Relevant bibliographies by topics / Solidity ratio

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

Academic literature on the topic 'Solidity ratio'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Solidity ratio"

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Zawadzki, Karol, Wojciech Śmiechowicz, Małgorzata Stępień, Anna Baszczyńska, and Michał Tarkowski. "Influence of the Solidity Ratio on the Small Wind Turbine Aerodynamics." E3S Web of Conferences 242 (2021): 03006. http://dx.doi.org/10.1051/e3sconf/202124203006.

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Increasing popularity of individualised electricity generation from wind by prosumers creates a strong demand for profitable and highly efficient small wind turbines. This paper investigates the influence of rotor blade solidity parameter on device efficiency in hope of determining its optimal value as a part of the development process of the GUST small wind turbine. The study involved experimental analysis in the wind tunnel and numerical simulations performed in QBlade software. Different solidities of the rotor were achieved by alteration of (1) number of blades and (2) chord distribution along the blade span. The increase of rotor solidity resulted in augmentation of the aerodynamic efficiency in both approaches. The elongation of the chord by 33% in a 3-bladed rotor resulted in a bigger power coefficient increment than addition of a 4th blade with original chord distribution. Even though the solidity was the same, the 3-bladed rotor performed better, possibly due to lower form drag. The results emphasize the importance of the rotor solidity optimization during the small wind turbine rotor development and may significantly influence overall power output.
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Nakagawa, Koji, Hiroshi Hayami, and Yuichi Keimi. "Comparison of Two Diffusers in a Transonic Centrifugal Compressor." International Journal of Rotating Machinery 9, no. 4 (2003): 279–84. http://dx.doi.org/10.1155/s1023621x03000253.

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Flow mechanisms suppressing the flow separation in two diffusers, a low-solidity cascade diffuser and a vaned diffuser with additional small vanes near the inlet, were compared mainly by numerical simulation. As the superiority of the low-solidity cascade diffuser was expected, a series of experiments was conducted using a transonic centrifugal compressor with a maximum pressure ratio of 7. The performance of the compressor with the vaned diffuser was comparable to that of the low-solidity cascade diffuser only between the surge point and the design flowrate at a pressure ratio of 3.5. The maximum flowrate of the vaned diffuser was lower than that of the low-solidity cascade diffuser. At higher rotational speeds, the pressure ratio at the surge point, the efficiency, and the flow range of the low-solidity cascade diffuser exceded those of a vaned diffuser at a pressure ratio of 3.5.
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Cui, Ying, and Zhen Liu. "Effects of Solidity Ratio on Performance of OWC Impulse Turbine." Advances in Mechanical Engineering 7, no. 1 (December 23, 2014): 121373. http://dx.doi.org/10.1155/2014/121373.

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Castellano, S., A. Candura, and G. Scarascia Mugnozza. "RELATIONSHIP BETWEEN SOLIDITY RATIO, COLOUR AND SHADING EFFECT OF AGRICULTURAL NETS." Acta Horticulturae, no. 801 (November 2008): 253–58. http://dx.doi.org/10.17660/actahortic.2008.801.24.

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Oliveira, Pedro, Marion Alliet, Carole Coufort-Saudejaud, and Christine Frances. "New insights in morphological analysis for managing activated sludge systems." Water Science and Technology 77, no. 10 (April 26, 2018): 2415–25. http://dx.doi.org/10.2166/wst.2018.189.

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Abstract In activated sludge (AS) process, the impact of the operational parameters on process efficiency is assumed to be correlated with the sludge properties. This study provides a better insight into these interactions by subjecting a laboratory-scale AS system to a sequence of operating condition modifications enabling typical situations of a wastewater treatment plant to be represented. Process performance was assessed and AS floc morphology (size, circularity, convexity, solidity and aspect ratio) was quantified by measuring 100,000 flocs per sample with an automated image analysis technique. Introducing 3D distributions, which combine morphological properties, allowed the identification of a filamentous bulking characterized by a floc population shift towards larger sizes and lower solidity and circularity values. Moreover, a washout phenomenon was characterized by smaller AS flocs and an increase in their solidity. Recycle ratio increase and COD:N ratio decrease both promoted a slight reduction of floc sizes and a constant evolution of circularity and convexity values. The analysis of the volume-based 3D distributions turned out to be a smart tool to combine size and shape data, allowing a deeper understanding of the dynamics of floc structure under process disturbances.
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McFarlane, Caroline M., and Alvin W. Nienow. "Studies of high solidity ratio hydrofoil impellers for aerated bioreactors. 1. Review." Biotechnology Progress 11, no. 6 (November 1995): 601–7. http://dx.doi.org/10.1021/bp00036a001.

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Chaudhary, Manoj Kumar, and Anindita Roy. "Design & optimization of a small wind turbine blade for operation at low wind speed." World Journal of Engineering 12, no. 1 (February 1, 2015): 83–94. http://dx.doi.org/10.1260/1708-5284.12.1.83.

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A small wind turbine blade was designed and optimized in this research paper. The blade plays an important role, because it is the most important part of the energy absorption system. Consequently, the blade has to be designed carefully to enable to absorb energy with its greatest efficiency. The main objective of this paper is to optimized blade number and selection of tip speed ratio corresponding to the solidity. The power performance of small horizontal axis wind turbines was simulated in detail using blade element momentum methods (BEM). In this paper for wind blade design various factors such as tip loss, hub loss, drag coefficient, and wake were considered. The design process includes the selection of the wind turbine type and the determination of the blade airfoil, twist angle distribution along the radius, and chord length distribution along the radius. A parametric study that will determine if the optimized values of blade twist angle and chord length create the most efficient blade geometry. The 3-bladed, 5-bladed and 7-bladed rotor achieved maximum values of Cp 0.46, 0.5 and 0.48 at the tip speed ratio 7, 5 and 4 respectively. It was observed that using BEM theory, maximum Cp varied with strongly solidity and weakly with the blade number. The studies showed that the power coefficient increases upto blade number B = 5, while the blade number if increased above 5 then the power coefficient decreases at operating pitch angle equal to 3°. Highest Cp would have solidity between 4% to 6% for number of blade 3 and design point tip speed ratio of about "7". Highest Cp would have solidity ranging from 5% to 10% for number of blade 5 and 7 and design point tip speed ratio of about 5 and 4 respectively.
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Ghiasi, Pedram, Gholamhassan Najafi, Barat Ghobadian, and Ali Jafari. "Analytical and Numerical Solution for H-type Darrieus Wind Turbine Performance at the Tip Speed Ratio of Below One." International Journal of Renewable Energy Development 10, no. 2 (December 30, 2020): 269–81. http://dx.doi.org/10.14710/ijred.2021.33169.

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H-type Darrieus vertical axis wind turbines (VAWT) have omnidirectional movement capability and can get more power compared to other VAWTs at high tip speed ratios (𝜆). However, its disadvantages are self-starting inability and low generated power at 𝜆 less than 1. The performance of H-type Darrieus wind turbine at 𝜆<1 was studied using double multiple stream tube (DMST) model and two-dimensional computational fluid dynamic (CFD) simulation. In CFD simulation, the Unsteady Reynolds Averaged Navier-Stokes (URANS) equations were used and the turbulence model was solved with SST k-ω model. The performance of fifteen various wind turbines was determined at fourteen wind velocities by two solution methods. The effect of chord length, solidity, Reynolds number and Height to Diameter (H/D) ratio were investigated on generated torque, power and the time required to reach 𝜆=0.1. Increasing in the moment of inertia due to the increasing in required time to reach 𝜆=0.1. In the low TSRs, the wind turbines can generate higher torque and power in high Re numbers and solidities. The required time was reduced by an increase in Re number and solidity. Finally, the best ratio of H/D of H-type Darrieus wind turbines was defined to improve the turbine performance.
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Rasekh, Sepehr, and Saeed Karimian. "Effect of solidity on aeroacoustic performance of a vertical axis wind turbine using improved delayed detached eddy simulation." International Journal of Aeroacoustics 20, no. 3-4 (March 25, 2021): 390–413. http://dx.doi.org/10.1177/1475472x211003299.

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Vertical axis wind turbines (VAWTs) can be suitably installed in urban regions. Although the power performance is essential, the noise generated by a VAWT may influence the living environment. An accurate prediction of power and noise performance is therefore necessary. In the present study, a precise aerodynamic and aeroacoustic performance assessment of a Darrieus VAWT is accomplished with the aim of exploring the effect of solidity parameter using a high-fidelity method. The improved delayed detached eddy simulation (IDDES) and the Ffowcs Williams and Hawkings (FW-H) acoustic analogy approaches have been utilized for predicting flow field and noise level. The simulations were performed in three different solidities at a specific tip speed ratio (TSR). It is shown that changing the solidity parameter affects both power and noise level remarkably. Change in the aerodynamic performance mostly occurs due to variation in instantaneous effective angle of attack which comprises many detailed discussions. The lower the solidity the higher the value of effective angle of attack. The noise level also affects by changing solidity as consequence of flow field variation. It is discussed here how the noise level would alter in terms of solidity, TSR, distance and azimuth angle. As the solidity increases, the sound pressure level (SPL) at blade pass frequency increases. Since design of quieter VAWT with application in urban regions recently is of the most interest and importance therefore such deep studies could appropriately address hybrid criteria and be helpful in future investigations.
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Duquette, Matthew M., Jessica Swanson, and Kenneth D. Visser. "Solidity and Blade Number Effects on a Fixed Pitch, 50 W Horizontal Axis Wind Turbine." Wind Engineering 27, no. 4 (August 2003): 299–316. http://dx.doi.org/10.1260/030952403322665271.

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Experimental studies were conducted on a modified Rutland 500 horizontal axis wind turbine to evaluate numerical implications of solidity and blade number on the aerodynamic performance. Wind tunnel data were acquired on the turbine with flat-plate, constant-chord blade sets and optimum-designed blade sets to compare with theoretical trends, which had indicated that increased solidity and blade number more than conventional 3-bladed designs, would yield larger power coefficients, CP. The data for the flat plate blades demonstrated power coefficient improvements as the range of solidities was increased from 7% to 27%, but did not indicate performance gains for increased blade numbers. It was also observed that larger pitch angles decreased the optimum tip speed ratio range significantly with a small (5% or less) change in maximum CP. The optimum-design 3-bladed rotors produced an increased experimental CP as solidity increased, with reduced tip speed ratio, at the optimum operating point. As blade number was increased at a constant solidity of 10% from 3 to 12 blades, aerodynamic efficiency and power sharply decreased, contrary to the numerical predictions and the flat plate experimental results. Low Reynolds numbers and wind tunnel blockage effects limit these conclusions and a full scale prototype rotor is being constructed to examine the results of the numerical and experimental studies using a side-by-side comparison with a commercially available wind turbine at the Clarkson University wind-turbine test site.
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Dissertations / Theses on the topic "Solidity ratio"

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Norman, Adam Edward. "A Fundamental Study of Advance Ratio, Solidity, Turbine Radius, and Blade Profile on the Performance Characteristics of Vertical Axis Turbines (VATs)." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81836.

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In this dissertation, various VAT parameters are investigated to determine the effect of the overall efficiency of the turbine at a high Reynolds number. To increase the efficiency of the vertical axis turbines, 2D CFD simulations are completed in an effort to better understand the physics behind the operation of these turbines. Specifically, the effect of advance ratio, solidity, and wake interactions were investigated. Simulations were completed in OpenFOAM using the k-ω SST turbulence model at a nominal Reynolds number of 500,000 using a NACA 0015 airfoil. To simulate the motion of the turbine, Arbitrary Mesh Interfacing (AMI) was used. For all of the parameters tested, it was found that the geometric effective angle of attack seen by the turbine blades had a significant impact on the power extracted from the flow. The range of effective angles of attack was found to decrease as the advance ratio increased. In spite of this, a severe loss in the power coefficient occurred at an advance ratio of 2.5 during which the blade experienced dynamic stall. This effect was also seen when the number of turbine blades was changed to four, at a solidity of 1.08. This negative impact on performance was found to be due to the increase in the drag component of the tangential force when dynamic stall occurs. Results indicate that wake interactions between subsequent blades have a large impact on performance especially when the wake interaction alters the flow direction sufficiently to create conditions for dynamic stall. To improve the performance of the VAT in the presence of dynamic stall, calculations were completed of a static twisted blade profile using GenIDLEST and OpenFOAM. There was found to be no improvement in the lift coefficient when comparing the twisted blade profile with a 2D blade at the same median angle of attack as the twisted blade. To further see the effects of the twisted blade, an effective VAT pitching motion was given to the blade and again compared to a 2D blade with the same motion. In this case there was significant improvement seen in the performance of the twisted blade.
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Östhem, Frida, and Emelie Fredell. "Kapitalcirkus : Vad påverkar svenska börsnoterade företags val av kapitalstruktur?" Thesis, Södertörn University College, School of Business Studies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-2813.

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Andrýsková, Stanislava. "Hodnocení finanční situace podniku a návrhy na její zlepšení." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2008. http://www.nusl.cz/ntk/nusl-377354.

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This thesis evaluates the financial situation of the company Vetropack Moravia Glass, joint-stock company in the time period of 2002 – 2006 by way of prime financial analysis methods. The thesis contains proposals of possible solutions and recommendations for an improvement of financial situation of the firm in future years.
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Balšínková, Jana. "Hodnocení finanční situace podniku a návrhy na její zlepšení." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222109.

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This master thesis analyses the financial situation of the company Olma, a.s. in years 2003-2007 using selected methods of financial analysis. The thesis contains proposals of possible solutions and recommendations for an improvement of financial situation of the firm in the next years as well as for the secure of its stability.
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Poli, Tiglat, and Aram Aciz. "Vad prissätter Stockholmsbörsen? : En studie om publika nyckeltals samband med P/E tal." Thesis, Södertörn University College, School of Business Studies, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-3088.

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Molnár, Peter. "Hodnocení finanční situace podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2009. http://www.nusl.cz/ntk/nusl-222213.

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This master’s thesis evaluates the financial situation of the company RIBE Slovakia Ltd. in the time period of 2002 to 2007 detected by selected methods of financial analysis. This thesis contains proposals of possible solutions for improvement of financial situation of company in the future.
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Fjellstedt, Hanna, and Daniel Fischer. "IFRS 9 Finansiella instrument : Vilken effekt den nya regleringen har på svenska banker efter införandet." Thesis, Högskolan Dalarna, Företagsekonomi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:du-30762.

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Bakgrund: En ny reglering har införts den 1 januari 2018, vilket är IFRS 9 finansiella instrument som ersätter IAS 39. Värdering och redovisning förändras från en objektiv till en subjektiv bedömning av kreditförluster. Syfte: Syftet med studien är att undersöka vilken effekt IFRS 9 har på svenska banker efter införandet. Studien undersöker även om effekten varierar beroende av bankers storlek. Metod: För att uppnå studiens syfte har en kvantitativ studie med deduktiv ansats tillämpats. Sekundärdata har inhämtats ur bankernas årsredovisningar för 2018 från respektive hemsida. Banker som ingår i studien är 43 svenska banker som står under Finansinspektionens tillsyn. Studiens tre hypoteser testades med hjälp av ttest, där parvis observation gjordes mellan åren 2017 och 2018. Resultat och slutsats: Resultatet visade en signifikant förändring av totala kapitalrelationen och kärnprimärkapitalrelationen i de större bankerna, vilka nyckeltalen var lägre efter införandet av IFRS 9. Egna kapitalet, kreditförlusterna och soliditeten kunde inte visa någon signifikant förändring. Slutsats av studiens resultat är att införandet av IFRS 9 haft en marginell effekt på svenska banker.
Background: The new regulation IFRS 9 has replaced IAS 39. The new regulation is subjective, forward-looking, compared with the old, objective model. Purpose: The purpose of our study was to investigate the effect IFRS 9 has on Swedish banks after the transition. Another aim is to study the effect of IFRS 9 on different bank sizes. Method: To achieve the purpose of the study, a quantitative method has been applied. Data has been obtained from annual reports for the year of 2018. The data consist of shareholders equity, balance sheet total and reported loan losses. Hypothesis testing has been done by using t-test Result and conclusion: The results can support a week significant positive effect on Tier 1 capital and capital adequacy ratio from large banks. No results could be found for Shareholders equity, Credit loss or Solidity.
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Ayers, James T. "Hydrodynamic Drag and Flow Visualization of IsoTruss Lattice Structures." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd782.pdf.

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Rak, Tomáš. "Zlepšení finanční situace podniku využitím factoringu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2007. http://www.nusl.cz/ntk/nusl-221560.

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This master's thesis is dealing with alternate form of financing – factoring and its benefits for the company. Theoretic part explains the basics of factoring, its types, advantages and disadvantages. Practical part displays the influence of factoring by help of financial analysis on specific company – how factoring helped to improve financial situation. Next the costs of factoring are compared with bank overdraft. At the end of thesis is defined recommendation to continue with factoring.
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Bayer, Tomáš. "Hodnocení finanční situace podniku a návrhy na její zlepšení." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223102.

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This diploma’s thesis discourses classification of the company financial status. There are used several methods of financial analysis to classify the status. Thesis is divided into three general parts. In the first part there are discussed theoretical starting-points needed for better understanding and elaborating of financial analysis. Second part contains financial analysis of chosen company during years 2005 to 2009. In the last part of the thesis there are said suggestions how to solve problematic areas in company financial status.
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Books on the topic "Solidity ratio"

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1950-, Matelski Marilyn J., ed. Messages from the underground: Transnational radio in resistance and in solidarity. Westport, Conn: Praeger, 1997.

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Richardson, John. A new vision for America: Toward human solidarity through global democracy : a memoir. New York: Ruder Finn Press, 2006.

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Bohlman, Andrea F. Musical Solidarities. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190938284.001.0001.

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This book studies the relationship between music making and social movements using the Solidarity movement in 1980s Poland as a case study. Its central argument is that while music offered a means of performing and commemorating the Solidarity movement as unified, the media of the opposition to state socialism also revealed—and continue to reveal—dissonant discourses on citizenship, culture, and history. The story unfolds along crucial sites of political action under state socialism: underground radio networks, the sanctuaries of the Polish Roman Catholic Church, labor strikes and student demonstrations, and commemorative performances. The musics and sounds of the 1980s are traced through a long history of musical nationalism in East Central Europe and across a transnational media network specific to the Cold War and life under state socialism. By revealing the diverse repertories—singer-songwriter verses, religious hymns, large-scale symphonies, experimental music, and popular song—that played a role across the decade, the book challenges paradigmatic visions of a late twentieth-century global protest culture that place song and communitas at the helm of social and political change. Musical Solidarities draws equally on the methods of historical musicology, ethnomusicology, and sound studies to propose a model for understanding popular, art, and sacred musics alongside one another and in the context of singing, shouting, and listening within the study of political action.
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Richardson, John. A New Vision for America: Toward Human Solidarity Through Global Democracy (An Adst-Dacor Diplomats and Diplomacy Book). Ruder Finn Press, Inc., 2006.

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Hepburn, Allan. A Grain of Faith. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198828570.001.0001.

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During and after the Second World War, religion informed British literature and culture. Leading writers contributed to discussions about faith and spiritual life, inside and outside organized religion. Graham Greene, Muriel Spark, and Barbara Pym incorporated miracles, evil, and church-going into their novels, while Louis MacNeice, T. S. Eliot, and C. S. Lewis gave radio broadcasts about the role of Christianity in contemporary society. Certainly the war revived interest in aspects of Christian life: salvation and redemption were on many people’s minds. The Ministry of Information used images of bombed churches to stoke patriotic feeling, and King George VI led a series of Days of National Prayer that coincided with crucial events in the Allied cause. After the war and throughout the 1950s, approximately 1.4 million people converted to Roman Catholicism as a way of expressing their spiritual ambitions and solidarity with humanity on a world-wide scale. Eminent intellectuals, such as Paul Tillich, Ronal Niebuhr, Jacques Maritain, and Simone Weil, gave concerted thought to religion and statehood, often at the same time. The mid-century turn to religion offered ways to articulate statehood, not from the usual perspective of nationhood and politics, but from the perspective of moral action and improvement of the lot of humankind. Religion provided one way for writers to answer the question, ‘what is man?’ It also afforded ways to think about social obligation. Instead of being a retreat into seclusion and solitude, the mid-century turn to religion is a call to responsibility.
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Book chapters on the topic "Solidity ratio"

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Fairchild, Charles. "Social Solidarity in the Luminiferous Ether." In Music, Radio and the Public Sphere, 17–40. London: Palgrave Macmillan UK, 2012. http://dx.doi.org/10.1057/9780230390515_2.

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Yap, Moi Hoon, Eran Edirisinghe, and Helmut Bez. "Computer Aided Detection and Recognition of Lesions in Ultrasound Breast Images." In Innovations in Data Methodologies and Computational Algorithms for Medical Applications, 125–52. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0282-3.ch009.

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The authors extend their previous work on Ultrasound (US) image lesion detection and segmentation, to classification, proposing a complete end-to-end solution for automatic Ultrasound Computer Aided Detection (US CAD). Carried out is a comprehensive analysis to determine the best classifier-feature set combination that works optimally in US imaging. In particular the use of nineteen features categorised into three groups (shape, texture and edge), ten classifiers and 22 feature selection approaches are used in the analysis. From the overall performance, the classifier RBFNetworks defined by the WEKA pattern recognition tool set, with a feature set comprising of the area to perimeter ratio, solidity, elongation, roundness, standard deviation, two Fourier related and a fractal related texture measures out-performed other combinations of feature-classifiers, with an achievement of predicted Az value of 0.948. Next analyzed is the use of a number of different metrics in performance analysis and provide an insight to future improvements and extension.
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Feu, Montse. "Solidarity for Political Prisoners." In Fighting Fascist Spain, 96–110. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043246.003.0006.

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The Confederadas and its supporters held hundreds of rallies, pickets, and demonstrations across the United States to protest political persecution in Spain. In their cultural fundraisers, antifascist plays were performed, artists danced and sang, speeches were delivered, dinners were served, dance orchestras played, lotteries were held, and funds subsequently collected. España Libre reviewed the extraordinary activism for political prisoners in each of its issues. Protest was extended to other media, too. Members published letters of protest in American mainstream papers and rented radio space in several radio stations. The Confederadas’ numerous forms of protest and occupation of the public space garnered international attention for the incarcerations and executions of dissenters in Spain.
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"One. Solidarity Forever? The Musicians’ Union Responds to Records and Radio." In Tell Tchaikovsky the News, 19–40. Duke University Press, 2020. http://dx.doi.org/10.1515/9780822378839-004.

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Trotter, David. "Conclusion." In The Literature of Connection, 235–46. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198850472.003.0010.

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This chapter offers a brief recapitulation of what has been learnt by approaching British and other literatures of the period 1850 to 1950 from the perspective of the ideas of signal and interface. It concludes that, while the pressure these ideas exerted did indeed remain constant throughout the period, it took an eccentric emphasis on aspects of form to reconfigure the text itself as a manipulation of signal-to-noise ratio. The ‘modernism’ which took shape in works by Lewis, Loy, and Mirrlees was a specialist affair. The chapter concludes with two further case studies. The first has to do with the function of a particular architectural feature—the corridor—in nineteenth-century British poetry and fiction; the second with the hugely influential theory and practice of the Russian film director Sergei Eisenstein, who thought that political solidarity was best expressed by means of what we would now term ‘social media’.
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Mendes, Kaitlynn, Jessica Ringrose, and Jessalynn Keller. "Hashtag Feminism." In Digital Feminist Activism, 125–44. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190697846.003.0006.

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This chapter focuses on women’s use of the Twitter hashtag #BeenRapedNeverReported. Using the hashtag, hundreds of girls and women shared the reasons they didn’t report incidents of sexual assault by partners, family members, friends, and acquaintances. We explore how this feminist hashtag developed in response to the public allegations of sexual violence made about then-popular Canadian CBC radio host Jian Ghomeshi, and ultimately moved across the media landscape, producing a robust public discussion about sexual violence and rape culture. Drawing on thematic analysis of #BeenRapedNeverReported tweets and interviews with eight women who contributed to the hashtag, we analyze the “affective solidarity” produced along this hashtag and the ways it created new lived possibilities for feminist identification, experience, organizing, and resistance. We contextualize this analysis within a larger Canadian media culture to position the hashtag as both a discursive and affective intervention into hegemonic public discourse about rape culture and sexual violence.
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Werth, Sabine. "The Tafel and food poverty in Germany." In Austerity, Community Action, and the Future of Citizenship. Policy Press, 2017. http://dx.doi.org/10.1332/policypress/9781447331032.003.0008.

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Founded in 1993 by four women in Berlin, Germany, the Berliner Tafel is Germany’s oldest food rescue organization. The Tafel concept was quickly replicated and eventually developed into a nationwide network. Today, the Berliner Tafel has approximately 1,800 volunteers who tirelessly work to collect surplus food and deliver it to those in need throughout the city. The organization supplies over 300 social initiatives ranging from homeless shelters to soup kitchens and operates 45 food distribution points, Laib und Seele, in partnership with churches and the regional radio and television network. The Berliner Tafel supports more than 125,000 people in need every month with quality food that would otherwise have been unnecessarily thrown away. After the organization’s primary mission of rescuing food had adequately matured, the decision was taken to branch out and impact the lives of the children and youth of Berlin by establishing the KIMBA programme, which aims to teach young people from all backgrounds the value of food, good nutrition and the importance of sharing a meal together. Through all these activities the Berliner Tafel bolsters the fabric of German society by supporting vulnerable citizens while simultaneously having a positive impact on the environment and encouraging solidarity within and among Berlin’s diverse communities.
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Conference papers on the topic "Solidity ratio"

1

Oh, JongSik, and Giri L. Agrawal. "Numerical Investigation of Low Solidity Vaned Diffuser Performance in a High-Pressure Centrifugal Compressor: Part I — Influence of Vane Solidity." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27260.

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The LSD (Low Solidity Diffuser) is becoming popular in most industrial centrifugal compressor designs because it is found to offer a wide operating flow range while maintaining a similar level of efficiency as in case of conventional vaned diffusers. Most related studies have been for low or moderate pressure ratio machines providing a limited range of design information for high-pressure ratio compressors. As a first step forward information of design parameters, a numerical CFD investigation was applied to a high-pressure industrial centrifugal compressor of design total-to-static pressure ratio of 4.0 with LSDs of NACA65-series profiles whose solidity varies from 0.452 to 0.968 in 5 cases with all the other design parameters fixed. Near design flow, the case of 0.839 solidity has the highest isentropic total-to-static efficiency. Other performance changes are accordingly investigated.
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Tsugawa, Takuji. "Case Study of Impeller Profile With Suitable Rotative Guidevane." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98045.

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In the previous paper, the optimum meridian profile of multi-stage impeller with guidevane was obtained by means of diffusion factor using twelve shape factors. The coefficient of peripheral absolute velocity at impeller inlet kCu1c means the effect of multi-stage impeller with guidevane. In this paper, the optimum meridian profile of multi-stage or single-stage impeller with rotative guidevane was obtained by means of fifteen shape factors. The fifteen shape factors mean impeller inlet relative flow angle β1, impeller turning angle Δβ, impeller axial velocity ratio kc12 = Cm2/Cm1, impeller diameter ratio kd12 = D1c/D2c, impeller outlet hub-tip ratio ν2, impeller tip solidity σt(imp), impeller mid span solidity σc(imp), impeller hub solidity σh(imp), guidevane tip solidity σt(gv), guidevane mid span solidity σc(gv), guidevane hub solidity σh(gv), guidevane axial velocity ratio kc34 = Cm4/Cm3, guidevane diameter ratio kd34 = D3c/D4c and rotational speed ratio Rn = ngv/nimp. The suitable rotational speed ratio means suitable rotational speed of guidevane. The axial velocity ratio and diameter ratio of guidevane means the optimum meridian profile of guidevane outlet. In the 15th dimensional optimum method, the hydraulic efficiency and suction specific speed are calculated by diffusion factor. This method is also used for the modification of multi-stage or single-stage present impellers and guidevanes.
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3

Sorokes, J. M., and J. P. Welch. "Experimental Results on a Rotatable Low Solidity Vaned Diffuser." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-019.

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This paper reviews test results from a rotatable low solidity vaned diffuser (RLSD). The device was installed in a single stage test vehicle consisting of a pseudo-return channel inlet, a subsonic centrifugal impeller (approx. 2:1 pressure ratio), the rotatable diffuser, a return channel and a dump collector. Static taps, total pressure probes, and thermocouples were located in critical areas throughout the stage. Manual traverse probes measured the pressure and angle profiles at RLSD leading and trailing edges. Results for various stagger angles, leading edge radius ratios, etc. are presented in terms of pressure recovery (Cp) and loss coefficient (LC). Comments are made regarding the applicability of the RLSD in production units.
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4

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. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-1585.

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5

Norman, Adam E., and Danesh K. Tafti. "The Effect of Advance Ratio, Solidity, and Wake Interactions on a 2D Vertical Axis Turbine." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7801.

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In recent years there has been an increased effort to utilize hydrokinetic devices to harvest energy from both wind and tidal flows. Vertical axis turbines utilization is of particular interest in tidal flows. A major disadvantage in vertical axis turbines is that they are less efficient than horizontal axis turbines. To increase the efficiency of the vertical axis turbines, 2D CFD simulations are completed in an effort to better understand the physics behind the operation of these turbines. Specifically, the effect of advance ratio, solidity, and wake interactions were investigated. Simulations were completed in OpenFOAM using the k-ω SST turbulence model at a nominal Reynolds number of 500,000 using a NACA 0015 airfoil. To simulate the motion of the turbine, Arbitrary Mesh Interfacing (AMI) was used. For all of the parameters tested, it was found that the geometric effective angle of attack seen by the turbine blades had a significant impact on the power extracted from the flow. The range of effective angles of attack was found to decrease as the advance ratio increased. In spite of this, a severe loss in the power coefficient occurred at an advance ratio of 2.5 during which the blade experienced dynamic stall. This effect was also seen when the number of turbine blades was changed to four, at a solidity of 1.08. Results indicate that wake interactions between subsequent blades have a large impact on performance especially when the wake interaction alters the flow direction sufficiently to create conditions for dynamic stall.
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Birjandi, Amir Hossein, and Eric Bibeau. "Reynolds Number Effects on the Freewheeling Behavior of a High Solidity Vertical River Kinetic Turbine." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39487.

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A four-bladed, squirrel-cage, and scaled vertical kinetic turbine was designed, instrumented and tested in the water tunnel facilities at the University of Manitoba. With a solidity of 1.3 and NACA0021 blade profile, the turbine is classified as a high solidity model. Results were obtained for conditions during freewheeling at various Reynolds numbers. In this study, the freewheeling tip speed ratio, which relates the ratio of maximum blade speed to the free stream velocity at no load, was divided into three regions based on the Reynolds number. At low Reynolds numbers, the tip speed ratio was lower than unity and blades were in a stall condition. At the end of the first region, there was a sharp increase of the tip speed ratio so the second region has a tip speed ratio significantly higher than unity. In this region, the tip speed ratio increases almost linearly with Reynolds number. At high Reynolds numbers, the tip speed ratio is almost independent of Reynolds number in the third region. It should be noted that the transition between these three regions is a function of the blade profile and solidity. However, the three-region behavior is applicable to turbines with different profiles and solidities.
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7

Song, Bo, Wing F. Ng, Joseph A. Cotroneo, Douglas C. Hofer, and Gunnar Siden. "Aerodynamic Design and Testing of Three Low Solidity Steam Turbine Nozzle Cascades." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53329.

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Three sets of low solidity steam turbine nozzle cascades were designed and tested. The objective was to reduce cost through a reduction in parts count while maintaining or improving performance. The primary application is for steam turbine high pressure sections where Mach numbers are subsonic and high levels of unguided turning can be tolerated. The baseline Design A has a ratio of pitch to axial chord of 1.2. This is the pitch diameter section of a 50% reaction stage that has been verified by multistage testing on steam to have a high level of efficiency. Designs B and C have ratios of pitch to axial chord of 1.5 and 1.8 respectively. All three designs satisfy the same inlet and exit vector diagrams. Analytical surface Mach number distributions and boundary layer transition predictions are presented. Extensive cascade test measurements were carried out for a broad incidence range from −60 to +35 degrees. At each incidence, four outlet Mach numbers were tested, ranging from 0.2 to 0.8, with the corresponding Reynolds number variation from 1.8×105 to 9.0×105. Experimental results of loss coefficient and blade surface Mach number are presented and compared for the three cascades. The experimental results have demonstrated low losses over the tested Mach number range for a wide range of incidence from −45 to 15 degrees. Designs B and C have lower profile losses than Design A. The associated flow physics is interpreted using the results of wake profile, blade surface Mach number distribution and blade surface oil flow visualization, with the emphasis placed on the loss mechanisms for different flow conditions and the loss reduction mechanism with lower solidity. The effect of the higher profile loading of the lower solidity designs on increased end wall losses induced by increased secondary flow, especially on low aspect ratio designs, is the subject of ongoing studies.
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8

Hayami, H., Y. Senoo, and K. Utsunomiya. "Application of Low-Solidity Cascade Diffuser to Transonic Centrifugal Compressor." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-66.

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Low-solidity circular cascades, conformally transformed from high-stagger linear cascades of double-circular-arc vanes with solidity 0.69, were used as a part of the diffuser system of a transonic centrifugal compressor. Performance test results were compared with data of the same compressor with a vaneless diffuser. Good compressor performance, a wider flow range as well as a higher pressure ratio and a higher efficiency, superior to those with a vaneless diffuser, where the flow range was limited by choke of the impeller, were demonstrated. The test circular cascade diffusers demonstrated a good pressure recovery over a wide range of flow angles, even when the inflow Mach number to the cascade was over unity.
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9

Sans, J., M. Resmini, J. F. Brouckaert, and S. Hiernaux. "Numerical Investigation of the Solidity Effect on Linear Compressor Cascades." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25532.

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Solidity in compressors is defined as the ratio of the aerodynamic chord over the peripheral distance between two adjacent blades, the pitch. This parameter is simply the inverse of the pitch-to-chord ratio generally used in turbines. Solidity must be selected at the earliest design phase, i.e. at the level of the meridional design and represents a crucial step in the whole design process. Most of the existing studies on this topic rely on low-speed compressor cascade correlations from Carter or Lieblein. The aim of this work is to update those correlations for state-of-the-art controlled diffusion blades, and extend their application to high Mach number flow regimes more typical of modern compressors. Another objective is also to improve the physical understanding of the solidity effect on compressor performance and stability. A numerical investigation has been performed using the commercial software FINE/Turbo. Two different blade profiles were selected and investigated in the compressible flow regime as an extension to the low-speed data on which the correlations are based. The first cascade uses a standard double circular arc profile, extensively referenced in the literature, while the second configuration uses a state-of-the-art CDB, representative of low pressure compressor stator mid-span profile. Both profiles have been designed with the same inlet and outlet metal angles and the same maximum thickness but the camber and thickness distributions, the stagger angle and the leading edge geometry of the CDB have been optimized. The determination of minimum loss, optimum incidence and deviation is addressed and compared with existing correlations for both configurations and various Mach numbers that have been selected in order to match typical booster stall and choke operating conditions. The emphasis is set on the minimum loss performance at mid-span. The impact of the solidity on the operating range and the stability of the cascade are also studied.
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10

Tsugawa, Takuji. "Case Study of Multi-Stage Impeller with Guidevane." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77294.

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In the previous paper, the optimum meridian profile of impeller was obtained for various specific speed by means of eight shape factors, that is, inlet relative flow angle β1, turning angle Δβ, axial velocity ratio kc = Cm2/Cm1, impeller diameter ratio kd = D1c/D2c, outlet hub-tip ratio ν2, tip solidity σtimp, mid span solidity σcimp and hub solidity σhimp. In this paper, the optimum meridian profile of multi-stage impeller with guidevane was obtained by means of twelve shape factors. The additional four shape factors are guidevane tip solidity σtgv, mid span solidity σcgv, hub solidity σhgv and coefficient of peripheral velocity at impeller inlet or guidevane outlet kCu1c. In the optimum method, the hydraulic efficiency and suction specific speed are calculated by diffusion factor. In the optimum condition, the best hydraulic efficiency or the best suction specific speed is obtained. In the cyclic flow condition of multi-stage impeller with guidevane, the absolute flow velocity of guidevane outlet is equal to that of impeller inlet, and the diameter of guidevane outlet is equal to that of impeller inlet. In this calculation, the diameter of impeller outlet is equal to that of guidevane inlet. The total calculation number of case study is very large, so the number of each parameter is about between four and seven. The best 1000 optimum meridian profiles and the best design parameter are selected for few kinds of specific speed using twelve dimensional optimum method. As the result of this calculation, the optimum meridian profile of multi-stage impeller and guidevane. The more detailed optimum multi-stage mixed flow impeller and guidevane profile is drawn. For, example, the 1000 specific speed is selected for case study of multi-stage mixed flow impeller. At first, the approximate optimum shape factors are present shape factors. And the optimum shape factors which have better efficiency are tried to find near the present shape factors. Then the study of shape factor changes is the objective of this paper.
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