Relevant bibliographies by topics / Tip speed ratio

Contents

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

Academic literature on the topic 'Tip speed ratio'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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Journal articles on the topic "Tip speed ratio"

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Wang, Hao, Bing Ma, and Jiao Jiao Ding. "The Analysis of the Flutter Region of Wind Turbine Blade." Applied Mechanics and Materials 423-426 (September 2013): 1520–23. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1520.

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As the wind turbine blade is becoming larger and larger, the flutter of the wind turbine blade has been paid great attention by many fields. The flutter region of the wind turbine blade airfoil was focused on. The equation of motion for the flutter of blade airfoil was established, based on the simplified aerodynamic force and torque. The flutter analysis of wind turbine blade was carried out with the four-order Runge-Kutta methods, and so the flutter region of the blade airfoil can be obtained. The results show that, there are two critical tip speed ratios for the given blade airfoil. When the tip speed ratio is below the low critical speed ratio, the blade airfoil is convergent. At the low tip speed ratio, the blade airfoil system will become divergent from convergent condition. When the tip speed ratio is between the low critical tip speed ratio and the high one, the blade airfoil system will diverge. At the high tip speed ratio, the system will become convergent from divergent condition. When the tip speed ratio is above the high critical tip speed ratio, the blade airfoil system will converge again. In addition, the torsional angular displacement and velocity always keep convergent, the flap velocity is slightly divergent, because they are not sensible to the change of the tip speed ratio, and they are difficult to cause flutter, so the torsional motion will be more stable than flap motion for the given blade airfoil. It can provide one of references for the determination of the blade airfoil.
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Hosseini, Amir, Daniel Trevor Cannon, and Ahmad Vasel-Be-Hagh. "Tip Speed Ratio Optimization: More Energy Production with Reduced Rotor Speed." Wind 2, no. 4 (2022): 691–711. http://dx.doi.org/10.3390/wind2040036.

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A wind turbine’s tip speed ratio (TSR) is the linear speed of the blade’s tip, normalized by the incoming wind speed. For a given blade profile, there is a TSR that maximizes the turbine’s efficiency. The industry’s current practice is to impose the same TSR that maximizes the efficiency of a single, isolated wind turbine on every turbine of a wind farm. This article proves that this strategy is wrong. The article demonstrates that in every wind direction, there is always a subset of turbines that needs to operate at non-efficient conditions to provide more energy to some of their downstream counterparts to boost the farm’s overall production. The aerodynamic interactions between the turbines cause this. The authors employed the well-known Jensen wake model in concert with Particle Swarm Optimization to demonstrate the effectiveness of this strategy at Lillgrund, a wind farm in Sweden. The model’s formulation and implementation were validated using large-eddy simulation results. The AEP of Lillgrund increased by approximately 4% by optimizing and actively controlling the TSR. This strategy also decreased the farm’s overall TSR, defined as the average TSR of the turbines, by 8%, leading to several structural and environmental benefits. Note that both these values are farm-dependent and change from one farm to another; hence, this research serves as a proof of concept.
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K, Suja. "Extracting Maximum Power from Wind Turbine Using Tip Speed Ratio and PO Algorithms by Limiting the Wind Speed." Revista Gestão Inovação e Tecnologias 11, no. 4 (2021): 1241–51. http://dx.doi.org/10.47059/revistageintec.v11i4.2183.

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Çetin, N., M. Yurdusev, R. Ata, and A. Özdamar. "Assessment of Optimum Tip Speed Ratio of Wind Turbines." Mathematical and Computational Applications 10, no. 1 (2005): 147–54. http://dx.doi.org/10.3390/mca10010147.

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Wood, D. H. "Maximum wind turbine performance at low tip speed ratio." Journal of Renewable and Sustainable Energy 7, no. 5 (2015): 053126. http://dx.doi.org/10.1063/1.4934805.

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Manwell, James F., and Robert H. Kirchhoff. "Wind energy from turbulence: Constant tip speed ratio operation." Solar Energy 34, no. 1 (1985): 59–67. http://dx.doi.org/10.1016/0038-092x(85)90092-1.

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Tan, Zong Qi, Can Can Li, Hui Jun Ye, Yu Qiong Zhou, and Hua Ling Zhu. "The Rotor Speed Control of 5MW Wind Turbine under Rated Wind Speed Using Adaptive-PID Controller." Applied Mechanics and Materials 229-231 (November 2012): 2323–26. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2323.

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This paper designed the controller of the wind turbine rotor rotating speed. This model of adaptive-PID through control the tip-speed ratio and count the values of PID for variable wind speed. From the result of simulation, the wind speed can run in a good dynamic characteristic, and keep the rotor running in the best tip-speed ratio at the same time.
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Hendler, J., W. Flowers, and A. Bell. "Windmill Tip-Speed Ratio Regulation Using an Impedance-Matching Control System." Journal of Solar Energy Engineering 107, no. 4 (1985): 326–34. http://dx.doi.org/10.1115/1.3267701.

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A discussion of the approaches to, and benefits of, windmill tip-speed ratio (TSR) control is presented. Rotational speed regulation via load-controlled impedance matching is identified as the most efficient control method. An all-mechanical, self-powered windmill TSR controller using this method is presented with a discussion of its operation and wind tunnel test results. The controller, which is applicable to a variety of windmill/load combinations, also provides for rotor start-up and for shutdown in high winds. A design methodology is presented and used to design a controller for a windmill driving an electrical generator and for the same windmill driving a water pump. These designs are verified with a digital computer simulation using real wind data. The TSR controller regulated windmill speed for efficient operation at all wind speeds, limited only by the power rating of the windmill and load machinery. The simulation results also demonstrate the economic feasibility of the system.
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Suzuki, Hiroki, Yutaka Hasegawa, O. D. Afolabi Oluwasola, and Shinsuke Mochizuki. "Attempt to quantify the impact of seasonal air density variation on operating tip-speed ratio of small wind turbines." Journal of Physics: Conference Series 2090, no. 1 (2021): 012144. http://dx.doi.org/10.1088/1742-6596/2090/1/012144.

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Abstract This study presents the impact of seasonal variation in air density on the operating tip-speed ratio of small wind turbines. The air density, which varies depending on the temperature, atmospheric pressure, and relative humidity, has an annual amplitude of about 5% in Tokyo, Japan. This study quantified this impact using the rotational speed equation of motion in a small wind turbine informed by previous work. This governing equation has been simplified by expanding the aerodynamic torque coefficient profile for a wind turbine rotor to the tip-speed ratio. Furthermore, this governing equation is simplified by using nondimensional forms of the air density, inflow wind velocity, and rotational speed with their characteristic values. In this study, the generator’s load is set to be constant based on a previous analysis of a small wind turbine. By considering the equilibrium between the aerodynamic torque and the load torque of the governing equation at the optimum tip-speed ratio, the impact of the variation in the air density on the operating tip-speed ratio was expressed using a simple mathematical form. As shown in this derived form, the operating tip-speed ratio was found to be less sensitive to a variation in air density than that in inflow wind velocity.
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Chen, Qiu Hua, Xu Lai, and Jin Zou. "SPIV Analysis of the Tip Vortex Evolution of a Horizontal Axis Wind Turbine." Advanced Materials Research 860-863 (December 2013): 256–61. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.256.

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The present paper evaluates the tip vortex evolution of a horizontal axis wind turbine model using the stereo particle image velocimetry technology. The measurements of the wake region up to 2.7 diameters downstream are first conducted using the phase locked technique based on two high speed CCD cameras. Parameters that describe the helical vortex wake, such as the velocity, helicoidal pitch and vortex vorticity, are presented at two tip speed ratios. The vortex interaction and stability of helical vortex filaments within wind turbine wake are seen throughout the measurement domain. The results show the wake structure varies with tip speed ratio, and the helicoidal pitch of tip vortex trajectory reduces while the diffusion of tip vortex is faster with increasing tip speed ratio.
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Dissertations / Theses on the topic "Tip speed ratio"

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Nicholas, Allen Christo. "A stochastic analysis of Turbulence Intensity influence over various sizes of HAWT : Study of hypothetical relationship between Rotor Diameter and influence level of Turbulence Intensity." Thesis, Högskolan i Halmstad, Energivetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31096.

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This disquisition aims for the study of turbulence intensity influence over the power performance of different sizes of turbines with the intent to validate a hypothesis. The hypothesis formulated for the analysis is the relationship between the rotor diameter (turbine size) and turbulence intensity. The hypothetical relationship is that the smaller turbines tend to experience more influence on the power performance from the turbulence in comparison with larger ones. For this examination, three different wind turbines of models Vestas V90, V100, V126 were chosen from three Swedish wind farms. The power performance of turbines at various levels of turbulence intensity were analyzed and the power deviation from the mean value due to influence of turbulence were assessed. The power deviation values of different turbines were compared at same level of wind speeds and also the power coefficients at same level of tip speed ratios were compared to validate the hypothesis. It was observed that the hypothesis seemed to appear true as higher influence on power curves were observed on V90 compared to others. Nevertheless, there were some obscene results which might be due to several factors such as influence of variation in hub height, site and inadequacy of data.<br>Detta examensarbete syftar till att studera hur ett vindkraftverks storlek påverkar inflytande från turbulens på effektuttaget. Hypotesen är att vindkraftverk med mindre rotordiameter påverkas mer av turbulens än de större. Tre vindkraftverksmodeller (Vestas V90, V100 och V126) från svenska vindkraftsparker valdes ut. De olika modellernas effektuttag för olika grader av turbulens analyserades och avvikelsen från effektmedelvärdet jämfördes. Effektavvikelserna samt verkningsgradsavvikelsen  för de olika vindkraftverksmodellerna jämfördes vid samma vindhastighet respektive löptal för att kunna testa hypotesen. Hypotesen styrks då den mista modellen (Vestas V90) påverkas mest av turbulens. Resultatet har dock troligtvis påverkats av andra faktorer såsom tornhöjd, terräng och en begränsad mängd data.
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Kjellin, Jon. "Vertical Axis Wind Turbines : Electrical System and Experimental Results." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-182438.

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The wind power research at the division of Electricity at Uppsala University is aimed towards increased understanding of vertical axis wind turbines. The considered type of wind turbine is an H-rotor with a directly driven synchronous generator operating at variable speed. The experimental work presented in this thesis comprises investigation of three vertical axis wind turbines of different design and size. The electrical, control and measurement systems for the first 12 kW wind turbine have been designed and implemented. The second was a 10 kW wind turbine adapted to a telecom application. Both the 12 kW and the 10 kW were operated against dump loads. The third turbine was a 200 kW grid-connected wind turbine, where control and measurement systems have been implemented. Experimental results have shown that an all-electric control, substituting mechanical systems such as blade-pitch, is possible for this type of turbine. By controlling the rectified generator voltage, the rotational speed of the turbine is also controlled. An electrical start-up system has been built and verified. The power coefficient has been measured and the stall behaviour of this type of turbine has been examined. An optimum tip speed ratio control has been implemented and tested, with promising results. Use of the turbine to estimate the wind speed has been demonstrated. This has been used to get a faster regulation of the turbine compared to if an anemometer had been used.
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Berkesten, Hägglund Patrik. "An Experimental Study on Global TurbineArray Eects in Large Wind Turbine Clusters." Thesis, KTH, Mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202630.

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It is well known that the layout of a large wind turbine cluster aects the energyoutput of the wind farm. The individual placement and distances betweenturbines will in uence the wake spreading and the wind velocity decit. Manyanalytical models and simulations have been made trying to calculate this, butstill there is a lack of experimental data to conrm the models. This thesis isdescribing the preparations and the execution of an experiment that has beenconducted using about 250 small rotating turbine models in a wind tunnel. Theturbine models were developed before the experiment and the characteristicswere investigated. The main focus was laid on special eects occurring in largewind turbine clusters, which were named Global Turbine Array Eects.It was shown that the upstream wind was little aected by a large windfarm downstream, even though there existed a small dierence in wind speedbetween the undisturbed free stream and the wind that arrived to the rstturbines in the wind farm. The dierence in wind speed was shown to beunder 1% of the undisturbed free stream. It was also shown that the densityof the wind farm was related to the reduced wind velocity, with a more densefarm the reduction could get up to 2.5% of the undisturbed free stream at theupstream center turbine. Less velocity decit was observed at the upstreamcorner turbines in the wind farm.When using small rotating turbine models some scaling requirements hadto be considered to make the experiment adaptable to reality. It was concludedthat the thrust coecient of the turbine models was the most important parameterwhen analysing the eects. One problem discussed was the low Reynoldsnumber, an eect always present in wind tunnel studies on small wind turbinemodels.A preliminary investigation of a photo measuring technique was also performed,but the technique was not fully developed. The idea was to take oneor a few photos instantaneously and then calculate the individual rotationalspeed of all the turbine models. It was dicult to apply the technique becauseof uctuations in rotational speed during the experiment, therefore thecalculated values could not represent the mean value over a longer time period.
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Wang, Yuchen. "Blade Design of Vertical Axis Wind Turbine at Low Tip-speed-ratios." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524224348317784.

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Jami, Valentina. "Development of Computer Program for Wind Resource Assessment, Rotor Design and Rotor Performance." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513703072278665.

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Oljelund, David. "Dimensionering och konstruktion av passiv mekanisk pitch för småskaliga horisontalaxlade vindkraftverk." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-42348.

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För vindkraftverk i mindre skala används i huvudsak två sätt att avlasta vid höga vindhastigheter, stallreglering och girning ur vind. En tredje metod är att pitcha rotorbladet till en mindre attackvinkel. Då minskar belastningen på rotorbladet samtidigt som effektgenerering kan bibehållas. Arbetet redovisar en konstruktion för en fjädrande passiv mekanisk pitch som avgränsats till att enbart dimensionera en vridfjäder och tre lager. Konstruktionen riktas mot horisontalaxlade vindkraftverk med tre rotorblad med en rotordiameter upp till 20m. Ett idealt rotorblad modelleras matematiskt för att ta fram dimensionerande krafter och moment. Utifrån detta kan sedan vridfjäder och lager dimensioneras. Konstruktionen tillsammans med dimensioneringen visar att belastning av rotorbladet kan reduceras samt att krafter som är kopplad till effekten kan hållas mer eller mindre konstant för vindhastigheter 16 till 24 m/s. Resultat av dimensionering visar att både vridfjäder och lager kan relativt enkelt anpassas till olika axeldiametrar. Slutsatserna blir att om dimensionering görs enligt arbetet är det, åtminstone i teorin, möjligt att uppnå det önskade beteendet för pitchen. För vidare arbete och verifiering rekommenderas bland annat att göra reella tester för vridfjädern för att bestämma dess precision på grund av fjäderns små vinkelutslag.<br>For small-scale wind turbines, there are mainly two ways of reducing loads at high wind speeds, stall regulation and yaw the rotor out of wind. A third method is to pitch the rotor blade to a smaller angle of attack. This reduces the load on the rotor blade while maintaining power generation. The following work presents a design for a spring based passive mechanical pitch that is limited to only dimensioning a torsion spring and three bearings. The design is aimed at horizontal axis wind turbines with three rotor blades with a rotor diameter up to 20m. An ideal rotor blade is mathematically modeled to produce the forces and torques needed in order to properly dimension the torsion spring and bearings. The design shows that the load of the rotor blade can be reduced and that forces connected to the power can be kept more or less constant for wind speeds 16 to 24 m / s. The results of sizing show that both the torsion spring and bearings can be adapted to different shaft diameters relatively easy. The conclusions are that if dimensioning is done according to the presented results, it is possible, at least in theory, to achieve the desired behaviour. For further development and verification it is recommended to do real tests for the torsion spring to determine its precision due to small angle displacement in the spring.
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Kavický, Martin. "Analýza vlivu velikosti okna a zpoždění na efektivitu TCP spojení." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218327.

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Content of master’s thesis is description field of Sliding window and it’s expansion algorithms, witch are Slow start, Congestion avoidance, Fast Retransmit and Fast Recovery algorithm. Thereinafter is described creation of model in Opnet Modeler’s simulation area. In this simulation area was analyzed reactions of average transfer speed onto variance of data size, lost ratio, latency in short and long time slot and variance of receiver’s buffer size. In last section of this document is method design witch makes it possible of transfer speed control through the use of receiver’s buffer size dynamic setting.
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SAMADDER, SOUVIK. "A NUMERICAL STUDY ON COMBINED EFFECT OF DEFLECTOR PLATE, TWIST ANGLE OF BLADES, AND TIP SPEED RATIO ON THE PERFORMANCE OF SAVONIUS HYDROKINETIC TURBINE." Thesis, 2022. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19132.

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Savonius Hydrokinetic Turbine (SHT) is a small-scale renewable energy source that is a sustainable solution for remote areas and rural electrification. The current research work establishes a numerical study on combined effect of deflector plate (no deflector, deflector at 90°, deflector at 45°), twist angle of blades (0°, 12.5°, 25°), and tip speed ratio (0.5 to 1.5) on the turbine efficiency in terms of power coefficient (Cp) using CFD simulation considering a realizable k-ε turbulence model. A total of 99 simulations were performed considering all the above different conditions. To validate the results, simulations were compared with the results of a previous study having no deflector plate. It has been identified that SHT with blade twist angle of 12.5° and deflector plate at 90° produces highest power coefficient as 0.364 at tip speed ratio of 0.9 and 0.5 m/s water velocity. Similarly, SHT having a blade twist angle of 25° with deflector plate at 90° yields the highest torque coefficient as 0.454 at a TSR of 0.5. It was observed that Cp increases by an average 15% for SHT having blade twist and deflector plate as compared to SHT without blade twist and deflector plate.
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Che-MingHsu and 許哲銘. "Characteristics of miniature turbine wakes under different tip speed ratios in the freestream flow condition." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/53zt6a.

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Jing-WeiFang and 方經緯. "Simulation of wake characteristics of horizontal axis miniature wind turbine operating different tip speed ratios." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/66tsxz.

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Books on the topic "Tip speed ratio"

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Yang, Kun. Observed Regional Climate Change in Tibet over the Last Decades. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.587.

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The Tibetan Plateau (TP) is subjected to strong interactions among the atmosphere, hydrosphere, cryosphere, and biosphere. The Plateau exerts huge thermal forcing on the mid-troposphere over the mid-latitude of the Northern Hemisphere during spring and summer. This region also contains the headwaters of major rivers in Asia and provides a large portion of the water resources used for economic activities in adjacent regions. Since the beginning of the 1980s, the TP has undergone evident climate changes, with overall surface air warming and moistening, solar dimming, and decrease in wind speed. Surface warming, which depends on elevation and its horizontal pattern (warming in most of the TP but cooling in the westernmost TP), was consistent with glacial changes. Accompanying the warming was air moistening, with a sudden increase in precipitable water in 1998. Both triggered more deep clouds, which resulted in solar dimming. Surface wind speed declined from the 1970s and started to recover in 2002, as a result of atmospheric circulation adjustment caused by the differential surface warming between Asian high latitudes and low latitudes.The climate changes over the TP have changed energy and water cycles and has thus reshaped the local environment. Thermal forcing over the TP has weakened. The warming and decrease in wind speed lowered the Bowen ratio and has led to less surface sensible heating. Atmospheric radiative cooling has been enhanced, mainly through outgoing longwave emission from the warming planetary system and slightly enhanced solar radiation reflection. The trend in both energy terms has contributed to the weakening of thermal forcing over the Plateau. The water cycle has been significantly altered by the climate changes. The monsoon-impacted region (i.e., the southern and eastern regions of the TP) has received less precipitation, more evaporation, less soil moisture and less runoff, which has resulted in the general shrinkage of lakes and pools in this region, although glacier melt has increased. The region dominated by westerlies (i.e., central, northern and western regions of the TP) received more precipitation, more evaporation, more soil moisture and more runoff, which together with more glacier melt resulted in the general expansion of lakes in this region. The overall wetting in the TP is due to both the warmer and moister conditions at the surface, which increased convective available potential energy and may eventually depend on decadal variability of atmospheric circulations such as Atlantic Multi-decadal Oscillation and an intensified Siberian High. The drying process in the southern region is perhaps related to the expansion of Hadley circulation. All these processes have not been well understood.
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Book chapters on the topic "Tip speed ratio"

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Abo-Serie, Essam, and Elif Oran. "Flow Simulation of a New Horizontal Axis Wind Turbine with Multiple Blades for Low Wind Speed." In Springer Proceedings in Energy. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30960-1_10.

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AbstractIn this paper, a new design of a small horizontal-axis wind turbine is introduced. The design is based on the authors’ patent, which uses permanent magnets impeded into a shroud that holds the rotor blades. The generator coils are installed on a fixed diffuser that houses the rotor and acts as a wind concentrator. Therefore, the new design has no hub and is based on direct coupling for electricity generation. The main features of the design have been explored to highlight the advantages with a focus on how the new design can be integrated with the recent development of green buildings. The effect of increasing the number of blades and blade chord distribution on turbine performance has been investigated for the new turbine. Initial design and analysis were carried out using the Blade Element Momentum method and CFD simulations to identify the turbine performance and examine the flow characteristics. The results showed that further energy can be extracted from the turbine if the blade chord size increases at the shroud location and reduces at the turbine hub for a low Tip Speed Ratio TSR within the range of 1.5–3. Furthermore, having more blades can significantly increase the power coefficient and extend the range of operation with a high power coefficient. The number of blades, however, has to be optimised to achieve maximum power relative to the cost. Adding a diffuser and flanges surrounding the turbine can further increase the energy extracted from the wind at low speed.
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Branlard, Emmanuel. "Cylindrical Vortex Model of a Rotor of Finite or Infinite Tip-Speed Ratios." In Research Topics in Wind Energy. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55164-7_17.

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Bodin, Ulf, and Arne Simonsson. "Effects on TCP from Radio-Block Scheduling in WCDMA High Speed Downlink Shared Channels." In Quality for All. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-45188-4_22.

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Hosseini, Seyedvahid, Seyed Hossein Madani, Sara Hatami, et al. "Development of an Affordable MGT-CHP for Domestic Applications." In Springer Proceedings in Energy. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30960-1_33.

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AbstractThe micro gas turbine (MGT) is considered one of the main solutions for the future power generation system to provide secure and stable energy. Thanks to its multi-fuel capability and high values of power-to-weight ratio, it is a suitable candidate for many applications such as Combined Heat and Power (CHP) systems, range extenders, and auxiliary power units. Among these applications, the micro-CHP system benefits from both the electricity and exhaust heat of the MGT for household or industrial process applications. The MGT could be integrated with a heat exchanger to introduce a CHP boiler to the domestic boiler market. To reduce the cost and size of the package and to compete with a traditional boiler the simple Brayton cycle without the recuperator is considered and all of the useful energy in the exhaust gas is transferred to the heat exchanger to provide hot water. To further reduce the cost of the system to compete in the market, off-the-shelf components were adopted in this project. In this article, the development process of this product is presented including conceptual design based on the type and size of the market. It follows with an evaluation of off-the-shelf compressor and turbine modulus from the automotive turbochargers to match the operating conditions. Here, the MGT is designed in a way that can be adapted to the boilers with minimum components change. A high-speed alternator was powered with a tie grid drive/inverter to enable a bi-directional connection of the power unit to the network. A comparison between the product definition and experimental results of a demonstrator prototype is presented which reveals gaps between design and prototype outcomes. Analysis shows that 23% of the power degradation can be recovered by enhancing the cooling. Potential development and improvement scenarios are addressed for future development.
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Jayabalan, Jagan, Dalkilic Yildirim, Dookie Kim, and Pijush Samui. "Design Optimization of a Wind Turbine Using Artificial Intelligence." In Mathematical Concepts and Applications in Mechanical Engineering and Mechatronics. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1639-2.ch003.

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This chapter examines the capability of Support Vector Machine (SVM), Relevance Vector Machine (RVM) and Genetic Programming (GP) for the optimal design of wind turbine. The excellent design has been influenced by various factors, such as profile of the blade, number of blades, power factor and tip speed ratio. The key to design a wind turbine is to Assessing the optimal tip speed ratio (TSR) is the key for designing the wind turbine. This chapter handles the Artificial Intelligence techniques in predicting the optimal TSR and the power factor based on the parameters engaged for NACA 4415 and LS-1 profile types with 3 and 4 blades. The organized machine learning framework is anticipated to be lucrative than the traditional way in foretelling the TSR and power factor. The machine learning models are then compared with the existing Neural Network model and the pros and cons of the various models are inferred from the results.
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Ragheb, Magdi, and Adam M. "Wind Turbines Theory - The Betz Equation and Optimal Rotor Tip Speed Ratio." In Fundamental and Advanced Topics in Wind Power. InTech, 2011. http://dx.doi.org/10.5772/21398.

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Ramanathan, Bharat. "Fluid Dynamics Simulation of an NREL-S Series Wind Turbine Blade." In Numerical Simulation [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107013.

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Wind turbine blades are known for their complex geometry and difficult-to-predict characteristics. So, this chapter aims to look in depth at theory, design, modeling, and simulation of a 1.2 MW wind turbine blade (35 m). Computational fluid dynamics (CFD) will be used to simulate the blade. The design tip speed ratio (TSR), the center point of the design, is optimally chosen as 7. The various parameters like torque vs TSR, Cp, and Ct vs TSR will be found for varying pitch angles. Simulations will be performed on the blade, and the results will be compared with those obtained from blade element &amp; momentum (BEM) theory. Along with this, QBlade and XFoils results are compared with a much more accurate CFD simulation. To conclude, the accuracy of various methods will be compared and evaluated.
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"An Efficient Approach to Power Coefficient and Tip Speed Ratio Relationship Modeling in Maximum Power Point Tracking of Wind Power Generation." In International Conference on Software Technology and Engineering (ICSTE 2012). ASME Press, 2012. http://dx.doi.org/10.1115/1.860151_ch17.

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Bakırcı, Mehmet. "Comparison of Power Performance of Horizontal Axis Wind Turbines with NACA 4412 and NREL S809 Airfoils." In Interdisciplinary studies on contemporary research practices in engineering in the 21st century-III. Özgür Yayınları, 2023. http://dx.doi.org/10.58830/ozgur.pub130.c540.

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To investigate the power coefficient values, two different horizontal axis wind turbines were designed with the use of two airfoils; NACA 4412, NREL S 809 airfoils. These two horizontal axis wind turbine rotors designed with three blades of 40 cm radius was produced with a 3D printer. Power coefficients were calculated by measuring the torque values generated in these turbines for different tip speed ratios. The homogeneous wind obtained by a moving vehicle is used to produce artificial wind. The highest power efficiency was achieved with NACA 4412 compared to NREL S809, but the power efficiency value was higher with NREL S 809 at values greater than 9 of the tip speed ratios with NACA 4412.
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Furbish, David Jon. "Turbulent Flows." In Fluid Physics in Geology. Oxford University Press, 1997. http://dx.doi.org/10.1093/oso/9780195077018.003.0018.

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Many geological flows involve turbulence, wherein the velocity field involves complex, fluctuating motions superimposed on a mean motion. Flows in natural river channels are virtually always turbulent. Magma flow in dikes and sills, and lava flows, can be turbulent. Atmospheric flows involving eolian transport are turbulent. The complex, convective overturning of fluid in a magma chamber or geyser is a form of turbulence. Thus, a description of the basic qualities of these complex flows is essential for understanding many geological flow phenomena. Turbulent flows generally are associated with large Reynolds numbers. Recall from Chapter 5 that the Reynolds number Re is a measure of the ratio of inertial to viscous forces acting on a fluid element, . . . Re = ρUL/μ . . . . . . (14.1) . . . where the characteristic velocity U and length L are defined in terms of the particular flow system. Thus, turbulence is typically associated, for given fluid density ρ and viscosity μ, with high-speed flows (although we must be careful in applying this generality to thermally driven convective motions; see Chapter 16). A simple, visual illustration of this occurs when smoke rises from a cigar within otherwise calm, surrounding air. The smoke acts as a flow tracer. Smoke molecules at the cigar tip start from rest, since they are initially attached to the cigar. Upward fluid motion, as traced by the smoke, initially is of low speed, and viscous forces have a relatively important influence on its behavior. The flow is laminar; smoke streaklines are smooth and locally parallel. But as the flow accelerates upward, it typically reaches a point where viscous forces are no longer sufficient to damp out destabilizing effects of growing inertial forces, and the flow becomes turbulent, manifest as whirling, swirling fluid motions (see Tolkien [1937]). Throughout this chapter we will consider only incompressible Newtonian fluids. Unfortunately, the complexity of turbulent fluid motions precludes directly using the Navier–Stokes equations to describe them. Instead, we will adopt a procedure whereby the Navier–Stokes equations are recast in terms of temporally averaged or spatially averaged values of velocity and pressure, and fluctuations about these averages.
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Conference papers on the topic "Tip speed ratio"

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Rodgers, C., and D. Brown. "High Hub/Tip Ratio Centrifugal Compressors." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59012.

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During WW II the impetus of higher speed higher altitude aircraft necessitated the rapid development of advanced supercharged and turbocharged piston engines, much of the centrifugal compressor technology from which was transferred to early gas turbines. Post WW II gas turbine development was predominantly focused upon the perfection of the multistage axial compressors, with the recognition that in certain applications the combined axial–cum–centrifugal compressor (AxC) could provide a more compact engine installation. Gas Turbines with AxC compressors now fulfill a significant sector of the aviation propulsion market, plus also some industrial applications. Individual research and development of both axial and centrifugal compressors types continues to higher plateaus of performance, and is the context of extensive publications, yet in difference a scarcity of written technology prevails for the AxC compressor. This conspicuous limited exposure of AxC compressor technology fostered the motivation for this treatise, the intent being to record whatever meager AxC information at large exists, plus highlighting turbomachinery design parameters which can assist in AxC continued performance perfection. Specifically a characteristic design feature of AxC examined is the influence of large impeller hub to tip diameter ratios Є.
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Elgabaili, Mohamed, Ahmed Tahir, Osama Algbaeili, Saleh Basher, and Fares Amir. "Optimization of Varibable Pitching for VAWT at Low Tip Speed Ratio." In ICEMIS'20: The 6th International Conference on Engineering & MIS 2020. ACM, 2020. http://dx.doi.org/10.1145/3410352.3410781.

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Roy, Bhaskar, A. M. Pradeep, A. Suzith, Dinesh Bhatia, and Aditya Mulmule. "Study of Tip Flows in High Hub-to-Tip Ratio Axial Compressors at Low Speed With Varying Tip Gaps, Inflow Conditions and Tip Shapes." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22092.

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The present study involves simulation of a single compressor rotor with a high hub-to-tip ratio blade. The study includes the effect of variation of tip gap, of tip shapes and of inlet axial velocity profiles, with inflows simulated similar to that of a typical rear stage environment of a multi-stage axial compressor. Numerical studies were carried out on a baseline rotor blade (without sweep or dihedral) and then on blades with sweep and dihedral applied at the tip region of the rotor. Simulation of these part-span sweep and dihedral shapes are done to study their effects on blade tip leakage flow. Results show that sweep and dihedral, in some cases, produce favorable tip flows, improving blade aerodynamics. Positive dihedral caused weakening of tip leakage vortex at design point as well as at peak pressure point. Negative dihedral may help postpone stall at the high pressure, low flow operation. Backward sweep weakened tip vortex at the design point. Contrary to some of the studies reported earlier forward sweep, when applied at the tip region, showed performance deterioration over the most of the operating range of the high hub-to-tip rotor.
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Murad, Nor Syaza Farhana Mohamad, Muhammad Nizam Kamarudin, Sahazati Md Rozali, and Mohd Hendra Hairi. "Achieving optimum tip-speed-ratio of a two-mass wind turbine system." In 2016 IEEE International Conference on Power and Energy (PECon). IEEE, 2016. http://dx.doi.org/10.1109/pecon.2016.7951660.

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Yokoyama, Hiroyuki, Fujio Tatsuta, and Shoji Nishikata. "Tip speed ratio control of wind turbine generating system connected in series." In 2011 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2011. http://dx.doi.org/10.1109/icems.2011.6073595.

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Johnston, Alex, and Martin Wosnik. "Analytical and Numerical Modeling of Performance Characteristics of Cross-Flow Axis Hydrokinetic Turbines." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-07021.

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A model for cross-flow axis hydrokinetic turbines based on blade element theory (BET) was developed. The model combines an extensive experimental and numerical high Reynolds number data set for symmetric airfoils with governing equations to predict performance characteristics of the turbines. The model allows for any number of turbine blades and for variable hydrofoil sweep angles; both straight blade (H-Darrieus) and helical blade (Gorlov) cross-flow axis turbines are modeled. In this model the free stream velocity and the turbine’s rate of rotation are not coupled hydrodynamically, and experimental calibration of the model for a specific turbine design is necessary. The calibrated model is then used with real inflow data from an actual tidal energy site to predict instantaneous power and energy yield over a period of time. Investigation of tip speed ratios allows for predictions of unsteady loadings, optimal performance and power outputs. The model provides the versatility to predict characteristics of many different shapes and sizes of cross-flow axis turbines. Through investigation of turbine stall characteristics predicted by the model, two, turbine-specific tip speed ratios of interest were determined: the critical and optimal tip speed ratios. The “critical tip speed ratio” is defined as the tip speed ratio above which there are no longer regions of negative torque during the turbine rotation. The “optimal tip speed ratio” is defined as the tip speed ratio for which the coefficient of torque, averaged over one rotation, is maximized. It is hypothesized that these tip speed ratios correspond to specific turbine operating points: A turbine operating under no load conditions will spin near the optimal tip speed ratio, and a turbine operating at peak power conditions will spin near the critical tip speed ratio.
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Moeller, Michael, and Kenneth Visser. "Experimental and Numerical Studies of a High Solidity, Low Tip Speed Ratio DAWT." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-1585.

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Liu, Xin, Qijie Zhao, and Jianxia Lu. "Simulation method of semi-physical wind power generation based on combined wind speed and tip speed ratio." In 2020 Chinese Automation Congress (CAC). IEEE, 2020. http://dx.doi.org/10.1109/cac51589.2020.9327046.

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El-Tamaly, Hassan H., and Ayman Yousef Nassef. "Tip speed ratio and Pitch angle control based on ANN for putting variable speed WTG on MPP." In 2016 Eighteenth International Middle East Power Systems Conference (MEPCON). IEEE, 2016. http://dx.doi.org/10.1109/mepcon.2016.7836957.

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Souleimani, Yassine, Huu Duc Vo, and Hong Yu. "Performance Desensitization for a High-Speed Axial Compressor." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77203.

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The increase in compressor tip clearance over the lifespan of an aero-engine leads to a long-term degradation in its fuel consumption and operating envelope. A highly promising recent numerical study on a theoretical high-speed axial compressor rotor proposed a novel casing treatment to decrease performance and stall margin sensitivity to tip clearance increase. This paper aims to apply and analyze, through CFD simulations, this casing treatment concept to a representative production axial compressor rotor with inherently lower sensitivity to tip clearance increase and complement the explanation on the mechanism behind the reduction in sensitivity. Simulations of the baseline rotor showed that the lower span region contribute as much to the pressure ratio sensitivity as the tip region which is dominated by tip leakage flow. In contrast, the efficiency sensitivity is mainly driven by losses occurring in the tip region. The novel casing treatment was successfully applied to the baseline rotor through a design refinement. Although the casing treatment causes some penalty in nominal performance, it completely reversed the pressure ratio sensitivity (i.e. pressure ratio increases with tip clearance) and reduced the efficiency sensitivity. The reversed pressure ratio sensitivity is explained by a rotation in the core flow in the lower span region indirectly induced by the flow injection from the casing treatment. The lower efficiency sensitivity comes from a reduction in the amount of fluid that crosses the tip clearance of two adjacent blades, known as double leakage. The casing treatment’s beneficial effect on stall margin sensitivity is less obvious because of the stall inception type of the baseline rotor and its change in the presence of the casing treatment.
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Reports on the topic "Tip speed ratio"

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Berney, Ernest, Jami Lynn Daugherty, and Lulu Edwards. Validation of the automatic dynamic cone penetrometer. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/44704.

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The U.S. military requires a rapid means of measuring subsurface soil strength for construction and repair of expeditionary pavement surfaces. Traditionally, a dynamic cone penetrometer (DCP) has served this purpose, providing strength with depth profiles in natural and prepared pavement surfaces. To improve upon this device, the Engineer Research and Development Center (ERDC) validated a new battery-powered automatic dynamic cone penetrometer (A-DCP) apparatus that automates the driving process by using a motor-driven hammering cap placed on top of a traditional DCP rod. The device improves upon a traditional DCP by applying three to four blows per second while digitally recording depth, blow count, and California Bearing Ratio (CBR). An integrated Global Positioning Sensor (GPS) and Bluetooth® connection allow for real-time data capture and stationing. Similarities were illustrated between the DCP and the A-DCP by generation of a new A-DCP calibration curve. This curve relates penetration rate to field CBR that nearly follows the DCP calibration with the exception of a slight offset. Field testing of the A-DCP showed less variability and more consistent strength measurement with depth at a speed five times greater than that of the DCP with minimal physical exertion by the operator.
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