Relevant bibliographies by topics / Shrouded fan

Contents

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

Academic literature on the topic 'Shrouded fan'

Author: Grafiati
Published: 9 March 2023

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Journal articles on the topic "Shrouded fan"

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Menq, C. H., J. H. Griffin, and J. Bielak. "The Forced Response of Shrouded Fan Stages." Journal of Vibration and Acoustics 108, no. 1 (January 1, 1986): 50–55. http://dx.doi.org/10.1115/1.3269303.

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This paper presents a general approach for modeling shrouded blade vibration that takes into consideration the nonlinear friction constraint at the shroud interface. In this approach, linear structures are characterized by receptances and shroud constraints by nonlinear impedances. The proposed methodology is presented in detail for simplified models of the bladed disk and shroud interface. The corresponding governing equations for the dynamic response are derived for both tuned and mistuned stages. As an example the method is applied to an idealized tuned stage. Two cases are considered, a lubricated shroud for which the coefficient of friction is equal to zero, and a frictionally constrained shroud. The effect of varying the shroud-to-shroud preload is studied. In the lubricated case nonlinear behavior is seen when vibrations are strong enough to result in separation of the shroud interfaces. In the case of finite friction there is a profound change in resonant frequencies when the preload is increased sufficiently to prevent gross slip at the shrouds.
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Chi, R. M., and A. V. Srinivasan. "Some Recent Advances in the Understanding and Prediction of Turbomachine Subsonic Stall Flutter." Journal of Engineering for Gas Turbines and Power 107, no. 2 (April 1, 1985): 408–17. http://dx.doi.org/10.1115/1.3239741.

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In this paper, some recent advances in the understanding and prediction of subsonic flutter of jet engine fan rotor blades are reviewed. Among the topics discussed are (i) the experimental evidence of mistuning in flutter responses, (ii) new and promising unsteady aerodynamic models for subsonic stall flutter prediction, (iii) an overview of flutter prediction methodologies, and (iv) a new research effort directed toward understanding the mistuning effect on subsonic stall flutter of shrouded fans. A particular shrouded fan of advanced design is examined in the detailed technical discussion.
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Yen, S. C., and Frank K. T. Lin. "Exit Flow Field and Performance of Axial Flow Fans." Journal of Fluids Engineering 128, no. 2 (September 19, 2005): 332–40. http://dx.doi.org/10.1115/1.2169809.

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Flow fields near the exit and the global performance parameters of the various types of axial flow fans are studied with Particle Image Velocimetry and a standard AMCA 210 flow bench. The fans used in this study included the shrouded, shroudless, and winglet-blade types. The velocity vectors, streamlines, vorticity contours, velocity distributions, and performances are presented and discussed. The flow patterns on the radial and axial planes show that a vortex always exists near the exit of the fans at various impeller angles. The experimental results demonstrate that the shrouded fan with winglets has the most stable flow field and the best fan performance.
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Liu, Yi-Xiong, Pei-Hong Cong, Yun-Wu Wu, Jin-Liang Li, and Xiang-Ping Wang. "Failure analysis and design optimization of shrouded fan blade." Engineering Failure Analysis 122 (April 2021): 105208. http://dx.doi.org/10.1016/j.engfailanal.2020.105208.

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Srinivasan, A. V., and D. G. Cutts. "Aerodynamically Excited Vibrations of a Part-Span Shrouded Fan." Journal of Engineering for Gas Turbines and Power 107, no. 2 (April 1, 1985): 399–407. http://dx.doi.org/10.1115/1.3239740.

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The structural response of a part-span shrouded fan due to an aerodynamic excitation was measured using strain gages. The excitation was provided by means of a 4-lobed distortion screen mounted upstream of the rotor. Vibration measurements made with tuned and mistuned conditions at integral order speeds have been analyzed to determine the aeromechanical response charcteristics of the assembly. The results from the experimental investigation are presented and discussed.
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Prstic, Suzana, and Avram Bar-Cohen. "“Heat Shield”—An Enhancement Device for an Unshrouded, Forced Convection Heat Sink." Journal of Electronic Packaging 128, no. 2 (February 16, 2006): 172–76. http://dx.doi.org/10.1115/1.2188955.

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The inherent advantages of forced air cooling have led to the widespread use of fully and partially shrouded heat sinks for the thermal management of high power microprocessors. The superior thermal performance that is achievable in the fully shrouded configuration is accompanied by a significant pressure drop penalty. The concept introduced in the current study, employs a thin sheet-metal “heat shield,” placed around a partially shrouded heat sink, to channel the flow directly into the heat sink. A combined numerical and experimental study has shown that the use of this “heat shield” can substantially enhance heat sink thermal performance, in a channel geometry and air flow range typical of commercial chip packages; making it comparable to that of a fully shrouded heat sink, with a substantially lower pressure drop (∼50%). In addition, this thermal enhancement device can be easily retrofitted into existing systems; improving performance without major channel and/or fan modifications.
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Moosania, Mostafa, Chao Zhou, and Site Hu. "Aerodynamics of a partial shrouded low-speed axial flow fan." International Journal of Refrigeration 130 (October 2021): 208–16. http://dx.doi.org/10.1016/j.ijrefrig.2021.05.031.

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Avanzini, Giulio, Umberto Ciniglio, and Guido de Matteis. "Full-Envelope Robust Control of a Shrouded-Fan Unmanned Vehicle." Journal of Guidance, Control, and Dynamics 29, no. 2 (March 2006): 435–43. http://dx.doi.org/10.2514/1.14314.

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de Divitiis, Nicola. "Performance and Stability Analysis of a Shrouded-Fan Unmanned Aerial Vehicle." Journal of Aircraft 43, no. 3 (May 2006): 681–91. http://dx.doi.org/10.2514/1.16210.

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Buccieri, Bryan M., and Christopher M. Richards. "Application of the aeroacoustic analogy to a shrouded, subsonic, radial fan." Journal of Sound and Vibration 385 (December 2016): 125–37. http://dx.doi.org/10.1016/j.jsv.2016.09.011.

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Dissertations / Theses on the topic "Shrouded fan"

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Speck, Michael Aldo. "The Design, Theory, and Development of the Flight Envelope for a Twin-Ducted-Fan Jetpack." Thesis, University of Canterbury. Mechanical Engineering, 2013. http://hdl.handle.net/10092/9051.

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In order to improve the flight performance of the Martin Jetpack research was undertaken to investigate the aerodynamic issues that were limiting the P-11A Jetpack's flight envelope. Through research of existing ducted-fan aircraft, a flight model describing the unique aerodynamics of the Martin Jetpack was developed using Matlab®/Simulink® software. The dynamic flight model, which can be ran in real time, includes the reactions from: ducted-fans, aircraft body aerodynamics, control surfaces, gyration and landing gear interactions. Abstract Numerous experiments were designed to quantify and validate assumptions used in the development of the model equations. The experiments took advantage of the small size of the Jetpack by designing and building test apparatuses that measured reactions directly on the actual aircraft. This avoided scaling issues that are traditionally encountered when employing wind tunnels for aerodynamic measurements. Abstract Implementing the experimental results into the model led to the modifications of the existing Jetpack airframe to produce the P-11C Jetpack prototype, which significantly improved the performance of the aircraft. The collected flight data was used to validate the model and good agreement was achieved. Abstract Based on this research a new Jetpack prototype (P-12) was developed that combined the flight performance of the P-11C Jetpack with the ability to carry a man or manned sized payload. The model was used to design the layout and to size the control vanes for the P-12 Jetpack. Further research was performed to design larger rotor and stator blades required for the P-12 Jetpack prototype. Abstract The developed model allows the user to efficiently evaluate various control methodologies and changes to key aerodynamic features of the aircraft to aid in the design and flying of the Martin Jetpack. Abstract The outcome of this research is a better understanding of the ducted-fan technology, and via the development of the Jetpack flight model, correctly applying this understanding to improve the Jetpack's flight performance.
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Ohanian, Osgar John. "Ducted Fan Aerodynamics and Modeling, with Applications of Steady and Synthetic Jet Flow Control." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/27687.

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Ducted fan vehicles possess a superior ability to maximize payload capacity while minimizing vehicle size. Their ability to both hover and fly at high speed is a key advantage for information-gathering missions, particularly when close proximity to a target is essential. However, the ducted fanâ s aerodynamic characteristics pose difficulties for stable vehicle flight and therefore require complex control algorithms. In particular, they exhibit a large nose-up pitching moment during wind gusts and when transitioning from hover to forward flight. Understanding ducted fan aerodynamic behavior and how it can be altered through flow control techniques are the two prime objectives of this work. This dissertation provides a new paradigm for modeling the ducted fanâ s nonlinear behavior and new methods for changing the duct aerodynamics using active flow control. Steady and piezoelectric synthetic jet blowing are employed in the flow control concepts and are compared. The new aerodynamic model captures the nonlinear characteristics of the force, moment, and power data for a ducted fan, while representing these terms in a set of simple equations. The model attains excellent agreement with current and legacy experimental data using twelve non-dimensional constants. Synthetic jet actuators (SJA) have potential for use in flow control applications in UAVs with limited size, weight, and power budgets. Piezoelectric SJAs for a ducted fan vehicle were developed through two rounds of experimental designs. The final SJA design attained peak jet velocities in the range of 225 ft/sec (69 m/s) for a 0.03â x 0.80â rectangular slot. To reduce the magnitude of the nose-up pitching moment in cross-winds, two flow control concepts were explored: flow separation control at the duct lip, and flow turning at the duct trailing edge using a CoandÄ surface. Both concepts were experimentally proven to be successful. Synthetic jets and steady jets were capable of modifying the ducted fan flow to reduce pitching moment, but some cases required high values of steady blowing to create significant responses. Triggering leading edge separation on the duct lip was one application where synthetic jets showed comparable performance to steady jets operating at a blowing coefficient an order of magnitude higher.
Ph. D.
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Fernandes, Rita. "Efficient Volvo Bus Cooling System,Using Electrical Fans : A comparison between hydraulic and electrical fans." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-155901.

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Economical and environmental factors together with energy policies towards more efficient systemsare the driving force for the development of the vehicle industry. Significant changes have beenmade to fulfill new emissions legislation but the basic internal combustion vehicle architecture hasbeen kept. New emission treatment systems that increase the thermal loading of the cooling systemhad been added within the same package envelope as before, which means less space to place coolingfans and a greater need for airflow. Changes in the cooling system, namely the replacement of thehydraulic fan drive system by electrical fans is one of the energy efficient alternatives for severalcity buses under certain environments, like the ”typical red city buses”, well-known in the UnitedKingdom. In this thesis study, hydraulic fans are compared with electrical fans and a road-mapof the benefits and drawbacks of the two systems is developed, based on real traffic performanceperformance data and the results of existing simulations and tests. In addition, new simulations arepresented in order to find the most efficient design for the cooling system as well as a comparisonof these results with previous ones. This road map will be used later by Volvo-Buses Group as atool to better understand in which circumstances electrical fans can be beneficial, in terms of fuelconsumption, noise production, cooling performance, control of the fans and associated costs.
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Books on the topic "Shrouded fan"

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Morris, Vera. Great Shroud: A Gripping and Addictive Murder Mystery Perfect for Crime Fiction Fans. Headline Publishing Group, 2021.

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Bonini Baraldi, Filippo. Roma Music and Emotion. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190096786.001.0001.

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By combining long-term field research with hypotheses from the cognitive sciences, this book proposes a groundbreaking anthropological theory on the emotional power of music. It hig hlights a human tendency to engage in empathic relations through and with the musical artifacts, veritable “sonic agents” for which we can feel pity, compassion, or sympathy. The theory originates from a detailed ethnography of the musical life of a small Roma community of Transylvania (Romania), where Filippo Bonini Baraldi lived several years, seeking an answer to intriguing questions such as: Why do the Roma cry while playing music? What lies behind their ability to move their customers? What happens when instrumental music and wailing voices come together at funerals? Through the analysis of numerous weddings, funeral wakes, community celebrations, and intimate family gatherings, the author shows that music and weeping go hand in hand, revealing fundamental tensions between unity and division, life and death, the self and others—tensions that the Roma enhance, overemphasize, and perceive as central to their identity. In addition to improving our understanding of a community still shrouded in stereotypes, this book is an important contribution for research on musical emotion, which thus far has focused almost exclusively on western classical music.
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Rollinger, Robert, and Julian Degen, eds. The World of Alexander in Perspective. Contextualizing Arrian. Harrassowitz Verlag, 2022. http://dx.doi.org/10.13173/9783447119085.

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This volume is a collection of papers that have been given at an international conference in December 2019 in Bregenz, Austria. They focus on Arrian of Nicomedia’s Anabasis Alexandrou which is our main source for the life and reign of Alexander the Great. So far, scholarship has paid only little attention to the Anabasis as literary cosmos of its own right. The various contributions critically evaluate the still extant general opinion, that Arrian deserves a distinguished status as the main source on the Macedonian conqueror since he allegedly closely followed his sources. But the first accounts of the participants in Alexander’s famous expedition have only survived as fragments and thus their literary production is more or less shrouded in mystery. Hence, the tension between Arrian’s literary creativity, propinquity to his sources, his relationship to his role-model Xenophon merits serious examination when assessing the value of his work as a historical source. The volume is the first attempt to contextualize the work of Arrian against various backdrops. This includes the reign of Alexander, the Classical and contemporary literary trends, the Second Sophistic as intellectual framework, the until yet neglected idea of "empire" as well as echoes and stimuli from the Achaemenid and Hellenistic period. The various contributions create a more complex image of Arrian as an author, his literary production and his idea of the Macedonian conqueror that helps us to gain a better understanding of this complex text and Alexander the Great as its protagonist.
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Fonteyn, Lauren. Categoriality in Language Change. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190917579.001.0001.

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This study presents the first elaborate attempt to set out a functional-semantic definition of diachronic transcategorial shift between the major classes “noun”/“nominal” and “verb”/“clause.” In English, speakers have different options to refer to an event by using “deverbal nominalization” strategies (e.g., Him guessing her size/His guessing of her size (was incredibly lucky)). Interestingly, not only do these strategies each resemble “prototypical” nominals to varying extents, it also has been observed that some of these strategies increasingly resemble clauses and decreasingly resemble prototypical nominals over time, as if they are gradually shifting categories. Thus far, the literature on such cases of diachronic categorial shift has mainly described the processes by focusing on form, leaving the reader with a clear picture of what and how changes have occurred. Yet, the question of why these formal changes have occurred is still shrouded in mystery. This study tackles this mystery by showing that the diachronic processes of nominalization and verbalization can also involve functional-semantic changes. The aim of this study is both theoretical and descriptive. The theoretical aim is to present a model that allows one to study diachronic nominalization and verbalization as not just formal or morpho-syntactic but also functional-semantic processes. The descriptive aim is to offer “workable” definitions of the abstract functional-semantic properties of nominals and verbs/clauses, and subsequently apply them to one of the most intriguing deverbal nominalization systems in the history of English: the English gerund.
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Book chapters on the topic "Shrouded fan"

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Kamberov, Konstantin, Blagovest Zlatev, and Todor Todorov. "Design Development of a Car Fan Shroud Based on Virtual Prototypes." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 309–17. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23976-3_27.

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Mazzoli, Roberto, and Enrica Pessione. "Ancient Textile Deterioration and Restoration: Bio-Cleaning of an Egyptian Shroud Held in the Torino Museum." In Microorganisms in the Deterioration and Preservation of Cultural Heritage, 199–216. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69411-1_9.

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AbstractAncient textiles are fragile and several factors can affect their integrity. In the present chapter, the main agents of deterioration of old and new textiles, namely physical-chemical (light, oxygen, heat, and humidity) and biological factors as well as human erroneous interventions will be explored. As far as the biological deterioration is considered, the effects of microbial growth, primary and secondary metabolites (acids, solvents, surfactants, pigments) and enzymes (lipases, proteases, and glycosidases) on textile strength and cleanliness will be described in details. The main fungal and bacterial species involved in the damage (textile discoloration, black and green spots, cuts) will be reported. Adhesive application during restoration procedures is discussed to highlight the risk of glue thickening giving rise to dull precipitates on the fabric.The main strategies for oil-stain and glue removal (both animal glue, such as fish collagen, and vegetal glue, i.e. starch) will be described in the paragraph devoted to biorestoration. Finally, a case study concerning an ancient Coptic tunic housed in the Egyptian Museum of Torino, Italy, and biocleaned by means of gellan-immobilized alpha-amylase from Bacillus sp. will be largely discussed by reporting historical data, adhesive characterization, methods for artificial aging of simulated sample and glue removal from the artwork.
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Srivastava, Aditya, and Kalpna Katiyar. "The Ecology of Bioluminescence." In Bioluminescence [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96636.

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Bioluminescence, or the ability to emit light biologically, has evolved multiple times across various taxa. As fascinating as the phenomenon is, various studies have been undertaken to harness this phenomenon for human use. However, the origins, distribution and ecology of bioluminescence still remain obscure. The capability to produce biological light is found in various species, ranging from tiny bacteria to huge fishes like lantern sharks. Many organisms that do not possess this ability partake in symbiotic relationships, resulting in a variety of anatomical and behavioral modifications. The ecological interactions resulting from bioluminescence are even more interesting and diverse, but many of them are still shrouded in mystery because of a lack of in-situ study. As agreed by many, bioluminescence conferred certain evolutionary advantages which still remain unclear. In spite of the lack of understanding, many spectacular ecological interactions like offence, defense, courtship or intra-specific synchrony have been observed, studied and documented, and their significance understood. As far as humans are concerned, efforts are being made to channel this capability to the best of our use, though some of these are still in their infancy. This chapter explores the origins, ecology and future prospects of bioluminescence in detail.
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Grossberg, Stephen. "From Seeing and Reaching to Hearing and Speaking." In Conscious Mind, Resonant Brain, 404–79. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190070557.003.0012.

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This far-ranging chapter provides unified explanations of data about audition, speech, and language, and the general cognitive processes that they specialize. The ventral What stream and dorsal Where cortical stream in vision have analogous ventral sound-to-meaning and dorsal sound-to-action streams in audition. Circular reactions for learning to reach using vision are homologous to circular reactions for learning to speak using audition. VITE circuits control arm movement properties of synergy, synchrony, and speed. Volitional basal ganglia GO signals choose which limb to move and how fast it moves. VAM models use a circular reaction to calibrate VITE circuit signals. VITE is joined with the FLETE model to compensate for variable loads, unexpected perturbations, and obstacles. Properties of cells in cortical areas 4 and 5, spinal cord, and cerebellum are quantitatively simulated. Motor equivalent reaching using clamped joints or tools arises from circular reactions that learn representations of space around an actor. Homologous circuits model motor-equivalent speech production, including coarticulation. Stream-shroud resonances play the role for audition that surface-shroud resonances play in vision. They support auditory consciousness and speech production. Strip maps and spectral-pitch resonances cooperate to solve the cocktail party problem whereby humans track voices of speakers in noisy environments with multiple sources. Auditory streaming and speaker normalization use networks with similar designs. Item-Order-Rank working memories and Masking Field networks temporarily store sequences of events while categorizing them into list chunks. Analog numerical representations and place-value number systems emerge from phylogenetically earlier Where and What stream spatial and categorical processes.
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Steinberg, Paul F. "Keep the Change." In Who Rules the Earth? Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199896615.003.0015.

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On a fall morning in 1980, Pitzer College freshman George Somogyi walked out of his dormitory, looked up, and froze in his tracks. In front of him was something incredible. An enormous mountain, over 10,000 feet tall, stretched up to the sky in the near distance. What made this sight so bizarre is that the mountain wasn’t there before. Somogyi had been at college for three months and had never laid his eyes on Mount Baldy, a five-million-year-old formation that stands just a few miles from this campus on the eastern edge of Los Angeles County, because it was shrouded in smog so thick that it obscured the view for months at a time. Air pollution is a problem well known to the people of Los Angeles. In the 1970s their city became an icon of urban air pollution, as photos of brown haze choking downtown LA circulated worldwide. The air was so hazardous that people were hospitalized by the thousands. Yet today the air around Los Angeles, while far from perfect, is markedly improved. The amount of smog has been sliced in half since the 1970s, even as the population has doubled in size. More impressive still, the amount of particulate pollution—the small dust particles that lodge deep in the lungs and are especially harmful to human health—has been reduced to one-fifth the levels experienced in 1955. How did a change of this magnitude come about? This physical transformation was precipitated by a political transformation, as the people of Los Angeles joined together and fought for new rules to clean up the air. Beginning in the 1940s, citizens demanded that city officials look into the causes of the problem, which were not obvious at the outset. Their efforts led to the creation of the Los Angeles Bureau of Smoke Control in 1945. Soon the movement spread throughout California, where in 1947 state legislators passed the Air Pollution Control Act—a full quarter century before national policymakers adopted similar legislation.
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Conference papers on the topic "Shrouded fan"

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Wadia, A. R., and P. N. Szucs. "Inner Workings of Shrouded and Un-Shrouded Transonic Fan Blades." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90992.

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This paper reports on the numerical assessment of the differences in aerodynamic performance between part span shrouded and un-shrouded fan blades generally found in the first stage of multi-stage fans in low bypass ratio aircraft engines. Rotor flow fields for both blade designs were investigated at two operating conditions using a three-dimensional viscous flow analysis. Although designed to the same radius ratio, aspect ratio and solidity, the un-shrouded fan rotor had a slightly increased tip speed (+3%) and somewhat lower pressure ratio (-3.2%) due to engine cycle requirements. Even when allowing for these small differences, the analysis reveals interesting differences in the level and in the radial distribution of efficiency between these two rotors. The reason for the improved performance of the shrouded rotor in part can be attributed to the shroud blocking off the radial migration of boundary layer fluid centrifuged from the hub on the suction side. As a result, the shock boundary layer interaction seems to be improved on the shrouded blade. At the cruise condition, the efficiency is the same for both rotors. The slightly better efficiency of the shrouded blade in the outer panel is nullified by the large efficiency penalty in the vicinity of the shroud. As there is no significant radial migration of fluid in the suction side boundary layer as indicated by the analysis at this condition relative to the design speed case; the benefit due to the shroud is greatly reduced. At this speed and at lower speeds the shroud becomes a net additional loss for the blade. Also of interest from the numerical results, is the indication that significant blade ruggedization penalties to performance can be reduced in the case of the un-shrouded blade through custom tailoring of its mean camber line.
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Kondor, Shayne, Bob Englar, Warren Lee, and Mark Moore. "Experimental Investigation of Circulation Control on a Shrouded Fan." In 21st AIAA Applied Aerodynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3409.

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Kondor, Shayne. "Further Experimental Investigations of Circulation Control Morphing Shrouded Fan." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-639.

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Avanzini, Giulio, Salvatore D'Angelo, and Guido De Matteis. "Development of a Shrouded-Fan UAV for Environmental Monitoring." In AIAA 3rd "Unmanned Unlimited" Technical Conference, Workshop and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-6383.

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Prakash, Raghu, Hithesh Channegowda, and Anandavel Kaliyaperumal. "A Study on Bird Impact Damages on Shrouded Fan Blades of an Aero-Engine." In ASME 2013 Gas Turbine India Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gtindia2013-3804.

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Aero-engine fan blades are the critical components that are vulnerable to Foreign Object Damage (FOD) such as bird impact. The thrust loss due to bird impact can affect engine core function, resulting in catastrophic failure. The fan blades should be designed to have adequate resistance to bird impact. The present paper focuses on numerical evaluation of bird impact response on shrouded and un-shrouded rotating set of fan blades using three dimensional computational methodology. The impact response is compared between shrouded and un-shrouded blades in terms of deformation, von-Mises stress, plastic strain, and energy absorbed. Numerical analysis results indicate that the shrouded fan blade absorbs 35 % more energy compared to un-shrouded blade. Deformation damage at impact location of shrouded blade is lesser compared to un-shrouded blade. The maximum plastic strain observed on shrouded blade due to bird impact is also 50 % lesser than the un-shrouded blade. The study suggests that the shrouded fan blades provide better impact resistance characteristics to bird impact compared to un-shrouded fan blades.
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Avanzini, Giulio, Guido De Matteis, and Francesco Fresta. "Robust Multivariable Control of a Shrouded-Fan Uninhabited Aerial Vehicle." In AIAA Atmospheric Flight Mechanics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-4703.

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Johnson, Graham, Kathy Simmons, and Colin Foord. "Experimental Investigation Into Windage Power Loss From a Shrouded Spiral Bevel Gear." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27885.

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In some aero-engine applications a spiral bevel gear is mounted in a bearing chamber. The windage power losses (WPL) associated with the gear make a significant contribution to the overall heat generation within the bearing chamber and a potential method of WPL reduction and lubrication/cooling oil management is to shroud the gear. At the University of Nottingham Technology Centre in Gas Turbine Transmission Systems experimental and computational techniques are being applied to enhance understanding of shroud performance and design. This paper presents results from the first stage of the investigation in which the windage losses associated with rotating an unmeshed spiral bevel gear in air have been studied. The potential to reduce gear WPL by shrouding is clearly demonstrated with the WPL for the shrouded gear reduced on average by 75% for clockwise rotation and by 70% for anticlockwise rotation. Given the physical similarity between a shrouded gear and a centrifugal fan an attempt was made to characterize the performance of the shrouded gear in a similar manner to that used for a centrifugal fan i.e. as a function of the mass flow rate of air flowing through the shroud. It is demonstrated that in many aspects the gear performance was analogous to centrifugal fan behavior. It is further demonstrated that fan design approaches could be adopted to inform the detail of the shroud design and to translate test rig performance to different operating conditions.
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Avanzini, Giulio, Salvatore D'Angelo, and Guido De Matteis. "Modelling and Simulation of a Shrouded-Fan UAV for Environmental Monitoring." In 1st UAV Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3464.

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Battiston, Andrea, Andrea Magrini, Rita Ponza, and Ernesto Benini. "Fullscale Optimization and Fan Design of a Rear BLI Shrouded Propulsor." In AIAA SCITECH 2023 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-1640.

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10

Yajie, Shi, Hong Jie, Shan Yingchun, and Zhu Zigen. "Forced Response Analysis of Shrouded Blades by an Alternating Frequency/Time Domain Method." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90595.

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Abstract:
In turbine jet engine, the rotating blades are subjected to cyclic loading, which makes the blades experience the so-called High Cycle Fatigue (HCF). Dry friction is often employed in turbine design to attenuate the blade vibration and increase aeroclastic stability of the turbine. The dry friction dampers are often classified into four types, i.e., blade-to-blade, blade-to-ground, shrouds, and wedge damper, respectively. Compared with the under-platform dampers, shrouds make fan behavior be significantly more complex. It is very difficult to model and predict the nonlinear response of shrouded blades. In the present study, an efficient approach to investigate the nonlinear response of the shrouded blades is suggested using an alternating frequency/time domain (AFT) method. On one hand, the friction force between shrouds is numerically solved in time-domain. The trajectory of relative motion of the moving contact point is traced, and the stick-slip-separation transition for 3-D relative motion of the shroud-contact interface is considered. On the other hand, the response of the shrouded blades is iteratively solved in frequency-domain using Harmonic Balance Method (HBM). In this approach, the influence of high frequency modes of blade, and the coupling of each harmonic component on damping behavior can be taken into account. As an application, the performance of shroud damper is systematically investigated using the AFT method. The influence of shroud-to-shroud preload and contact stiffness on the shroud damping potential is studied. Some valuable results are got to the design of the shroud contact.
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Reports on the topic "Shrouded fan"

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Zheng, Wanzheng, and Jason Merret. Aerodynamic Survey of Novel eVTOL Configuration Using SU2. Illinois Center for Transportation, August 2022. http://dx.doi.org/10.36501/0197-9191/22-014.

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Abstract:
This report summarizes computational fluid dynamics (CFD) results of electric vertical takeoff and landing (eVTOL) geometries using the SU2 Reynolds-averaged Navier-Stokes (RANS) solver. Geometries were generated based on the Smart Transportation Infrastructure Initiative (STII) Rappor 15th iteration with various rotor-installment solutions. It was found that although open rotors installed on an underwing pylon were superior to shrouded rotors installed in a canoe, the canoe configuration would provide more potential for improvement, and using a canoe door to cover the first rotor opening would reduce the drag experienced by the canoe case below that upon the rod case. Rotor doors were found to be most efficient in reducing drag of the canoe case: Average drag reduction with covering the first rotor and all rotors was 66 and 165 counts, respectively. Changing rotor distributions along the chordwise direction had minimal impact on drag reduction, and placing rotors along the spanwise direction was not advised due to the increase of the projected frontal area. Increasing canoe chord length did not have significant impact on drag reduction; and if rotor doors were implemented, increasing canoe size had negative impact on drag. Rounding rotor edges did not change the aerodynamic performance of the canoe case but promotes vertical air intake when running lifting fans. Drag received by the canoe parabolically correlated to rotor diameter, with 126 counts of drag if the rotor diameter was 0 and 377 counts if the rotor diameter was 2.95 ft. Fuselage and tail added an average 179 counts of drag, and thus the aforementioned differences were still significant in the scale of aerodynamic properties of the full configuration.
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