Relevant bibliographies by topics / SWIRL

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'SWIRL'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 June 2025

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Journal articles on the topic "SWIRL"

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Zhao, Wanqi, Xin Ren, Bin Liu, Yao Xiao, and Dawei Liu. "Formation of Lunar Swirls: Implication from Derived Nanophase Iron Abundance." Remote Sensing 17, no. 8 (2025): 1324. https://doi.org/10.3390/rs17081324.

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Lunar swirls are enigmatic features on the Moon’s surface, and their formation remains debated. Previous studies suggest that the distinctive spectral characteristics of lunar swirls result from the asymmetric space weathering between their bright markings (on-swirl) and dark surrounding background (off-swirl) regions. Nanophase iron (npFe0), as the product of space weathering, directly reflects this varying degree of space weathering. In this study, we investigated the formation of lunar swirls from the perspective of the npFe0 distribution across five lunar swirls using Chang’e-1 (CE-1) Interference Imaging Spectrometer (IIM) data. Our results show that (1) on-swirl regions exhibit an obvious lower npFe0 abundance compared to their backgrounds; (2) the relationship between the npFe0 abundance in swirl dark lanes and the off-swirl regions is associated with different stages of space weathering; (3) the difference in the npFe0 abundance between on-swirl regions and off-swirl fresh craters could be due to their different weathering processes; and (4) there is a correlation between npFe0, water content, and the strength of magnetic anomalies related to lunar swirls. These findings support the view that the process of solar wind deflection leads to the preservation of swirl surfaces with reduced space weathering and provide a new perspective for comparing different swirl formation models.
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Elkersh, A. M., A. H. Elgammal, and N. R. L. Maccallum. "An Experimental Investigation of the Performance of Equiangular Annular Diffusers with Swirled Flow." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 199, no. 4 (1985): 293–97. http://dx.doi.org/10.1243/pime_proc_1985_199_126_02.

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An experimental study of the influence of geometrical parameters and swirl on the performance of equiangular diffusers is presented. Three diffusers were tested over a range of inlet swirls up to 45°, the swirls being of free vortex distribution. The data presented indicate similar flow patterns for different cant angles, and show that the centrifugal forces due to swirl stabilize the flow on the outer wall, while increasing the tendency towards separation at the inner wall. Diffuser performance improves as the inlet swirl increases up to 30°, the improvement being influenced by area ratio and cant angle. A further increase of swirl causes a deterioration of performance.
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Kinczyk, Mallory J., Brett W. Denevi, Hiroyuki Sato, et al. "Photometry of Lunar Swirls in Comparison to Fresh Crater Ejecta." Planetary Science Journal 6, no. 3 (2025): 57. https://doi.org/10.3847/psj/adafa6.

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Abstract Swirls are sinuous high-reflectance lunar surface features collocated with crustal magnetic anomalies. These bright features and their geographical relationship to magnetic anomalies have been studied for decades, although their cause remains unclear. Several mechanisms for swirl formation have been proposed, including altered space weathering due to solar wind shielding, scouring of the surface by cometary impacts, and sorting of regolith materials. We use an empirical phase curve analysis and Hapke radiative transfer modeling of single-scattering albedo, bidirectional reflectance, and the angular width of the shadow hiding opposition effect to investigate regolith and crater ejecta properties at three prominent swirl sites: Reiner Gamma, Firsov, and Mare Ingenii. We assess the photometric differences between swirls, nearby background regolith, and fresh impact crater ejecta, and discuss implications for swirl formation. Our results suggest that both swirl and background regolith are consistently less backscattering than fresh crater ejecta, although swirl regolith and crater ejecta within swirls maintain higher single-scattering albedo values than the corresponding background materials. Physical processing via micrometeoroid impacts may explain the similar backscattering characteristics of swirl and background regolith, while additional space weathering of background regolith by solar wind causes differences in single-scattering albedo. In contrast, fresh crater ejecta is more backscattering than both swirl and background regolith, likely due to the impact process that exposes blocky material and alters the nearby surface. As a result, an anomalous space weathering environment caused by solar wind shielding remains a compelling hypothesis for the high-reflectance nature of lunar swirls.
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Chuang, Frank C., Matthew D. Richardson, John R. Weirich, Amanda A. Sickafoose, and Deborah L. Domingue. "Mapping Lunar Swirls with Machine Learning: The Application of Unsupervised and Supervised Image Classification Algorithms in Reiner Gamma and Mare Ingenii." Planetary Science Journal 3, no. 10 (2022): 231. http://dx.doi.org/10.3847/psj/ac8f43.

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Abstract Lunar swirls are recognized as broad, bright albedo features in various regions of the Moon. These features are often separated by dark off-swirl lanes or terminate against the dark background, such as lunar maria. Prior mapping of swirls has been done primarily by albedo contrast, which is prone to subjectivity. Closer examination of on-swirl areas shows that they are not uniform, making the boundary between on- and off-swirl difficult to map with certainty. We have applied machine learning techniques to address these issues by identifying the number of swirl units and then mapping them based on actual reflectance, or I/F data. Using LROC NAC paired stereo images that are converted to I/F reflectance at a range of incidence angles, we applied both unsupervised K-means clustering and supervised Maximum Likelihood Classification algorithms to classify and map portions of lunar swirls in Reiner Gamma and Mare Ingenii. Results show that the classification maps are a reasonable match to the representative albedos for the two study regions. A third transitionary swirl unit, termed diffuse-swirl, is present in both the maps and the cumulative distribution plots of the reflectance values. Overall, we find that the use of both algorithms provides independent confirmation of both the number and location of these units and their interrelation. More importantly, the algorithms remove mapping subjectivity by using quantitative information. The data and the statistics generated from the maps also have value in future studies by placing limits for categorizing swirl units in different regions on the Moon.
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Hess, M., C. Wöhler, M. Bhatt, et al. "Processes governing the VIS/NIR spectral reflectance behavior of lunar swirls." Astronomy & Astrophysics 639 (July 2020): A12. http://dx.doi.org/10.1051/0004-6361/201937299.

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We investigated six bright swirls associated with magnetic anomalies of variable strength using Chandrayaan-1 Moon Mineralogy Mapper (M3) hyperspectral image data. We examined the 3 μm absorption band generally ascribed to solar wind-induced OH/H2O and spectral trends in the near-infrared wavelength range at on-swirl and off-swirl locations. We found that the 3 μm absorption band is weaker at on-swirl than at off-swirl locations and shows only weak variations with time-of-day. This result is consistent with magnetic anomaly shielding that reduces solar wind interaction with the surface. For a small swirl structure in Mare Moscoviense, we found the 3 μm absorption band to be similar to that of its surroundings due to the absence of strong magnetic shielding. Our spectral analysis results at on-swirl and off-swirl locations suggest that the spectral trends at on-swirl and off-swirl locations cannot always be explained by reduced space-weathering alone. We propose that a combination of soil compaction possibly resulting from the interaction between the surface and cometary gas and subsequent magnetic shielding is able to explain all observed on-swirl vs. off-swirl spectral trends including the absorption band depth near 3 μm. Our results suggest that an external mechanism of interaction between a comet and the uppermost regolith layer might play a significant role in lunar swirl formation.
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Cho, Eunjin, Chae Kyung Sim, Seul-Min Baek, Minsup Jeong, and Young-Jun Choi. "Reddening and darkening trends of on/off swirls and the relationship with magnetic field strength." Publications of the Astronomical Society of Japan 73, no. 6 (2021): 1604–14. http://dx.doi.org/10.1093/pasj/psab096.

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Abstract Lunar swirls are albedo features associated with magnetic anomalies, and their formation mechanism has long been debated. Because spectral properties of lunar swirls provide information on space weathering environments and surface compositions, differences in the spectra between swirls and background regions can give a clue to their formation. We analyze space weathering for swirls in the lunar highlands and maria using the VIS-NIR spectral slope, 1550 nm reflectance, and 950 nm band depth. We find that highland swirls show lower reddening-to-darkening ratios than off-swirl regions, implying more decreases of nanophase iron relative to microphase iron on swirls. We also use magnetic field data to investigate the influence of the crustal magnetic field on the space weathering of a few selected swirls. The Reiner Gamma swirl becomes more immature as the magnetic field strength increases, although the entire swirl has a high albedo. Especially, the Reiner Gamma tail shows that the stronger magnetic field makes the surface undergo less spectral reddening. Our results support the solar wind stand-off hypothesis, which is that the solar wind deflected by the crustal field determines the optical property of the surface.
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Zhang, Shenghui, Shuiting Ding, Peng Liu, and Tian Qiu. "Effect of Hot Streak on Aerothermal Performance of High Pressure Turbine Guide Vane under Different Swirl Intensities." Aerospace 9, no. 10 (2022): 579. http://dx.doi.org/10.3390/aerospace9100579.

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In advanced civil aero-engine, the gas exiting combustor typically features hot streak (HS) and swirl that affect the aerothermal performances of the high pressure (HP) nozzle guide vane (NGV). The purpose of this paper is to study the influences of HS on HP NGV aerothermal behaviors under swirl with various intensities. The numerical investigations were conducted on the first NGV of GE-E3 HP turbine. Four swirl intensities (|SN| = 0, 0.25, 0.50, 0.75) and two swirl orientations (positive and negative) were considered. The result indicates that the relative strengths between the swirl and its induced radial pressure gradient dominate the flow patterns on vane surfaces. Thus, the diverse streamlines distributions appear on the surfaces and the dominated factor on each surface does not vary with swirl intensity. The swirl redistributes the cold and hot fluid and thus generates the relatively hot oblique strip and cold region at the upstream of vane. The heat load on the vane that is not directly impinged by HS is dictated by the radial migration of the fluids originating from the regions aforementioned at |SN| = 0.25 and 0.50. However, at |SN| = 0.75, the transverse movement of HS due to the intense swirl causes additional thermal load. The heat load on the vane that faces HS is mainly determined by the radial migration of HS. The swirl alters the heat transfer distribution on vane surfaces remarkably. With positive swirl, the heat transfer coefficients at the lower span of suction side and pressure side are enhanced and weakened respectively. As expected, the opposite trends are observed in the negative swirl case. Swirl also affects boundary layer transition, and then affecting heat transfer. Positive and negative swirls both advance the transition on the suction side of vane directly impinged by the swirl, and with the increase of swirl intensity, transition onset shifts toward upstream.
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Clarke, Jenni. "Swirl by swirl." Early Years Educator 22, no. 5 (2020): S12—S13. http://dx.doi.org/10.12968/eyed.2020.22.5.s12.

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Give children time to explore patterns in nature and develop their ability to appreciate and identify shape and design. Learning is maximised when it is led by children as part of in the moment planning, explains Jenni Clarke.
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Weirich, John R., Deborah L. Domingue, Frank C. Chuang, et al. "The Search for Topographic Correlations within the Reiner Gamma Swirl." Planetary Science Journal 4, no. 11 (2023): 212. http://dx.doi.org/10.3847/psj/ace2b8.

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Abstract Lunar swirls have been traditionally considered to be unaffected by topographic changes. Yet, correlations between areas of high albedo and lower elevations are observed in regions of the Mare Ingenii swirl. Here, we apply similar techniques used at Mare Ingenii to determine if correlations between swirl units and topography also exist within Reiner Gamma. We generate topography using the techniques of stereophotoclinometry to Lunar Reconnaissance Orbiter Camera Narrow Angle Camera images to derive meter- to submeter-scale topography. We choose a 50 km2 study region with a 2.6 m ground sample distance (GSD), and within this region there is a 1 km2 subregion with a 0.8 m GSD. We use surface reflectance data at multiple viewing geometries to classify these regions into different swirl units using machine learning techniques. Statistical analyses of the data show mean height variations between on- and off-swirl of ∼4 m, with on-swirl at a lower elevation. It is not clear how this scale of elevation difference influences the formation of swirl units, but it supports postulations of dust migration and magnetic sorting contributing to their formation.
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Shih, T. I.-P., and Y. L. Lin. "Controlling Secondary-Flow Structure by Leading-Edge Airfoil Fillet and Inlet Swirl to Reduce Aerodynamic Loss and Surface Heat Transfer." Journal of Turbomachinery 125, no. 1 (2003): 48–56. http://dx.doi.org/10.1115/1.1518503.

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Computations, based on the ensemble-averaged compressible Navier-Stokes equations closed by the shear-stress transport (SST) turbulence model, were performed to investigate the effects of leading-edge airfoil fillet and inlet-swirl angle on the flow and heat transfer in a turbine-nozzle guide vane. Three fillet configurations were simulated: no fillet (baseline), a fillet whose thickness fades on the airfoil, and a fillet whose thickness fades on the endwall. For both fillets, the maximum height above the endwall is positioned along the stagnation zone/line on the airfoil under the condition of no swirl. For each configuration, three inlet swirls were investigated: no swirl (baseline) and two linearly varying swirl angle from one endwall to the other (+30 to −30 deg and −30 to +30 deg). Results obtained show that both leading-edge fillet and inlet swirl can reduce aerodynamic loss and surface heat transfer. For the conditions of this study, the difference in stagnation pressure from the nozzle’s inlet to its exit were reduced by more than 40% with swirl or with fillet without swirl. Surface heat transfer was reduced by more than 10% on the airfoil and by more than 30% on the endwalls. When there is swirl, leading-edge fillets became less effective in reducing aerodynamic loss and surface heat transfer, because the fillets were not optimized for swirl angles imposed. Since the intensity and size of the cross flow were found to increase instead of decrease by inlet swirl and by the type of fillet geometries investigated, the results of this study indicate that the mechanisms responsible for aerodynamic loss and surface heat transfer are more complex than just the intensity and the magnitude of the secondary flows. This study shows their location and interaction with the main flow to be more important, and this could be exploited for positive results.
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Dissertations / Theses on the topic "SWIRL"

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Ben-Yeoshua, Moshe 1957. "Coaxial jets with swirl." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/291734.

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The near field of coaxial air jets, with swirl in the outer one, was investigated experimentally. Axial and azimuthal velocities were mapped using hot-wire anemometry, and static pressure measurements were obtained using a pitot tube. The flow was visualized using a double-pass schlieren system. The flow is sensitive to both the amount of swirl, characterized by the swirl number S, and the mass flow ratio between the outer and inner jets, mr. A necessary condition for recirculation to occur was that S > 0.58 and mr > 8.5. The magnitude of a pressure deficit in the centerline strongly depends on mr, while the existence of swirl appears to have a triggering effect on setting up this pressure gradient. Spectral analysis shows distinct characteristics dependent on the occurrence of recirculation. Because these features were observed upstream of the recirculation region, the vortex breakdown in this experiment may be related to flow instabilities.
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Yellugari, 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.

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Ayache, Simon Victor. "Simulations of turbulent swirl combustors." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243609.

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This thesis aims at improving our knowledge on swirl combustors. The work presented here is based on Large Eddy Simulations (LES) coupled to an advanced combustion model: the Conditional Moment Closure (CMC). Numerical predictions have been systematically compared and validated with detailed experimental datasets. In order to analyze further the physics underlying the large numerical datasets, Proper Orthogonal Decomposition (POD) has also been used throughout the thesis. Various aspects of the aerodynamics of swirling flames are investigated, such as precession or vortex formation caused by flow oscillations, as well as various combustion aspects such as localized extinctions and flame lift-off. All the above affect flame stabilization in different ways and are explored through focused simulations. The first study investigates isothermal air flows behind an enclosed bluff body, with the incoming flow being pulsated. These flows have strong similarities to flows found in combustors experiencing self-excited oscillations and can therefore be considered as canonical problems. At high enough forcing frequencies, double ring vortices are shed from the air pipe exit. Various harmonics of the pulsating frequency are observed in the spectra and their relation with the vortex shedding is investigated through POD. The second study explores the structure of the Delft III piloted turbulent non-premixed flame. The simple configuration allows to analyze further key combustion aspects of combustors, with further insights provided on the dynamics of localized extinctions and re-ignition, as well as the pollutants emissions. The third study presents a comprehensive analysis of the aerodynamics of swirl flows based on the TECFLAM confined non-premixed S09c configuration. A periodic component inside the air inlet pipe and around the central bluff body is observed, for both the inert and reactive flows. POD shows that these flow oscillations are due to single and double helical vortices, similar to Precessing Vortex Cores (PVC), that develop inside the air inlet pipe and whose axes rotate around the burner. The combustion process is found to affect the swirl flow aerodynamics. Finally, the fourth study investigates the TECFLAM configuration again, but here attention is given to the flame lift-off evident in experiments and reproduced by the LES-CMC formulation. The stabilization process and the pollutants emission of the flame are investigated in detail.
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Pantelides, Kyriacos. "Isothermal and combusting swirl-stabilised." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397059.

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Ahmad, N. T. "Swirl stabilised gas turbine combustion." Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356423.

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Zannoni, Marco. "Simulazione dinamica swirl in motore diesel." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9268/.

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Kashdan, Julian Takashi. "Experiments on intermittent swirl generated sprays." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252188.

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Shelil, Nasser. "Flashback studies with premixed swirl combustion." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/55494/.

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The important conclusion was reached that when combusting H2/CH 4 fuel mixes flashback behaviour approaches that of pure methane for equivalence ratios less than about 0.65, all pressures investigated up to 7 bara and air inlet temperatures of 300 and 473K. Significant deleterious changes in flashback behaviour for H2/CH4 fuel mixes occurred for air inlet temperatures of 673K, although operation at weak equivalence ratios less than 0.65 was still beneficial.
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DUARTE, 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.

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O presente trabalho é um estudo experimental das características de troca de calor e massa de um jato de ar incidindo ortogonalmente sobre uma placa. o estudo tem por objetivo avaliar a influência nos coeficientes de troca da presença de um componente circunferencial na velocidade do jato. Durante os experimentos foram investigadas a influência do número de Reynolds do jato, da distância jato/placa e da intensidade do escoamento espiralado (número de swirl). Os coeficientes de troca foram determinados utilizando-se a técnica de sublimação de naftaleno em conjunto com a analogia entre os provessos de transferência de calor e massa. Coeficientes de troca de massa locais foram determinados utilizando-se uma mesa de coordenadas computadorizada especialmente construída, que permitiu a obtenção de medidas detalhadas tanto na região de estagnação do jato quanto na região mais externa. Coeficientes globais de troca de massa foram obtidos independentemente dos locais através de pesagem. Os resultados demonstraram uma diminuição nos coeficientes de troca de massa do jato com o aumento da intensidade do escoamento espiralado. Visualizações do escoamento junto à placa foram realizadas, utilizando-se a técnica de óleo com o negro de fumo. Os resultados das visualizações demonstraram a existência de regiões de separação junto à fronteira da zona de estagnação. Para altos valores do número de swirl foram verificadas fortes reversões do escoamento na região de estagnação.<br>The 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.
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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.

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Books on the topic "SWIRL"

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Sidman, Joyce. Swirl by swirl: Spirals in nature. Houghton Mifflin Harcourt, 2011.

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Perelman, Helen. Rainbow swirl. Aladdin, 2010.

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Perelman, Helen. Rainbow swirl. Aladdin, 2010.

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1951-, Bordhi Cat, and Lonergan Zoë, eds. Knit, swirl!: Uniquely flattering one piece, one seam swirl jackets. SeaStack Pub., 2011.

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Dhar, Ravi K., and Pooja Rana. Media in the swirl. Pentagon Press, 2012.

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ill, Krommes Beth, and Fan Xiaoxing, eds. Mei li de luo xuan: Swirl by swirl : spirals in nature. Xin xing chu ban she, 2014.

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Hoffmann, Alex C., and Louis E. Stein. Gas Cyclones and Swirl Tubes. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-07377-3.

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McVey, J. B. Fuel-injector/air-swirl characterization. National Aeronautics and Space Administration, 1988.

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B, Kennedy J., Russell S, and United States. National Aeronautics and Space Administration., eds. Fuel-injector/air-swirl characterization. National Aeronautics and Space Administration, 1988.

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B, Kennedy J., Russell S, and United States. National Aeronautics and Space Administration., eds. Fuel-injector/air-swirl characterization. National Aeronautics and Space Administration, 1988.

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Book chapters on the topic "SWIRL"

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Gooch, Jan W. "Swirl." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11473.

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Tillett, Wade A. "Swirl." In Navigating the Postmodern Condition. Routledge, 2024. http://dx.doi.org/10.4324/9781003471882-21.

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Kramer, Georgiana. "Lunar Swirl." In Encyclopedia of Planetary Landforms. Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-9213-9_557-1.

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Basu, Prabir, Cen Kefa, and Louis Jestin. "Swirl Burners." In Mechanical Engineering Series. Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1250-8_8.

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Kramer, Georgiana. "Lunar Swirl." In Encyclopedia of Planetary Landforms. Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-3134-3_557.

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Colonnelli, Iacopo, Doriana Medić, Alberto Mulone, Viviana Bono, Luca Padovani, and Marco Aldinucci. "Introducing SWIRL: An Intermediate Representation Language for Scientific Workflows." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-71162-6_12.

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AbstractIn the ever-evolving landscape of scientific computing, properly supporting the modularity and complexity of modern scientific applications requires new approaches to workflow execution, like seamless interoperability between different workflow systems, distributed-by-design workflow models, and automatic optimisation of data movements. In order to address this need, this article introduces SWIRL, an intermediate representation language for scientific workflows. In contrast with other product-agnostic workflow languages, SWIRL is not designed for human interaction but to serve as a low-level compilation target for distributed workflow execution plans. The main advantages of SWIRL semantics are low-level primitives based on the send/receive programming model and a formal framework ensuring the consistency of the semantics and the specification of translating workflow models represented by Directed Acyclic Graphs (DAGs) into SWIRL workflow descriptions. Additionally, SWIRL offers rewriting rules designed to optimise execution traces, accompanied by corresponding equivalence. An open-source SWIRL compiler toolchain has been developed using the ANTLR Python3 bindings.
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"Swirl." In Encyclopedic Dictionary of Polymers. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_11259.

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"Swirl." In Landbridge. Duke University Press, 2024. http://dx.doi.org/10.1515/9781478060116-039.

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Sharifi-Razavi, Athena, Amir Moghadam Ahmadi, and Ashkan Mowla. "Swirl." In Pictorial Atlas of Neuroradiological Signs. Elsevier, 2024. http://dx.doi.org/10.1016/b978-0-443-23528-3.00020-0.

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"Swirl." In Art Of Texturing & Coving. Routledge, 2003. http://dx.doi.org/10.4324/9780203497715-0.

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Conference papers on the topic "SWIRL"

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Gauthier, Matthew. "Generating Pre-swirl Using Mesh Deformation." In OCEANS 2024 - Halifax. IEEE, 2024. http://dx.doi.org/10.1109/oceans55160.2024.10753901.

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Griggs, Lee. "swirl." In ACM SIGGRAPH 2007 computer animation festival. ACM Press, 2007. http://dx.doi.org/10.1145/1281740.1281858.

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Halpin, John L. "Swirl Generation and Recirculation Using Radial Swirl Vanes." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-169.

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The concept of the Swirl Number and its effect on recirculation is reviewed and problems with it are identified. Swirl generation through the use of radial inlet swirl vanes is then studied. The effect of vane and swirl cup design on recirculation is then evaluated using finite element computer modeling and verified using tufting tests. Vane geometry, combustor dome geometry, co- vs. counter-rotation and mass flow effects are all evaluated. It is shown that co- and counter-rotation generate very similar flow fields and recirculated mass flows. An approach for calculating swirl numbers in multiple swirler designs is proposed.
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Schumaker, S., Stephen Danczyk, and Malissa Lightfoot. "Effect of Swirl on Gas-Centered Swirl-Coaxial Injectors." In 47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-5621.

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Williams, M., T. Ferguson, Adiel Guinzburg, and M. Stewart. "Inducer back-swirl." In 15th AIAA Computational Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-3001.

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Jing, Yushi, Henry Rowley, Jingbin Wang, David Tsai, Chuck Rosenberg, and Michele Covell. "Google image swirl." In the 21st international conference companion. ACM Press, 2012. http://dx.doi.org/10.1145/2187980.2188116.

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Kodama, Sachiko. "MorphoTower / Spiral Swirl." In ACM SIGGRAPH 2006 Art gallery. ACM Press, 2006. http://dx.doi.org/10.1145/1178977.1179034.

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Sheoran, Yogi, and Bruce Bouldin. "A Versatile Design of a Controlled Swirl Distortion Generator for Testing Gas Turbine Engines." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50657.

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Inlet swirl distortion has recently become a major area of concern in the gas turbine engine community. Gas turbine engines are being installed in embedded installations that are downstream of increasingly complicated inlet systems, such as those used in Unmanned Aerial Vehicles (UAVs). These inlet systems can produce complex swirl patterns in addition to total pressure distortion. The effect of swirl distortion on engine or compressor performance and operability must be evaluated. The gas turbine community is developing methodologies to measure and characterize swirl distortion. There is a strong need to develop a mechanism for generating prescribed swirl distortion intensities and patterns for testing compression system sensitivity to swirl distortion. Several devices such as delta wings or complex turning vanes have been proposed and used to generate swirl distortion with limited success. This paper presents a versatile swirl distortion generator design that produces a wide range of swirl distortion patterns of a prescribed strength, including bulk swirl, 1/rev, and 2/rev patterns. It also creates different paired swirl patterns, varying from equal and opposite “twin swirls” to offset swirl pairs. This paper describes the design of the swirl generator. Computational Fluid Dynamics (CFD) results are presented along with some test data which illustrate how the swirl generator functions and how altering the swirl generator configuration can produce different swirl distortion patterns.
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Eck, Mattias Ettore Giulio, Philipp Maximilian zur Nedden, Jakob Georg Raimund von Saldern, Alessandro Orchini, and Christian Oliver Paschereit. "Design of a Swirl-Stabilized Burner With Fluidically Variable Swirl Number." In ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-103062.

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Abstract For flame stabilization, burner systems are usually equipped with swirlers which incite a defined air rotation, quantified by the swirl number. In consequence, the swirl number, which significantly influences the flame dynamics, is fixed. Applications exist in which the swirl number can be varied through mechanically adjustable swirler geometries. Such systems, however, comprise moving parts and actuators, the operation of which might be disadvantageous in a combustor environment. Hence, a swirler is developed that allows for continuous swirl number changes by means of fluidic flow control. The direction of a primary air flow is changed through the injection of an adjacent wall jet which follows a curved surface. This causes a directional change of the primary flow due to entrainment effects. The swirler consists of a cylindrical plenum into which a primary air flow is led through azimuthally distributed channels. Each channel comprises a slotted wall. A secondary air mass flow can be induced passing through the slots, hence creating an adjacent wall jet, which subsequently follows a curved surface. The resulting azimuthal direction change of the primary flow depends on the induced secondary air mass flow. The angular flow momentum and thus the swirl number can be therefore continuously changed. The development process of the proposed swirler is presented and the efficiency of swirl variation of different geometries is qualitatively assessed through computational flow simulations. The effects of stationary operation and unsteady swirl number variations are herein investigated and, moreover, the variation performance is assessed for a range of different air mass flows. The simulation results show the potential of a linear swirl number variation with respect to the induced secondary air mass flow. Moreover, the simulation results show that the achieved swirl numbers are comparable to those of state-of-the-art swirlers.
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Mongia, H., M. Al-Roub, A. Danis, et al. "Swirl cup modeling. I." In 37th Joint Propulsion Conference and Exhibit. American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-3576.

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Reports on the topic "SWIRL"

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Lightfoot, Malissa D., Stephen A. Danczyk, and Douglas G. Talley. Scaling of Gas-Centered Swirl-Coaxial Injectors. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada502809.

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Ala Qubbaj. NUMERICAL SIMULATION OF NATURAL GAS-SWIRL BURNER. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/841149.

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Muss, J. A., C. W. Johnson, R. K. Cohn, P. A. Strakey, and R. W. Bates. Swirl Coaxial Injector Development. Part I: Test Results. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada408502.

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Cheng, G. C., C. W. Johnson, and R. K. Cohn. Swirl Coaxial Injector Development. Part II: CFD Modeling. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada412040.

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Cheng, Gary C., Rory R. Davis, Curtis W. Johnson, Jeffrey A. Muss, and Daniel A. Griesen. Development of GOX/Kerosene Swirl-Coaxial Injector Technology. Defense Technical Information Center, 2003. http://dx.doi.org/10.21236/ada416879.

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Parr, T., K. Wilson, K. Schadow, J. Cole, and N. Widmer. Sludge Combustor Using Swirl and Active Combustion Control. Defense Technical Information Center, 2000. http://dx.doi.org/10.21236/ada382663.

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Hawley, Adam. PR-015-17606-R03 Flow Conditioner Swirl Reduction Testing. Pipeline Research Council International, Inc. (PRCI), 2019. http://dx.doi.org/10.55274/r0011585.

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This project evaluated the relative performance of the CPA 50E, CPA 55E, and CPA 65E flow conditioners manufactured by Canada Pipeline Accessories (CPA). The flow conditioners were tested to determine their ability to reduce swirl in a natural gas flow and to compare the audible noise of the flow conditioners over a range of flow rates.
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Ruggles, M. B. Tensile and compressive behavior of a swirl mat composite. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/296739.

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Gutmark, Ephralm J., and Guoqiang Li. Combustion Control in Industrial Multi-Swirl Stabilized Spray Combustor. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada441269.

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Heister, Stephen. Modeling Liquid Rocket Engine Atomization and Swirl/Coaxial Injectors. Defense Technical Information Center, 2008. http://dx.doi.org/10.21236/ada494724.

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