Добірка наукової літератури з теми "Contrôle adptatif de l'écoulement"
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Статті в журналах з теми "Contrôle adptatif de l'écoulement":
BenChiekh, Maher, Jean-Christophe Bera, Marc Michard, and Michel Sunyach. "Contrôle par jet pulsé de l'écoulement dans un divergent court à grand angle." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 328, no. 10 (October 2000): 749–56. http://dx.doi.org/10.1016/s1620-7742(00)01244-7.
Zella, L., A. Kettab, and G. Chasseriaux. "Modélisation des réseaux de microirrigation." Revue des sciences de l'eau 17, no. 1 (April 12, 2005): 49–68. http://dx.doi.org/10.7202/705522ar.
Fournier, Guillaume, Stéphanie Pellerin, and Loc Ta Phuoc. "Contrôle par rotation ou par aspiration de l'écoulement autour d'un cylindre calculé par Simulation des Grandes Échelles." Comptes Rendus Mécanique 333, no. 3 (March 2005): 273–78. http://dx.doi.org/10.1016/j.crme.2004.11.001.
Sow, P. S., T. S. N'Gueye, E. Sy, L. Toure, C. Ba, and M. Badiane. "Les médicaments du marché parallèle pour le traitement de l'écoulement urétral à Dakar: Enquête épidémiologique et contrôle physicochimique." Médecine et Maladies Infectieuses 29, no. 8 (August 1999): 532–36. http://dx.doi.org/10.1016/s0399-077x(99)80099-7.
Дисертації з теми "Contrôle adptatif de l'écoulement":
Cembalo, Agostino. "Stratégie innovante d'optimisation de la traînée aérodynamique en temps réel pour l'amélioration de l'efficacité énergétique des voitures." Electronic Thesis or Diss., Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2024. http://www.theses.fr/2024ESMA0007.
The reduction of CO2 emissions and environmental footprint represents a major challenge for the automotive industry in the 21st century, with approximately 72% of greenhouse gas emissions in the European transportation sector attributed to road transport. To address this issue, automotive manufacturers are increasingly focusing on reducing the environmental footprint of their vehicles and minimizing energy consumption. In this context, car aerodynamics plays a crucial role. This study therefore explores the challenges and opportunities associated with real-time control of vehicle’s wakes using a Predictive Control with Recursive model estimation based on a Subspace method (RSPC). We first characterize the wake of a full-scale vehicle, both in wind tunnel and on-road. The results highlight the importance of low-frequency phenomenons and quasi-static wake movements. Subsequently, we implement a control methodology aimed at regulating the angular positions of rigid flaps located at the base of the studied models to maintain a prescribed base pressure state. Among the significant results, we note that the control law succeeds in achieving defined objectives under varied conditions, including variations in yaw angle and disturbances in the underflow through the use of a movable grid placed upstream of the vehicle. The observed benefits in terms of aerodynamic drag are remarkable and model-dependent, while maintaining relatively low energy consumption. The latter varies between 0.35% and 0.6% of the dissipated aerodynamic power. In conclusion,this study opens new perspectives for vehicle aerodynamic control, offering significant opportunities for energy consumption reduction and, consequently, greenhouse gas emissions. It thus aim to mitigating the effects of climate change
Renac, Florent. "Contrôle expérimental de l'écoulement tourbillonnaire sur une aile delta." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00119173.
Morgand, S. "Caractérisation et contrôle de l'écoulement autour d'un UCAV générique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-01018713.
Levy, Benjamin. "Analyse et contrôle de l'écoulement de montant de baie." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/2371/.
The work presented in this document is related to the research theme of car aerodynamic. Although at the present time the automobile industry is mainly looking at the drag reduction of a vehicle, there are other research areas in automotive aerodynamic. One of them is aeroacoustics, the study of the aerodynamic phenomena that can lead directly or indirectly to acoustic disturbances, ie noise. In this thesis, the aeroacoustic of the A-pillar (the part situated between the windscreen and side window) was experimentally studied in a wind tunnel and on a track, by PIV measurements, pressure sensor, hot wire, etc. In a second phase, passive control techniques have been studied in a wind tunnel, and prototypes were made to be tested on a road vehicle
Morgand, Stéphane. "Caractérisation et contrôle de l'écoulement autour d'un UCAV générique." Paris 6, 2013. http://www.theses.fr/2013PA066787.
This thesis is a contribution to the understanding of the vortical flow in connection with the non-linear aerodynamic behavior of the UCAV SACCON configuration, 53° sweep angle with spanwise variation of leading-edge. Experimental wind tunnel tests were performed on a model to characterize the complex vortical flow field causes the pitch down/up and roll/yawing instabilities due to its asymmetric occurrence. Unsteady vortical substructures emanating from the leading edge and convected in the mixing layer were detected by criterion in stereoscopic PIV measurements. Comparison of these measurements with numerical investigations reveals that simulations predict the overall behavior of the aircraft. The second part of the work has been devoted to increase aerodynamic performances of the UCAV by means of some control strategies. Experimental measurements and numerical simulations confirmed that the implementation of flow control devices at leading edge changed the topology of vortical flow field and contributed to improve the behavior of the UCAV
Illy, Hervé. "Contrôle de l'écoulement au-dessus d'une cavité en régime transsonique." Ecully, Ecole centrale de Lyon, 2005. http://bibli.ec-lyon.fr/exl-doc/hilly.pdf.
The impingement of a flow upon a wall results in a sound that industrials want to remove because the level of acoustic energy, although it represents only a weak part of the total energy, may affect the material integrity or cause a prejudicial noise pollution. In particular, suppression of the low frequency narrow-band sound (discrete tones) of high amplitude produced by the flow over a cavity is an important challenge, as shown y the numerous studies dedicated to this subject over the last six decades. This study aims at controlling or suppressing the self-sustained oscillations responsible for the generation of acoustic waves in this flow. However, despite the apparent simplicity of the phenomena, knowledge of the physical mechanisms involved remains limites, making the control approach still difficult to carry out. As control is dependent on the knowledge of the physics of the flow, the influence of the upstream conditions in highly subsonic flows as been investigated. A local aspiration of the boundary layer is carried out by a narrow split upstream of the cavity. Unsteady pressure measurements show that, over the range of parameters under consideration, the diminution of the boundary layer thickness does not induce any significant change in the flow
El, Hassan Mouhammad. "Analyse et contrôle de l'écoulement turbulent affleurant une cavité profonde." Valenciennes, 2008. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/2e18b443-d1f3-475e-819b-4c3a7c3dc7e3.
Deep cavities are present in many industrial processes. The aero-acoustic coupling and the high increase in the skin friction coefficient downstream from the cavity results in resonance of high pressure level as well as strong vibration and structural fatigue. The present experimental investigation shows the effect of a deep cavity on a turbulent boundary layer. A control device using spanwise cylinder is conducted. LDV measurements, conducted in a water tunnel, evidenced that the skin friction coefficient increases downstream from the cavity. With same flow conditions, drag increase is lower for deep cavities than for shallow ones studied in the literature. The high values of skewness and flatness coefficients are related to intermittent ejections of flow from the downstream part of the cavity. This hypothesis was confirmed thanks to PIV measurements. Pressure measurements are conducted in two large deep cavity configurations (L/H = 0. 2 et 0. 41) in a large wind tunnel. Oscillations of discrete frequencies are produced inside the cavity when the free-stream velocity becomes higher than a minimum value which depends on the cavity length L. The hydrodynamic mode of the cavity shear layer is well predicted by the Rossiter model the convection velocity is measured and when the empirical time delay is neglected. Time-resolved PIV measurements show that for L/H = 0. 2 and U₀ = 43 m/s only one vortical structure is formed at the cavity leading edge. This vortex grows while convecting downstream along the shear layer. A cylinder placed spanwisely near the cavity leading edge removes the resonance and highly modifies the behavior of the shear layer flow. Reductions in sound pressure levels (SPL) of up to 36 dB is obtained for optimal position of 1. 67 diameter of the cylinder from the wall. Moreover, a shaped cylinder was also studied and shows that the attenuation of tones is not due to high frequency pulsing as suggested in literature, but to higher stability of the shear layer due to the change in the mean axial velocity profiles and the increase in the shear layer thickness
Douay, Christelle. "Etude expérimentale paramétrique des propriétés et transitions de l'écoulement intra-cavitaire en cavité ouverte et contrôle de l'écoulement." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066168/document.
This work is devoted to the characterization of the dynamic inside an open cavity flow, for which few experimental studies exist. A control of the flow has been also investigated. We have performed a parametric study of the first and second regime of the flow for which Taylor-Görtler vortices type appear. Bifurcation thresholds have been identified and their systematic supercritical nature has been highlighted. We have also showed that different family of propagating or stationary modes can be selected depending on the geometry of the cavity. This has confirmed predictions obtained by linear stability analysis of the base flow in the literature. We have showed that the second regime results from the superposition of left and right propagating waves. We attended to identify coefficients of the complex coupled Ginzburg-Landau equations that describe the dynamics but the values of the coefficients are sensitive to multiple parameters. A control of oscillations of the shear layer has been achieved by the mean of a plasma actuator with dielectric barrier discharge located upstream of the cavity. Locked regimes have been identified by the analysis of the flow response to a periodic perturbation with different amplitude. Finally, we have performed a closed loop control of the oscillations of the shear layer using a delay feedback control law proposed by Pyragas in the context of chaotic dynamical systems
Deveaux, Benjamin. "Analyse et contrôle de l'écoulement de jeu d'une aube fixe isolée." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE009.
This study aims at providing a detailed description of the tip-leakage flow, in order to analyzeits sensitivity to design parameters and to control devices based on air injection from the casing. The setup iscomposed of a single blade, set orthogonal to a flat plate that plays the role of the casing wall. The analysis isbased on experiments conducted in a low-speed wind tunnel that are complemented by CFD calculations. Thetip-leakage flow is primarily driven by the gap height. The incoming boundary layer thickness and the bladeloading also have a notable effect on the lateral position of the tip-leakage vortex. The distribution of local entropycreation rate has been used to identify areas of losses in the flow. Moreover, the total pressure losses have beendecomposed in two terms identified as a vortex loss and a wake loss. This vortex loss drives the increase of totalpressure losses with the gap height. An empirical model has been developped to predict the evolution of thetip-leakage vortex circulation and of the total pressure losses with respect to the gap height. A steady injection ofair from the casing has been evaluated, using normal jets in the gap. With this control strategy, the tip-leakagevortex tends to be closer to the blade, which could lead to an extension of the range of stable operation for axialcompressors. In addition to that, the control device smoothes out the axial vorticity field in the tip-leakage vortex,which could be interesting to reduce rotor-stator interactions. However, this control strategy leads to higher totalpressure losses and is less effective with larger gaps
Fourrié, Grégoire. "Caractérisation pariétale instationnaire et contrôle de l'écoulement autour d'un corps épais." Valenciennes, 2011. http://ged.univ-valenciennes.fr/nuxeo/site/esupversions/386b2c0b-a910-4e2b-af9d-aaa9b93e38f6.
To be efficient, strategies aiming at reducing automotive vehicles aerodynamic drag have to be based on an increased knowledge of the physical phenomena present in the flow around the vehicle. This experimental work intends to contribute to the understanding of these phenomena by focusing on the flow around a generic vehicle model, the Ahmed body. This flow is characterized by the development of a recirculation bubble surrounded by two longitudinal vortex structures in the immediate neighborhood of the model rear window. At first, this flow is studied by polarographic method in a water tunnel, this method permits the unsteady wall shear stress measurement. This physical quantity is particularly sensitive to the presence of coherent structures in the near-wall region. By the use of different analysis methods, we highlight the presence of marked unsteadinesses in the flow strongly participating in the complex dynamics of the vortex structures. A flow control using a deflector is then studied. The increase in the separated bubble on the rear window by the device allows, under certain conditions, a drag reduction of about 9%. We focus on the understanding of the physical mechanisms involved in this modification of the aerodynamic stresses, in particular by characterizing the influence of the control on the flow topology. The modification of the balance existing between the separated zone on the window and the longitudinal vortex structures developing at its contact allows the decrease in their contribution to the aerodynamic drag. We show that the increase imposed in the recirculation bubbles allows the weakening, then the destruction, of the longitudinal vortices. This study shows that it is necessary to take all the vortex structures into account around this kind of three-dimensional configuration in order to design more efficient flow control strategies