Добірка наукової літератури з теми "Bruit – Combustion"
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Статті в журналах з теми "Bruit – Combustion":
Siron, R., E. Pelletier, and C. Brochu. "Suivi d’une contamination pétrolière accidentelle dans l’estuaire moyen du Saint-Laurent: Le cas de l’Ile-aux-Grues." Water Quality Research Journal 26, no. 1 (February 1, 1991): 61–86. http://dx.doi.org/10.2166/wqrj.1991.005.
Azri, Chafai, Ali Tili, Mohamed Moncef Serbaji, and Khaled Medhioub. "Etude des résidus de combustion des fuels liquide et solide et de traitement chimique du phosphate brut dans la ville de Sfax (Tunisie)." Pollution atmosphérique, N°174 (2002). http://dx.doi.org/10.4267/pollution-atmospherique.2479.
Дисертації з теми "Bruit – Combustion":
Gentil, Yann. "Modélisation du bruit de combustion." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP007.
Combustion noise in turboshaft engines is becoming one of the main sources of aircraft noise, thanks to successive improvements aimed at reducing jet noise, fuel consumption and nitrogen dioxide generation. New-generation turboshaft engines are thus characterized by a more compact size (with fewer turbine stages) and more intense thermo-acoustic activity. Two mechanisms are responsible for combustion noise: direct noise from acoustic waves generated by the flame, and indirect noise from the acceleration and deceleration of non-acoustic fluctuations in the turbine stages. In this context, it is essential for the design of these engines to rely on a calculation methodology enabling the prediction of combustion noise and these two main generating mechanisms. To this end, CERFACS has been working for several years on the development of a calculation methodology based on large-scale simulation (LSS) of combustion chambers, coupled with an analytical method for propagating noise in the turbine stages.This thesis focused on the analytical models describing noise generation in nozzles (simplified turbine domain) and their validation by accurate unsteady numerical simulations. The model used to predict indirect noise due to composition fluctuations has been revisited and validated using simulations requiring the development of new non-reflecting conditions. This model was then extended to take into account temperature-dependent variations in the heat capacities of the species in the flow. Its impact on noise generation mechanisms is assessed using parametric studies. Finally, noise generation in turbines has been studied both theoretically and in an applicative way. On the one hand, after proposing a reduced analytical model describing 1D wave propagation at zero frequencies, this model is extended to all frequencies and compared with unsteady results in a stator. The propagation of 2D entropic waves in a stator and a nozzle is then performed and analyzed. On the other hand, the complete combustion noise calculation methodology, called CONOCHAIN, is applied on the basis of two-phase numerical simulation results for the TEENI helicopter engine as part of the CIRRUS project. Combustion noise levels are analyzed and compared at turbine outlet and far-field with previous experimental and numerical results
Livebardon, Thomas. "Modélisation du bruit de combustion dans les turbines d'hélicoptères." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0143/document.
The growth of air traffic at the vicinity of areas at high population density imposes to make quieter aircrafts on aeronautical manufacturers.The engine noise is one of the major contributors to the overall sound levels. Furthermore, the combustion is known to be responsible for a broadband noise generation at low-frequency. The combustion noise can be put into two main mechanisms. The first one is the emission of sound pulses by the unsteady heat release of the combustion process and is called the direct combustion noise. The second one is the generation of acoustic waves within the turbine stages by the acceleration of the temperature inhomogeneities and vorticity waves induced by the combustion and the turbulent flow within the combustor. This noise is the indirect combustion noise. These mechanisms were fully investigated in academic cases using experimental, analytical and numerical approaches contrary to the combustion noise within real engines. In this work, a hybrid approach called CONOCHAIN and based on LES of combustion chamber and an analytical disk theory to compute the combustion noise in a real turboshaft engine is evaluated. The predicted noise levels are compared with the experimental results obtained from a TURBOMECA engine in the framework of TEENI project (European project FP7) and analysed in this work where a turboshaft engine was instrumented to locate and identify the broadband noise sources. Two LES of a single sector of the TEENI combustion chamber representative of two experimental operating points are performed as well as a LES of the full-scale combustor at high power. The unsteady fields provided by the LES are used to compute direct and indirect combustion noise within the turbine stages in both cases and compared with the experimental results
Mazur, Marek. "Etude expérimentale du bruit de combustion dans un foyer de type aéronautique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLC034/document.
Combustion noise has become an increasing contributor of overall aircraft engine noise. It consists of two major parts, direct and indirect combustion noise. The former is generated by the heat release fluctuations of the flame itself. The latter is generated by the temperature inhomogeneities in the burnt gases, which are accelerated in the turbine stages or nozzle following the combustion chamber.The aim of this work is to design and build a pressurized lean swirling combustor test bench, in order to quantify the two contributions.The combustor is thus supposed to generate high quantities of indirect combustion noise. The second aim is then to determine the contributions of direct and indirect combustion noise quantitatively and to gain insight about the sources of the two contributions. These analyses are conducted by different high-speed diagnostics, which were worked on during this work. These diagnostics allow to characterize the flow fields and flame dynamics, to put forward the combustion instability in the system and finally to quantify the direct and indirect combustion noise contributions
Porta, Mauro Poinsot Thierry. "Développement, vérification des outils LES pour l'étude du bruit de combustion et de l'interaction combustion / acoustique / turbulence." Toulouse : INP Toulouse, 2008. http://ethesis.inp-toulouse.fr/archive/00000507.
Tao, Wenjie. "Time resolved temperature and pressure based methodology for direct and indirect combustion noise separation." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLC009/document.
The objective of the thesis is the development of a practical strategy to quantify experimentally indirect noise and to discriminate it from direct noise as they co-exist in most practical conditions. The configuration retained for the study is a test bench with a nozzle and the proposed the strategy relies on nozzle transfer functions. The first chapter defines the nozzle transfer functions used in the study as references for the validation of the strategy. The second chapter introduces an original setup that generates simultaneously direct and indirect noise without handling combustion. The third chapter details the methods to evaluate the acoustic and entropy waves from raw temperature and pressure signals. The fourth chapter closes the first part of the study by describing the strategy then testing it on high-fidelity simulation and experimental signals. The second part focuses on the use of the strategy in Large Eddy Simulations of a turbulent combustion test bench. Simulations are validated by experimental data then raw signals are processed to quantify the direct and indirect noise sources as well as the direct and indirect noise contributions
Porta, Mauro. "Développement, vérification des outils LES pour l'étude du bruit de combustion et de l'interaction combustion / acoustique / turbulence." Toulouse, INPT, 2007. http://ethesis.inp-toulouse.fr/archive/00000507/.
This work is about the Large Eddy Simulation (LES) of combustion instabilities in industrial burners and, in particular, the assessment of the quality of the results that can be obtained with this approach. The ability of the LES code AVBP of CERFACS to accurately compute simple configurations involving only one physical phenomenon (turbulence, acoustics or combustion) is firstly verified. Reactive and non-reactive academical test cases, for which the analytical solutions are known, are presented putting special emphasis on the influence of the numerical discretization and on its interaction with boundary conditions. Then, having gained confidence in the LES tool, the results obtained from a self-excited computation of a lab-scale burner are shown
Duran, Garcia-Rama Ignacio Luis. "Prediction of combustion noise in modern aero engines combining large eddy simulations and analytical methods." Thesis, Toulouse, INPT, 2013. http://www.theses.fr/2013INPT0138.
Combustion noise is increasing its relative contribution to aircraft noise, while other sources are being reduced and new low-NOx emission combustion chambers being built. Two mechanisms are responsible for this noise source: direct noise in which acoustic waves are generated by the flame and propagate to the outlet of the aero-engine, and indirect noise, where entropy waves generate noise as they are accelerated and decelerated in the turbine stages. In this work the analytical models used for the propagation of waves through non-homogeneous flows, including the generation of indirect noise, are revised and extended. In the first part, the quasi-1D case is studied, extending the analytical method to non-zero frequencies and validating the results with numerical methods and experimental data. In the second part, the 2D method for the case of compact turbine blades is studied and validated using numerical simulations of a rotating blade and of a complete turbine stage. Finally, in the third part of this thesis, these models are combined with reactive and compressible Large Eddy Simulations (LES) of combustion chambers to build a hybrid approach, named CHORUS, able to predict combustion noise
Pruvost, L. "Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre." Phd thesis, INSA de Lyon, 2009. http://tel.archives-ouvertes.fr/tel-00429987.
Pruvost, Laurent. "Extraction du bruit de combustion d'un moteur Diesel. Développement et application d'un spectrofiltre." Lyon, INSA, 2009. http://theses.insa-lyon.fr/publication/2009ISAL0054/these.pdf.
This PhD dissertation tackles the validation and application of a spectrofilter to separate the combustion and mechanical noises of a diesel engine. The spectrofilter is a transfer function estimate. In the present study's context, it estimates the vibroacoustic transfers of the combustion forces from the engine's cylinders to the listening spot. The spectrofilter is computed upon the in-cylinder pressure and engine noise signals. The method under study is an application of the cyclostationnarity theory. It consists in computing the spectrofilter upon the non-deterministic part of the signals. The point of this method is to reduce the error stemming from the correlation between combustion and mechanical sources. First, this method is argued on a theoretical basis and formalized so as to underline its advantages and drawbacks. Then, it is validated by various experimental results. Finally, the method is applied to estimate both the vibroacoustic transfers of combustion forces and the composition of the engine noise, as well as their variations with running condition (running speed, load and fuel's GTL content)
Becerril, Aguirre Cesar. "Simulation of noise emitted by a reactive flow." Thesis, Toulouse, INPT, 2017. http://www.theses.fr/2017INPT0067/document.
Combustion noise is increasing its relative contribution to aircraft noise, while other sources are being reduced and new low-NOx emission combustion chambers being built. Two mechanisms are responsible for this noise source: direct noise in which acoustic waves are generated by the flame and propagate to the outlet of the aero-engine, and indirect noise, where entropy waves generate noise as they are accelerated and decelerated in the turbine stages. In this work, the analytical models used for the propagation of waves through non-homogeneous flows, including the generation of indirect noise, are revised and extended. In the first part, the quasi-1D case is studied, extending the analytical method to non-zero frequencies and validating the results with numerical methods and experimental data. In the second part, the 2D method for the case of compact turbine blades is studied and validated using numerical simulations of a rotating blade and of a complete turbine stage. Finally, in the third part of this thesis, these models are combined with reactive and compressible Large Eddy Simulations (LES) of combustion chambers to build a hybrid approach, named CHORUS, able to predict combustion noise
Книги з теми "Bruit – Combustion":
(Editor), Joseph Cuschieri, Stewart Glegg (Editor), and Yan Young (Editor), eds. Proceedings of Inter-Noise 99. Inst of Noise Control Engineer, 1999.