Dissertations / Theses on the topic 'SwIRa'
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Ben-Yeoshua, Moshe 1957. "Coaxial jets with swirl." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/291734.
Full textYellugari, Kranthi. "Effects of Swirl Number and Central Rod on Flow in Lean Premixed Swirl Combustor." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872979440851.
Full textAyache, Simon Victor. "Simulations of turbulent swirl combustors." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243609.
Full textPantelides, Kyriacos. "Isothermal and combusting swirl-stabilised." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397059.
Full textAhmad, N. T. "Swirl stabilised gas turbine combustion." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356423.
Full textZannoni, Marco. "Simulazione dinamica swirl in motore diesel." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9268/.
Full textKashdan, Julian Takashi. "Experiments on intermittent swirl generated sprays." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252188.
Full textShelil, Nasser. "Flashback studies with premixed swirl combustion." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/55494/.
Full textDUARTE, LUIZ GUSTAVO DA CRUZ. "MASS TRANSFER TO SWIRL IMPINGING JETS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1994. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24868@1.
Full textThe present work is an experimental study of the mass transfer characteristics of a swirling jet impinging on a flat plate. The main objective of the investigation was to determine the influence of a circumferential velocity component (the swirl component) on the local and average mass transfer coefficients at the plate surface. The dimensionless parameters investigated were the jet Reynolds number, the jet-to-plate distance, and the strength of the swirl flow given by the swirl number. Mass transfer coefficients were obtained utilizing the naphthalene sublimation technique. The local coefficients were determined employing a computerized coodinate table which allowed a detailed study of the effects of the presence of the swirl component. Average coefficients were determined independently through precision weighing, and displayed excellent agreement with the integrated local coefficients. The results demonstrated that the presence of the swirl component decreases the mass transfer coefficients, when compared with the non-swirl case. Flow visualization experiments were conducted utilizing the oil-lamp black technique. The results revealed regions of reverse flow at the stagnation zone for high values of the swirl number.
Hoopes, Kevin M. "A New Method for Generating Swirl Inlet Distortion for Jet Engine Research." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/49545.
Full textA new method capable of recreating any arbitrary swirl distortion profile is needed in order to expand the capabilities of inlet distortion testing. This will allow designers to explore how an engine would react to a particular engine airframe combination as well as methods for creating swirl distortion tolerant engines. The following material will present such a method as well as experimental validation of its effectiveness.
Master of Science
Prassas, Ilias. "Combustion of pulverised coal in swirl burners." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286343.
Full textNovotny, Pavel [Verfasser]. "Stability of Swirl Tube Flow / Pavel Novotny." München : Verlag Dr. Hut, 2019. http://d-nb.info/1200755308/34.
Full textYapici, Sinan. "Electrochemical mass transfer in annular swirl flow." Thesis, University of Exeter, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303777.
Full textHatem, Fares. "Flashback analysis and avoidance in swirl burners." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/103700/.
Full textNehring, Wendy M. "Nursing leadership during a time of swirl." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/6721.
Full textIslek, Akay A. (Akay Aydin). "The Impact of Swirl in Turbulent Pipe Flow." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4955.
Full textPrakash, Shashvat. "Lean Blowout Mitigation in Swirl Stabilized Premixed Flames." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16159.
Full textFiskum, Andreas. "Calculation of NOx Formation in a Swirl Burner." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12869.
Full textBonaldo, Alessio. "Experimental Characterisation of Swirl Stabilized Annular Stratified Flames." Thesis, Cranfield University, 2007. http://hdl.handle.net/1826/3171.
Full textBaker, Philip. "Investigation of barrel swirl in spark ignition engines." Thesis, Coventry University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364160.
Full textFrost, Mark I. "The clustering of galaxies in the SWIRE survey." Thesis, University of Sussex, 2010. http://sro.sussex.ac.uk/id/eprint/2363/.
Full textMalý, Milan. "Internal Flow of Spill-Return Pressure-Swirl Atomizers." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-437981.
Full textXUE, JIANQING. "COMPUTATIONAL SIMULATION OF FLOW INSIDE PRESSURE-SWIRL ATOMIZERS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100228747.
Full textMehdi, Ahad. "Effect of swirl distortion on gas turbine operability." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/12129.
Full textChinn, John Joss. "The internal flow physics of swirl atomizer nozzles." Thesis, University of Manchester, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488302.
Full textBauduin, Hadrien. "Contribution expérimentale à l'étude d'écoulements internes avec swirl." Thesis, Valenciennes, 2014. http://www.theses.fr/2014VALE0015/document.
Full textThis experimental work is interested in understanding the flow downstream a short static swirler. Inducing a swirl motion is a known solution to increase the wall velocity gradient. The increase in wall shear stress is useful in industrial heat exchangers in order to enhance their heat transfer capabilities and reduce their fouling rates. We try to go deeper into knowledge of decaying swirl flows, for low Reynolds number for which energy interest is greater a priori. First, we study the flow field with optical methods in order to identify type of vortex characteristics of the swirl. Second, electrochemical method is used to measure the unsteady wall shear stress. By analogy, these measurements give a first estimate of the heat transfer for the case of non-isothermal flows
Camata, Mauricio Bishop. "Análise da influência de diferentes geometrias de retificador de fluxo no desempenho de um sensor tipo \"impulse swirl meter\" utilizado para medição de cabeçotes." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3149/tde-03032017-114543/.
Full textThe swirl number of a cylinder head can be measured by a steady state flow method in which air is forced through the cylinder head for different valve openings. The sensors commonly used on the swirl measurement platform are of the ISM type (impulse swirl meter) that use a flow straightener as the main component to capture the rotational angular momentum of the air flow. This study objective is to determine the geometric dimensions for the flow straightener used in the ISM sensor, which still allows the measurement but causes the least interference on the measurement result. Sixteen different flow straighteners were constructed by rapid prototyping process. Several tests were performed on a platform that uses the steady state flow method to measure the swirl number of cylinder heads. For all tests the same cylinder head was used as swirl generator. The conclusion chapter presents the geometric dimensions that caused the least interference in the flow and resulted in a greater sensor efficiency, as well as suggestions for future studies.
Bompelly, Ravi K. "Lean blowout and its robust sensing in swirl combustors." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47529.
Full textAbdulsada, Mohammed. "Flashback and blowoff characteristics of gas turbine swirl combustor." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/24193/.
Full textNOGUEIRA, ANTONIO CARLOS RIBEIRO. "HEAT TRANSFER IN TURBULENT SWIRL FLOW THROUGH RECTANGULAR DUCTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1991. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=24953@1.
Full textO presente trabalho investigou numericamente e experimentalmente as características de transferência de calor e queda de pressão de um escoamento espiralado, turbulento, de caindo através de um duto retangular de elevada razão de aspecto. A condição de escoamento espiralado na estrada do duto foi obtida por meio de tubos paralelos contendo fitas torcidas de modo a produzir vórtices girando em sentidos opostos, dois a dois. Coeficientes de transferência de calor locais e médios foram determinados através da utilização da técnica de sublimação de naftaleno em conjunto com a anologia entre processos de transferência de calor e massa. Os valores locais foram medidos sobre toda a superfície ativa do duto, com o auxílio de uma mesa de coordenadas controlada por microcomputador. Resultados para os coeficientes transferência de calor e da queda de pressão foram obtidas para três valores do número de Reynolds do duto e para três valores da intensidade do escoamento espiralado, dados pela utilização de fitas torcidas com diferentes relações de passo/diâmetro. Para posições axiais próximas da entrada do duto, os resultados revelaram altas taxas de aumento na transferência de calor, relativamente ao caso base, representado por escoamento turbulento sem a imposição do escoamento espiralado. Os resultados para a queda de pressão demonstraram que a presença da componente tangencial da velocidade do escoamento espiralado imposto reduziu os efeitos de recuperação de pressão existentes na região de entrada de dutos com entrada abrupta. Foi também verificado que o comprimento de desenvolvimento hidrodinâmico do escoamento aumenta com a intensidade do escoamento espiralado. As equações de conservação de massa , movimento linear e energia, incorporadndo o modelo de turbulência K – E foram resolvidas numericamente para a configuração em estudo. Os resultados numéricos apresentaram boa concordância com os experimentos, permitindo a
The presente work investigated experimentally and numerically the heat transfer and pressure drop characteristics of turbulent decaying swirl flows through a rectangular duct of high aspect ratio. The swirl flow inlet condition was obtained by a set of parallel tubes with twisted-tape inserts wich produced pairs of counterrotating vortices. Local and average heat transfer coefficients were determined by the utilization of the naphthalene sublimation technique in conjunction with the analogy between heat and mass transfer. Local result were obtained along the whole active surface of the duct, utilizing a computer-assisted coordinate table and depth gage. The study encompassed the investigation of the local and average heat transfer coefficient distribution and pressure drop, for three values of the duct Reynolds number, and for three values of the swirl intensity given by different tape pitch-to-diameter rations. The results showed regions of high heat transfer augmentation situated close to the entrance of the duct, when compared to the base case results characterized by turbulent flow through a duct without the swirl flow inlet condition. The pressure drop results demonstrated that the presence of the tangencial velocity component of the imposed swirl flow was seen to reduce the pressure recover effect present in sharp-edged entrance ducts. It was also verifyied that the hydroninamic developing length increases with the intensity of the swirl flow. The equations governing conservation of mass, linear momentum and energy were solved numerically for the configuration investigated. The K-E turbulence model was employed. The numerical results displayed good agreement with the experiments and provided additional information related to velocity and temperature fields which complemented the experimental program.
Yuan, Ruoyang. "Measurements in swirl-stabilised spray flames at blow-off." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709345.
Full textLewis, Paul. "Pre-swirl rotor-stator systems : flow and heat transfer." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.516951.
Full textOh, David Y. (David Younghee). "The use of swirl to clean nuclear rocket plumes." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/46428.
Full textAl-Shaghdari, Mohammed A. "The evaluation of time-dependent flow in swirl burners." Thesis, University of South Wales, 1997. https://pure.southwales.ac.uk/en/studentthesis/the-evaluation-of-timedependent-flow-in-swirl-burners(e2caff50-bfda-4bc9-85f4-e91182d53bd7).html.
Full textGaneshalingam, Jeyakumar. "Swirl-induction for improved solid-liquid flow in pipes." Thesis, University of Nottingham, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655744.
Full textSpangelo, Øystein. "Experimental and Theoretical Studies of a Low Nox Swirl Burner." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-310.
Full textNitrogen oxides emitted to the atmosphere can cause health problems for humans and environmental problems such as acid rain and global warming. The main part of the world energy consumption involves combustion; hence nitrogen oxide abatement in combustion is an important research field. Formation and reduction of NOx in combustion and the current regulations on NOx emissions are reviewed.
A novel low NOx swirl stabilized gas burner concept, the Swirl Burner, has been studied experimentally, theoretically and numerically. Flame stabilization, rapid air and fuel mixing and internal flue gas recirculation are provided by a strongly swirling flow generated in this patented burner concept. NOx emissions have been measured below 25 and 45 ppmv dry corrected to 3% O2 in the flue gases using methane and propane as fuel respectively.
Studying the effect of varying geometrical parameters on the emissions of NOx, fuel and air supply pressure and flame stability, have resulted in an optimized burner design. The optimized Swirl Burner has successfully been scaled from a 200 kW burner down to a 20 kW burner and up to a 370 kW burner, using a constant velocity scaling criteria which is the most commonly used scaling criteria for industrial burners. Experiments with the scaled burners have revealed that the fuel to air momentum should be preserved while scaling the burner. The 200 kW and the 370 kW burners were operated stable with the boiler to burner diameter (confinement) ratio in the range 5.3-6.7. The 20 kW burner, which was operated in an un-cooled and a water-cooled combustion chamber with confinement ratio of 8.1, was found to have a narrower range of stable operation with regards to thermal throughput. High post-flame heat extraction, which is enhanced by increased confinement ratio and combustion chamber cooling, reduces the emissions of NOx, but might cause flame instabilities.
NOx emissions measured from the three Swirl Burners scale well with NOx scaling correlations based on flame volume as a leading-order parameter for NOx formation (Weber, 1996). The correlations consider the effect of heat extraction on flame volume and emissions of NOx. These correlations indicate that the heat extraction from the 20 kW burner is increasing with increasing thermal throughput. The 200 kW and the 370 kW burners were, from the correlations, found to operate with constant heat extraction.
Flame volume and shape are studied by non-intrusive measurements of OH radicals with the 20 kW burner using laser induced fluorescence. The measurements show that the flame volume is reduced with increasing thermal throughput. Measurements of NOx from this burner also show a reduction with increasing thermal throughput. These results support the theoretical considerations of the flame volume as being the leading-order parameter for NOx formation.
An evaluation of turbulence models and combustion models suitable for studying the Swirl Burner by computational fluid dynamics has been carried out. For this evaluation, a 2D computational model of the 20 kW burner has been used. For closure of the Reynolds Averaged Navier-Stokes equations for turbulent flow, three models have been evaluated.
These are the standard k-ε model, the RNG k-ε model and the Reynolds Stress model.
Also for modelling of combustion, three models have been evaluated, namely the Eddy Dissipation model, the Equilibrium PDF model and the Flamelet PDF model. For studying the Swirl Burner, a combination of the Reynolds Stress model and the Flamelet PDF model were found to be most suitable for modelling of turbulence and combustion respectively.
Computational results with the 20 kW burner indicate that flue gases are recirculated into a central toroidal recirculation zone downstream the burner exit. The computations are further compared with the OH concentrations measured with laser induced fluorescence.
Colby, Jonathan A. "Flow Field Measurements in a Counter-Swirl Stabilized Liquid Combustor." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10470.
Full textO'Connor, Jacqueline. "Response of a swirl-stabilized flame to transverse acoustic excitation." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43756.
Full textSakajo, Takashi. "Numerical Computation of three-dimensional vortex sheet with swirl flow." 京都大学 (Kyoto University), 1999. http://hdl.handle.net/2433/181452.
Full textBabbedge, Thomas Sebastian Reed. "Photometric redshifts and luminosity functions from the SWITZER SWIRE survey." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415162.
Full textSheen, Dong-Hyon. "Swirl-stabilised turbulent spray flames in an axisymmetric model combustor." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445249.
Full textNovotny, Pavel [Verfasser], and Bernhard [Akademischer Betreuer] Weigand. "Stability of swirl tube flow / Pavel Novotny ; Betreuer: Bernhard Weigand." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2019. http://d-nb.info/1201646375/34.
Full textSalcedo, Saulo Alfredo Gómez. "CFD analysis in spray combustion using a pressure swirl injector." Instituto Tecnológico de Aeronáutica, 2015. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=3292.
Full textGuimaraes, Bucalo Tamara. "Fluid Dynamics of Inlet Swirl Distortions for Turbofan Engine Research." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82921.
Full textPh. D.
Frohnapfel, Dustin Joseph. "Experimental Investigation of Fan Rotor Response to Inlet Swirl Distortion." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/71323.
Full textMaster of Science
MA, ZHANHUA. "INVESTIGATION ON THE INTERNAL FLOW CHARACTERISTICS OF PRESSURE-SWIRL ATOMIZERS." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1016634882.
Full textLI, GUOQIANG. "EMISSIONS, COMBUSTION DYNAMICS, AND CONTROL OF A MULTIPLE SWIRL COMBUSTOR." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092767684.
Full textMohamed, Jainulabdeen Mohammed Abdul Kadher. "Combustion Noise and Instabilities from Confined Non-premixed Swirl Flames." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1560867354695989.
Full textBurkhalter, Matthew W. "Atomization and mixing performance of swirl-venturi lean direct injection." Thesis, University of Iowa, 2014. https://ir.uiowa.edu/etd/1433.
Full textDawson, Dylan Paul. "Design and Low-Speed Validation of a Tailored Low-Loss Flow Straightening Device." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/97888.
Full textMS