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Gotowe bibliografie tematyczne / Tracking and trailing – Fiction

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Gotowa bibliografia na temat „Tracking and trailing – Fiction”

Autor: Grafiati

Data publikacji: 29 lipca 2024

Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Tracking and trailing – Fiction"

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Perry, Leah. "Trailing Clouds: Immigrant Fiction in Contemporary America". Journal of Popular Culture 40, nr 1 (luty 2007): 183–85. http://dx.doi.org/10.1111/j.1540-5931.2007.00367.x.

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Lee, A. Robert. "Trailing Clouds: Immigrant Fiction in Contemporary America by David Cowart". Modern Language Review 103, nr 1 (2008): 216–17. http://dx.doi.org/10.1353/mlr.2008.0146.

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Lee, Sang-Joon, Bu-Geun Paik i Choung Mook Lee. "Phase-Averaged Particle Tracking Velocimetry Measurements of Propeller Wake". Journal of Ship Research 49, nr 01 (1.03.2005): 43–54. http://dx.doi.org/10.5957/jsr.2005.49.1.43.

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The objective of the present paper is to apply an adaptive hybrid two-frame particle tracking velocimetry (PTV) technique for measuring the flow characteristics of turbulent wake behind a marine propeller with five blades. Compared to the conventional particle image velocimetry method, the hybrid PTV technique increases the spatial resolution and measurement accuracy significantly while reducing the computation time. For each of four different blade phases of 0, 18, 36, and 54 deg, 400 instantaneous velocity fields were measured. They were ensemble averaged to investigate the spatial evolution of the propeller wake in the region ranging from the trailing edge to a two propeller diameter (D) downstream location. The phase-averaged mean velocity fields show that the trailing vorticity and the viscous wake are formed by the boundary layers developed on the blade surfaces. The vorticity contours at each phase angle show that the tip vortices are produced periodically. The slipstream contraction occurs in the near-wake region up to about x= 0.5 D downstream. Thereafter the unstable oscillation occurs due to the separation of tip vortex from the wake sheet behind the maximum contraction point. As the tip vortex evolves downstream, its strength is reduced due to turbulent diffusion, viscous dissipation, and active mixing between tip vortices and adjacent wake flow. The technique presented here can be readily extended to investigate the nominal and effective wake distribution as well as the details of the flow field fore and aft of a rotating propeller behind a ship model.

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King, F. A., J. B. Maurice, W. Fichter, O. Dieterich i P. Konstanzer. "In-Flight Rotorblade Tracking Control for Helicopters Using Active Trailing-Edge Flaps". Journal of Guidance, Control, and Dynamics 37, nr 2 (marzec 2014): 633–43. http://dx.doi.org/10.2514/1.59475.

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Fast, M. "SP-0858 Tracking, trailing and gating: How fast should "real-time" adaptation be?" Radiotherapy and Oncology 170 (maj 2022): S757—S758. http://dx.doi.org/10.1016/s0167-8140(22)04050-6.

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Kim, Wi-Jiwoon, Seo Rin Yoon, Seohyun Nam, Yunjin Lee i Dongsun Yim. "The Impact of Reading Modalities and Text Types on Reading in School-Age Children: An Eye-Tracking Study". Applied Sciences 13, nr 19 (28.09.2023): 10802. http://dx.doi.org/10.3390/app131910802.

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This study examined the eye movement patterns of 317 elementary students across reading conditions (audio-assisted reading (AR) and reading-only (R)) and text types (fiction and non-fiction) and identified eye movement parameters that predict their literal comprehension (LC) and inferential comprehension (IC). Participants, randomly assigned to either reading condition and either text type, answered questions assessing their LC and IC. Average fixation duration (AFD), total fixation duration (TFD), and scanpath length were used as eye movement parameters. The main effects of age were observed on all parameters, along with interaction effects between age and reading condition on TFD and scanpath length. These results indicate that children employ different reading strategies, depending on reading modalities and text types. When controlling for age, TFD had a positive impact on the LC of both text types in the AR, while in the R, it had a negative effect on the IC of both text types. Longer scanpaths predicted the IC of fiction in the AR; the LC and IC of non-fiction under the AR; and the LC of non-fiction within the R. AFD had a negative influence on the IC of fiction in the AR, as well as on the LC and IC of non-fiction in the AR, and the LC of non-fiction under the R. These findings highlight the importance of selecting appropriate reading strategies, based on reading modality and text type, to enhance reading comprehension. This study offers guidance for educators when providing reading instruction to school-age children.

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Yu, Jiyang, Dan Huang, Wenjie Li, Xianjie Wang i Xiaolong Shi. "Dim Staring Debris Targets Detection Method with Dense Long Trailing Star". Applied Sciences 13, nr 16 (11.08.2023): 9148. http://dx.doi.org/10.3390/app13169148.

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With the gradual increase in spacecraft in orbit, space debris monitoring has become the key to the sustainable development of space missions. A staring debris detection method is proposed for high-density stars with long tails. In order to solve the problem that the gray level of a long trailing image is not stable and continuous, rectangular fitting is used to complete the aggregation of the trailing image and reduce the influence of noise on the trailing information. The occluded state of the target was analyzed, the feature calculation method was improved, the semi-occluded scene was statistically classified, the fully connected network (FCN) based finite point feature was accurately classified, and the semi-occluded image was extracted. Based on the extracted semi-occluded image, the inter-frame association can improve the success probability of target association and realize the effective detection and tracking of debris. The detection accuracy was tested for the changing inter-frame interval and signal-to-noise ratio (SNR), and the relationship between the index parameters and key parameters was given. Compared with previous literature, this design can detect and track the occluded target with a detection rate of more than 90% and a false alarm rate of less than 10%.

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Zhou, Jin, Xiasheng Sun, Qixing Sun, Jingfeng Xue, Kunling Song, Yao Li i Lijun Dong. "Design and Validation of the Trailing Edge of a Variable Camber Wing Based on a Two-Dimensional Airfoil". Biomimetics 9, nr 6 (23.05.2024): 312. http://dx.doi.org/10.3390/biomimetics9060312.

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Variable camber wing technology stands out as the most promising morphing technology currently available in green aviation. Despite the ongoing advancements in smart materials and compliant structures, they still fall short in terms of driving force, power, and speed, rendering mechanical structures based on kinematics the preferred choice for large long-range civilian aircraft. In line with this principle, this paper introduces a linkage-based variable camber trailing edge design approach. Covering coordinated design, internal skeleton design, flexible skin design, and drive structure design, the method leverages a two-dimensional supercritical airfoil to craft a seamless, continuous two-dimensional wing full-size variable camber trailing edge structure, boasting a 2.7 m span and 4.3 m chord. Given the significant changes in aerodynamic load direction, ground tests under cruise load utilize a tracking-loading system based on tape and lever. Results indicate that the designed single-degree-of-freedom Watt I mechanism and Stephenson III drive mechanism adeptly accommodate the slender trailing edge of the supercritical airfoil. Under a maximum cruise vertical aerodynamic load of 17,072 N, the structure meets strength requirements when deflected to 5°. The research in this paper can provide some insights into the engineering design of variable camber wings.

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Takeuchi. "Tracking Twain: The Unfulfilled Pursuit in Mark Twain's Detective Fiction". American Literary Realism 48, nr 2 (2016): 166. http://dx.doi.org/10.5406/amerlitereal.48.2.0166.

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Horner, M. B., E. Saliveros i R. A. McD Galbraith. "An examination of vortex convection effects during blade-vortex interaction". Aeronautical Journal 96, nr 960 (grudzień 1992): 373–79. http://dx.doi.org/10.1017/s0001924000025069.

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AbstractThe experimental results of a parallel Blade-Vortex Interaction (BVI) study are presented. The quality of all pressure data reflects improvements in the Glasgow University BVI facility and in the method of reducing and presenting data. Pressure histories clearly track the passage of a vortex-associated disturbance across the aerofoil. Tracking this disturbance permits an examination of vortex convection velocities, and also allows for a correlation between vortex trailing edge passage and force and moment perturbations.

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Rozprawy doktorskie na temat "Tracking and trailing – Fiction"

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Chen, Cai Dong Pinliang. "Developing a wildlife tracking extension for ArcGIS". [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/permalink/meta-dc-10999.

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Chen, Cai. "Developing a Wildlife Tracking Extension for ArcGIS". Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc10999/.

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Wildlife tracking is an essential task to gain better understanding of the migration pattern and use of space of the wildlife. Advances in computer technology and global positioning systems (GPS) have lowered costs, reduced processing time, and improved accuracy for tracking wild animals. In this thesis, a wildlife tracking extension is developed for ArcGIS 9.x, which allows biologists and ecologists to effectively track, visualize and analyze the movement patterns of wild animals. The extension has four major components: (1) data import; (2) tracking; (3) spatial and temporal analysis; and (4) data export. Compared with existing software tools for wildlife tracking, the major features of the extension include: (1) wildlife tracking capabilities using a dynamic data layer supported by a file geodatabase with 1 TB storage limit; (2) spatial clustering of wildlife locations; (3) lacunarity analysis of one-dimensional individual animal trajectories and two-dimensional animal locations for better understanding of animal movement patterns; and (4) herds evolvement modeling and graphic representation. The application of the extension is demonstrated using simulated data, test data collected by a GPS collar, and a real dataset collected by ARGOS satellite telemetry for albatrosses in the Pacific Ocean.

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Logie, Christopher. "The literacy of tracking : a comparative analysis of tracking within two Bushman post-hunter communities". Thesis, 2010. http://hdl.handle.net/10413/5058.

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Vast advances in technology have presented a platform for mediated forms to reach places where it was never before thought possible. Once remote communities can now be more easily accessed and in turn have easier access to modern ways of life. In light of this, Bushmen communities have been forced, due to a number of factors, to transform or adapt many their everyday cultural practices - one of which is tracking. Two Bushman post-hunter communities, the ≠Khomani from Witdraai in the Northern Cape of South Africa and the !Xoo who reside in Ngwatle in Southern Botswana, are the focus of a comparative analysis which assesses how the two communities use tracking, how they represent tracking and how they construct their identity through these representations. Louis Liebenberg’s extensive literature on the subject of tracking compounded with his groundbreaking research on CyberTracking provides an invaluable resource. It offers a contrasting scientific vantage point in comparison to J. Edward Chamberlin’s (2004) holistic anthropological approach to aboriginal cultures. Work central to demystifying the data includes debates within globalisation theory (Anthony Giddens 1990; David Held and Anthony McGrew 2000; Terhi Rantanen 2005), the homogenisation and heterogenisation of culture and Stuart Hall’s theory of essentialist and non-essentialist identity (1996). The data was obtained through research field trips to the areas in 2005 and 2007 respectively, and informs part of a larger project, Rethinking Indigeneity, headed by Professor Keyan G. Tomaselli. The subject communities contrast one another not only in how they represent themselves, but also how and why they practice tracking. The !Xoo, in comparison to the ≠Khomani, are less exposed to global media and as a result are considerably less aware of expectations attached to their ethnicity. This correlation provides an interesting link between cultural practices, remote communities and global media infiltration. It becomes apparent that culture is in a constant state of flux which is further emphasised through idiosyncratic cultural practices; in this case tracking.
Thesis (M.A.)-University of KwaZulu-Natal, Durban, 2010.

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"Evaluation of spoor tracking to monitor cheetah abundance in central northern Namibia". 2007. http://hdl.handle.net/10413/3382.

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The design, implementation, management and the evaluation of sound conservation practices, is often dependent on the availability of reliable estimates of animal abundance. Large carnivores often pose particular problems in this regard, due to their low densities and wide-ranging behaviour, so the true abundance of such species are seldom able to be reported in literature . As a result, the use of indices of abundance, mostly for relative abundance, has been investigated. However, before these indices can be reliably utilized for conservation purposes , there is a pressing need to calibrate them. As of yet, calibration studies have primarily been performed on demarcated conservation areas, where individuals could be individually identified. Not all these calibrations studies reported indices to be a function of true density. Nevertheless , spoor frequency has been reported to be a function of true density for carnivores in certain Parks in Namibia . Precisely , cheetah spoor density was reported to correlate with visuals in the Kgalagadi Transfrontier Park. The majority of these studies elucidate a species spatial organization, animal behaviour, as the paramount factor determining the relationship between densities estimated via different censusing methods. Thus, the efficiency of spoor frequency to estimate and monitor relative abundance for wild cheetahs is yet to be empirically tested . Despite the lack of a true density estimate for the free-ranging cheetahs in the study area, evaluated spoor tracking as a possible index to monitor relative cheetah abundance using radiotelemetry densities estimates as representative of true abundance for the area, for the 1995 to 2000 period. The study is considered to be opportunistic , and a pillar for future research, as transects where spoor tracking was conducted were layout primarily for ungulates strip counts. Least-linear regression and Spearman's correlation were used to evaluate the relationship between density estimates derived by the two methods. Percentages of change on annual densities were also regressed as a mean to test spoor frequency sensitivity to density changes. The calibration of spoor frequency with estimates of density produced using radio-telemetry, without the ascription of imprints to individual animals, was poor (rs=17.4, y=0.36+0.20). The sensitivity analysis also showed spoor tracking poor reliability to monitor cheetah population. This can be attributed, in order of importance, to the discrepancies on the spatial extent sampled by the two methods, the species large home ranges, substrate quality , habitat preferences, the availability of farm road networks and the transect design, i.e., cyclic. However, the paramount factor limiting the study conclusions was the lack of a more local density estimate at a farm level. Therefore, the use of spoor frequency to estimate wild cheetah relative abundance requires further research, particularly using a different sampling design, longer straight transects and the acquisition of local densities estimates.
Thesis (M.Sc.)-University of KwaZulu-Natal, Pietermaritzburg, 2007.

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Książki na temat "Tracking and trailing – Fiction"

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Mark, Henry. Hard road to heaven. Thorndike, Me: Center Point Pub., 2005.

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Hanratty, Tom. The art and science of tracking man and beast: With moral observations and philosophical musings for the betterment of the reader. Milwaukee, WI: Medicine Hawk Publications, 1997.

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Scott, Johnson. Hide & seek. Hubbardston, Mass: Deer Pond Pub., 1997.

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Judd, Cameron. The long hunt. New York: Signet, 2011.

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Copyright Paperback Collection (Library of Congress), red. Spiral hunt: An Evie Scelan novel. New York: EOS, 2009.

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Fulmer, Evalyn. Fatal mistake. New York: Avalon Books, 2010.

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Gates, S. P. Killer spiders. Tulsa, OK: EDC Publishing, 2013.

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Vincent, Rachel. Blood bound. Don Mills, Ontario, Canada: Mira Book, 2011.

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Medawar, Mardi Oakley. Murder on the Red Cliff Rez. Toronto: Worldwide, 2004.

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Medawar, Mardi Oakley. Murder on the Red Cliff Rez. Toronto: Worldwide, 2004.

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Części książek na temat "Tracking and trailing – Fiction"

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Døving, Kjell B. "Scent Trailing by Tracking Dogs. What is the Physiological Basis for Concentration Coding ?" W Chemosensory Information Processing, 271–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75127-1_18.

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Ingleby, Matthew. "Women in the Walkplace: Tracking Bloomsbury’s Female Pedestrians". W Nineteenth-Century Fiction and the Production of Bloomsbury, 165–202. London: Palgrave Macmillan UK, 2018. http://dx.doi.org/10.1057/978-1-137-54600-5_5.

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Pöntinen, Janna, i Pertti Vakkari. "Selecting Fiction in Library Catalogs: A Gaze Tracking Study". W Research and Advanced Technology for Digital Libraries, 72–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40501-3_8.

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Thornbury, Barbara E. "Gender and Mobility: Tracking Fictional Characters on Real Monorails, Trains, Subways, and Trams". W Mapping Tokyo in Fiction and Film, 69–91. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-34276-0_3.

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Rudanko, Juhani. "Tracking a Change over Five Decades: to Infinitive and to -ing Complements of Accustomed in American Fiction from the 1910s to the 1950s". W Linking Form and Meaning, 11–26. London: Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137509499_2.

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Stensaker, Inger G. "Methods for Tracking and Trailing Change". W Research in Organizational Change and Development, 149–74. Emerald Group Publishing Limited, 2013. http://dx.doi.org/10.1108/s0897-3016(2013)0000021008.

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"Scientific Analysis of Tracking, Trailing, and Scent Identification". W Police and Military Dogs, 75–94. Routledge, 2011. http://dx.doi.org/10.1201/b11265-10.

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"Tracking and Trailing in Criminal Investigations and Prosecutions". W Police and Military Dogs, 95–114. Routledge, 2011. http://dx.doi.org/10.1201/b11265-11.

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"History and Judicial Acceptance of Tracking and Trailing Evidence". W Police and Military Dogs, 53–74. Routledge, 2011. http://dx.doi.org/10.1201/b11265-9.

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Rigal-Aragón, Margarita. "Tracking Daniel's Steps". W Teaching Language and Literature On and Off-Canon, 262–95. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-3379-6.ch015.

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This chapter shows the results of a teaching-learning experience carried out for over 15 academic years. Since it is usually agreed that Edgar Allan Poe is the father of detective fiction, students are embarked in a deductive process to explore some key antecedents to “The Murders of the Rue Morgue.” This starts with the analysis of a few lines of Daniel's Book, Aesop's “The Fox and the Old Lion,” and some sections of Oedipus Rex. Afterwards the students enter the modern world, examining Hamlet, learning about Voltarie's Zadig, Vidocq, and The Newgate Calendar. Thenceforth, the impact of “Murders” among the 1840s public, together with its two sequels (“The Mystery of Marie Rogêt” and “The Purloined Letter”) is investigated, completing the Dupin Trilogy and assisting to the birth of “serialized” ratiocination narratives. Finally, students study “Thou Art the Man,” a non-Dupin detective story in which country manners are called into question.

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Streszczenia konferencji na temat "Tracking and trailing – Fiction"

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Yadlin, Yoram, Arvin Shmilovich i Robert Narducci. "A Method and Applications for Tracking Airplane Trailing Wakes". W 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/10.2514/6.2010-324.

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King, Frank, Jean-Baptiste Maurice, Walter Fichter, Oliver Dieterich i Peter Konstanzer. "In-Flight Tracking Control for Helicopters using Active Trailing Edge Flaps". W AIAA Guidance, Navigation, and Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-4443.

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Neis, Rose, Karin De Langis, Zae Myung Kim i Dongyeop Kang. "An Analysis of Reader Engagement in Literary Fiction through Eye Tracking and Linguistic Features". W Proceedings of the The 5th Workshop on Narrative Understanding. Stroudsburg, PA, USA: Association for Computational Linguistics, 2023. http://dx.doi.org/10.18653/v1/2023.wnu-1.13.

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Huang, Yangzi, i Melissa A. Green. "Comparing leading and trailing edge vortex circulation history with vortex identification and tracking methods". W 54th AIAA Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2082.

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Kiesner, Matthias, i Rudibert King. "Closed-Loop Active Flow Control of the Wake of a Compressor Blade by Trailing-Edge Blowing". W ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42026.

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This paper presents a closed-loop active flow control strategy to reduce the velocity deficit of the wake of a compressor stator blade. The unsteady stator-rotor interaction, caused by the incoming stator wakes, generates fast changes of the rotor blade loading, affecting the stability and the performance of the overall compressor. Negative effects will be seen likewise when unsteady combustion concepts, such as a pulsed detonation, produce upstream disturbances. Furthermore, the periodic unsteady flow leads to additional undesired effects such as noise and blade vibrations. A controlled reliable manipulation of the stator wake is a way to handle these issues. Therefore, investigations on wake manipulation with trailing-edge blowing were carried out on a new low-speed cascade test rig. Detailed information about the wake profile is obtained by five-hole probe measurements in a plane downstream of the cascade for the natural and the actuated flow at a Reynolds number of 6×105. These measurements show a significant reduction of the wake velocity deficit for the investigated actuator geometry with an injection mass flow of less than 1% of the passage mass flow. Based on these results a position in the wake was chosen which is representative for the actuation impact on the velocity deficit. There, a hot-wire-probe measurement serves as the controlled variable. A family of linear dynamic black-box models was identified from experimental data to account for nonlinear and unmodelled effects. Static nonlinearitiy was compensated for by a Hammerstein model to reduce the model uncertainty and get a higher controller performance. To handle off-design conditions, a robust controller working in a range of Reynolds numbers from 5×105 to 7×105 was synthesized. The task of the controller is to rapidly regulate the controlled variable to a reference velocity by changing the blowing amplitude. The synthesized robust controller was successfully tested in closed-loop experiments with good results in reference tracking for pulse series up to 20 Hz. This translates into a much higher frequency when scaled to the dimension of a real machine.

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Zhang, Guoxian, Devendra P. Garg i Greg Fricke. "Hazardous Spill Perimeter Detection and Monitoring via Multiple Autonomous Mobile Robotic Agents". W ASME 2010 Dynamic Systems and Control Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/dscc2010-4160.

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The problem of perimeter detection and monitoring has a variety of applications. In this paper, a hybrid system with finite states strategy is proposed for multiple autonomous robotic agents with the purpose of hazardous spill perimeter detection and tracking. In the system, each robotic agent is assumed to be in one of the following states: searching, pursuing, and tracking. The agents are prioritized based on their states, and a potential field is constructed for agents in each state. The location and velocity of an agent in the tracking state as well as those of its closest leading and trailing agents are utilized to control its movement. The convergence of the tracking algorithm is analyzed for multiple spills under certain conditions. Simulation results show that with the proposed method, the agents can successfully detect and track the spills of various sizes and movements.

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Haraguchi, Tetsunori, i Tetsuya Kaneko. "A Study on Suspension Geometry for Personal Mobility Vehicles (PMVs) with Inward Tilt Mechanism". W The Evolving Scholar - BMD 2023, 5th Edition. The Evolving Scholar - BMD 2023, 5th Edition, 2023. http://dx.doi.org/10.59490/6506799f4a8ec6d8f1c40fd6.

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Since the concept of a Personal Mobility Vehicle (PMV) that tilts inward while turning is relatively new, there is currently a lack of theoretical considerations regarding the suspension mechanism. Therefore, this study aims to explore the theoretical relationship between suspension geometry and the pitching posture during turning in a PMV with two front wheels and one rear wheel that tilts inward during turns. Our findings suggest that a combination of a front telescopic suspension and a rear full trailing arm (swing arm) suspension is suitable for minimizing both the squatting pitching of the vehicle body during turns and the disturbances caused by changes in tread and tire camber angles during wheel strokes in the upright driving position from a static force balance perspective. From a dynamic perspective, there is no significant concern about pitching occurring even in cases where there may be a delay in active tilt angle tracking (PID) control when using the combination of front telescopic suspension and rear full trailing arm suspension. However, it is essential to note that a large sprung roll moment of inertia can still induce the squatting pitching.

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Ghenaiet, Adel. "Study of Sand Particle Trajectories and Erosion Into the First Fan Stage of a Turbofan". W ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22415.

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Ingestion of dust particles by aero-engines or stationary gas turbines is inevitable when operating in extremely polluted environments. The impingements of particles on the surfaces of blades cause erosion damage and permanent losses in engine performance. This paper presents a study of the particle dynamics and erosion in the first stage of a turbofan. The steady flow field through the turbomachinery components was solved separately from the solid phase. The particle trajectories computations used a stochastic Lagrangian tracking code that implements probabilistic modeling for particle size rebound and fragmentation, and considers the eddy-lifetime concept for turbulence and the complex flow features near walls. The equations of a particle motion were solved in a stepwise manner using the seventh order RK-Fehlberg technique, whereas particle tracking in different cells of the computational domain used the finite element method. Computations of particle trajectories were carried out for sand particles MIL-E5007E (0–1000 microns) at low, mid and high concentrations. As the locations of impacts were predicted, erosion contours were estimated and the subsequent blade deteriorations were assessed. The rotor blade shows a noticeable erosion of the blade leading and trailing edges almost from root to tip and a rounding of blade tip. Erosion patterns in the diffuser depict high erosion at blade leading and trailing edges and the erosion of pressure side is spreading almost from root to tip, in addition to erosion over the suction side. The actual findings may serve in improving erosion resistance of the blades in this fan stage.

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Ghenaiet, Adel. "Effects of Solid Particle Ingestion Through an HP Turbine". W ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69875.

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Modern gas turbines operate in severe dusty environments, and because of such harsh operating conditions, their blades experience significant degradation in service. This paper presents a numerical study of particle dynamics and erosion in an hp axial turbine stage. The flow field is solved separately from the solid phase and constitutes the necessary data in the particle trajectories simulations using a Lagrangian tracking model based on the finite element method. Several parameters consider a statistical description such as particle size, shape and rebound, in addition to the turbulence effect. A semi empirical erosion correlation is used to estimate erosion contours and blades deteriorations, knowing the locations and conditions of impacts. The trajectory and erosion results show high erosion rates over the pressure side of NGV near trailing edge, in addition to extreme erosion observed toward the root corner, due to high number of particles impacting with high velocities. On the suction side, erosion is mainly over a narrow strip from leading edge. Erosion in the rotor blade is shown along the leading edge and spreading over the fore of the blade suction side, owing to a flux of particles entering at high velocities and incidence. On the pressure side, regions of dense erosion are observed near the leading edge and trailing edge as well as the tip corner. Critical erosion spots seen over NGV and rotor blade are signs of a premature failure.

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Ghenaiet, Adel. "Study of Particle Ingestion Through Two-Stage Gas Turbine". W ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25759.

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This paper presents a numerical study of particle laden gas flow through a two-stage hp axial turbine, by means of an in-house code based on the Lagrangian tracking model and the finite element method. As fly-ash solid particles trajectories and locations of impacts are predicted, the local erosion rates and the deteriorations of blades are assessed. The computed trajectories provide a detailed description of particles behaviors and reveal that particle impacts on the aft of vane pressure side usually lead to significant variations in the directions of particles to the next rotor blade, and subsequently particles impact the suction side. The plots of equivalent erosion rates indicate the vanes and blades locations which suffer more erosion. The first vane pressure surface is impacted more than any other component, but higher rates are seen at the top corner from trailing edge. The critical regions of erosion wear in the first rotor are observed over the top of blade leading edge extending along the tip as well as a rounding of the top corner from trailing edge. In the second vane, the regions of higher erosion are revealed over the last third of leading edge and the top corner extending along tip. The erosion in the second rotor is over a large area of suction side till the tip corner. The predicted areas of extreme erosion, also shown by the deteriorated profiles, are indicators for anticipated vanes and blades failures.

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