulation, the modulated jet is deformed and oscillates. This behavior can be represented by a model. The coaxial flames were submitted to mass flow rate and pressure modulation. For these cases it has been found that the modulation induces variations of the global heat release rate. A mathematical relationship between the modulated parameters and the heat release rate has been proposed.The second item includes experimental investigations. For this purpose a New Pressurized Coupled Cavities (NPCC) laboratory test rig has been developed. The possible coupling between the plenum and the thrust chamber was studied. A model, linking pressure and velocity fluctuations between the plenum and the thrust chamber, has been developed. The laboratory test rig was also used to gather some knowledge on the levels of damping and the damping coefficients could be determined.The last item of this document deals with the development of a reduced order dynamical model which includes some of the driving and damping mechanisms of high frequency combustion instabilities. This dynamical description was implemented in a high frequency stability code (STAHF). This code was used to examine a 87 MW liquid rocket engine (BKD operated at DLR, Germany) exhibiting high frequency oscillations. After the adjustment of some control parameters, STAHF was able to retrieve some the features observed in experiments carried out at DLR
Lechner, Valentin. "Experimental study of LOX/CH4 flames in rocket engines." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST040.
Using methane as a fuel in rocket engines would have many advantages but the combustion with pure oxygen at high pressure remains poorly understood. From a thermodynamic point of view, methane and oxygen share very similar critical point values, making it challenging to predict propellant mixing, flame anchoring, stability and structure. Moreover, when methane is injected in excess, aerosols can be produced, which can clog the lines, damage the turbine, and reduce the efficiency.Therefore, a thorough update of the knowledge of LOX/CH4 combustion is necessary. These challenges are tackled within the consortium composed of EM2C laboratory, ONERA, CNES, and ArianeGroup. Two test campaigns are carried out at the MASCOTTE facility from ONERA, aiming to study three central topics: the flame structure, wall heat transfers, and aerosol production. To this end, various experimental diagnostics are implemented simultaneously during high-pressure hot-fire tests.Various imaging diagnostics are implemented to analyze the flame structure and the dense liquid jets. Despite the acquisition difficulties encountered in these extreme conditions, the analyses reveal a complex flame structure. In the subcritical regime, atomization and evaporation mechanisms dominate. The flame is much more opened and longer than at higher pressures, where diffusive mixing mechanisms prevail. Characterizing flame anchoring remains a challenge. A water ice ring surrounding, and masking, the flame foot has been identified. Formation mechanisms are proposed, and a growth/destruction temporal cycle is highlighted. Its presence strongly affects flame visualizations, and may lead to misinterpretations of its topology.Laser-induced phosphorescence (LIP) is implemented for the first time at MASCOTTE. Various LIP methods exist, but they are not well suited to the MASCOTTE conditions: wide temperature range, thermal transients, and two-phase flow environment favoring laser absorption/diffusion. Therefore, a specific method, the Full Spectrum Fitting method (FSF method), has been developed. It exploits the spectral dependence on temperature, enabling instantaneous measurements from 100 to 900 K with a precision of 17 K, with no dependence on the laser excitation energy. A detailed data analysis highlights the predominant wall heat transfer modes, studies the influence of the operating points, and compares the experimental data with a wall heat transfer model, which is particularly well suited for deducing the convective properties of the flow.Three diagnostics are used to characterize aerosols. An intrusive probe samples particles and burnt gases downstream of the flame. The particles are sampled on TEM grids and analyzed by Transmission Electron Microscopy. Detailed images of the aerosol morphology reveal that the particles are soot. Combustion products are analyzed by gas chromatography. This makes it possible to identify soot precursor molecules such as benzene and acetylene. Soot are quantified temporally by laser extinction. A dedicated post-processing method is developed and various hypotheses are discussed to explain the spatial variations of the soot production downstream of the flame
Schreiber, Didier. "Quelques problèmes de combustion lies à l'allumage dans les moteurs fusée cryotechniques." Châtenay-Malabry, Ecole centrale de Paris, 1991. http://www.theses.fr/1991ECAP0204.
Lacaze, Guilhem. "Simulation aux Grandes Echelles de l'allumage de moteurs fusées cryotechniques." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2009. http://tel.archives-ouvertes.fr/tel-00429666.
Lacas, François. "Modélisation et simulation numérique de la combustion turbulente dans les moteurs fusée cryotechniques." Châtenay-Malabry, Ecole centrale de Paris, 1989. http://www.theses.fr/1989ECAP0095.
Fichot, Florian. "Modélisation de l'allumage d'une flamme de diffusion turbulente : application aux moteurs-fusées cryotechniques." Châtenay-Malabry, Ecole centrale de Paris, 1994. http://www.theses.fr/1994ECAP0349.
Juniper, Matthew. "Structure et stabilisation des flammes cryotechniques." Châtenay-Malabry, Ecole centrale de Paris, 2001. http://www.theses.fr/2001ECAP0728.