Relevant bibliographies by topics / Allison 250

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  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
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Academic literature on the topic 'Allison 250'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Allison 250"

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Lindstedt, Paweł, and Tomasz Sudakowski. "Prediction the Bearing Reliability on Basis Diagnostic Information." Journal of Konbin 3, no. 1 (2007): 27–49. http://dx.doi.org/10.2478/v10040-008-0003-0.

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Prediction the Bearing Reliability on Basis Diagnostic Information The new complex method of diagnostics of helicopter's turbine engine Allison 250 in work was. This method be bases on complex diagnostic signals of resulting with simultaneous use three autonomic methods of diagnosing (functional diagnosing, wibroacustic diagnosing and tribologic diagnosing) and of surroundings described with number of crossings of diagnostic sill timbers of these signals. This way of description permits to establish between diagnostic signals quantitative reports and the surroundings and the state of technical
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Lee, Gavin G., William D. E. Allan, and Kiari Goni Boulama. "Flow and performance characteristics of an Allison 250 gas turbine S-shaped diffuser: Effects of geometry variations." International Journal of Heat and Fluid Flow 42 (August 2013): 151–63. http://dx.doi.org/10.1016/j.ijheatfluidflow.2013.02.004.

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DUTCZAK, Jerzy, and Janusz MAGIER. "The assessment of the technical condition of the bearing seals of the rotor shaft in a turbine helicopter engine based on the PM content in the exhaust gases." Combustion Engines 150, no. 3 (2012): 44–54. http://dx.doi.org/10.19206/ce-117030.

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The paper presents the method of measurement of the particulate matter in the exhaust gases of a Rolls-Royce Allison 250-C20B turbine engine in the aspect of the assessment of the technical condition of the bearing seals of the rotor shaft. The tests were carried out on 4 engines using a Horiba TEOM 1105 PM analyzer fitted with a mini dilution tunnel – Micro Diluter 6100. The paper also presents the method of determining of the engine technical condition index (bearing seals) developed by the authors based on the data obtained from the measurements. The reliability of the obtained results has
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Kowalski, Mirosław. "ANALYSIS OF VIBROACOUSTIC PROPERTIES OF THE 250-C20R/2 RRC (ALLISON) ENGINE IN THE SUPPORT SURFACE OF THE COMPRESSOR." Journal of KONES. Powertrain and Transport 21, no. 4 (2014): 281–88. http://dx.doi.org/10.5604/12314005.1130493.

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Vulpio, Alessandro, Alessio Suman, Nicola Casari, and Michele Pinelli. "Dust Ingestion in a Rotorcraft Engine Compressor: Experimental and Numerical Study of the Fouling Rate." Aerospace 8, no. 3 (2021): 81. http://dx.doi.org/10.3390/aerospace8030081.

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Helicopters often operate in dusty sites, ingesting huge amounts of contaminants during landing, take-off, hover-taxi, and ground operations. In specific locations, the downwash of the rotor may spread soil particles from the ground into the environment and, once ingested by the engine, may stick to the compressor airfoils. In the present work, the Allison 250 C18 engine’s multistage axial-flow compressor is employed to study the fouling rate on rotor blades and stator vanes from both numerical and experimental standpoints. The compressor is operated in a typical ground-idle operation, in term
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Ali, F., K. Tzanidakis, I. Goulos, V. Pachidis, and R. d’Ippolito. "Multidisciplinary design and optimisation of conceptual rotorcraft powerplants for operational performance and environmental impact." Aeronautical Journal 119, no. 1217 (2015): 891–914. http://dx.doi.org/10.1017/s0001924000010976.

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AbstractThis paper demonstrates the application of an integrated rotorcraft multidisciplinary design and optimisation framework, deployed for the purpose of preliminary design and assessment of optimum regenerative powerplant configurations for rotorcraft applications. The proposed approach comprises a wide-range of individual modelling theories applicable to rotorcraft flight dynamics, gas turbine engine performance and weight estimation as well as a physics-based stirred reactor model, for the rapid estimation of various gas turbine gaseous emissions. A single-objective Particle Swarm Optimi
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Lindstedt, Paweł. "The Method of Complex Worthiness Assessment of an Engineering Object in the Process of its Use and Service." Solid State Phenomena 144 (September 2008): 45–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.144.45.

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A focus of the paper is concerned with the issue that optimal actions of regulation, diagnostics and reliability tests of technical objects are required from the maintenance staff involved in their use and servicing, and on the other hand, that they are performed independently and autonomously in the current maintenance practice instead of being accomplished in a strictly coordinated and complex way. It was noticed that only one and common information on the object exists and provides a solid basis for coordination of the regulation, diagnostics and reliability tests. This information can be a
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O'Gara, E. A., D. J. Hill, and D. J. Maslin. "Activities of Garlic Oil, Garlic Powder, and Their Diallyl Constituents against Helicobacter pylori." Applied and Environmental Microbiology 66, no. 5 (2000): 2269–73. http://dx.doi.org/10.1128/aem.66.5.2269-2273.2000.

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ABSTRACT Chronic Helicobacter pylori disease is reduced withAllium vegetable intake. This study was designed to assess the in vivo anti-H. pylori potential of a variety of garlic substances. The garlic materials all showed substantial but widely differing anti-H. pylori effects against all strains and isolates tested. The MICs (range, 8 to 32 μg/ml) and minimum bactericidal concentrations (MBCs) (range, 16 to 32 μg/ml) of undiluted garlic oil (GO) were smaller than those of garlic powder (GP) (MIC range, 250 to 500 μg/ml; MBC range, 250 to 500 μg/ml) but greater than the MIC of allicin (4.0 μg
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Saito, Koichi, Masakazu Horie, Youji Hoshino, et al. "Determination of Allicin in Garlic and Commercial Garlic Products by Gas Chromatography with Flame Photometric Detection." Journal of AOAC INTERNATIONAL 72, no. 6 (1989): 917–20. http://dx.doi.org/10.1093/jaoac/72.6.917.

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Abstract A simple and rapid method has been developed for the determination of allicin in garlic and commercial garlic products by gas chromatography (GC) with flame photometric detection. Samples containing allicin are homogenized with distilled water and centrifuged. An aliquot of the superaate is cleaned up on an Extrelut column using diethyl ether as an eluant. The GC separation is carried out on a 1% OV-1 or 2% Advance DS+ H3P 0 4 column. The calibration curve was rectilinear in the range from 0.2 to 2.0 pg/mL. The overall recovery of allicin added to garlic and garlic products at 0.4 mg/
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Kanaki, Niranjan S., and M. Rajani. "Development and Validation of a Thin-Layer Chromatography-Densitometric Method for the Quantitation of Alliin from Garlic (Allium sativum) and Its Formulations." Journal of AOAC INTERNATIONAL 88, no. 5 (2005): 1568–70. http://dx.doi.org/10.1093/jaoac/88.5.1568.

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Abstract A selective, precise, and accurate high-performance thin-layer chromatographic (HPTLC) method has been proposed for the analysis of garlic and its formulations for their alliin content. The method involves densitometric evaluation of alliin after resolving it by HPTLC on silica gel plates with n-butanol–acetic acid–water (6 + 2 + 2, v/v) as the mobile phase. For densitometric evaluation, peak areas were recorded at 540 nm after derivatizing the resolved bands with ninhydrin reagent. The relation between the concentration of alliin and corresponding peak areas was found to be linear wi
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Dissertations / Theses on the topic "Allison 250"

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Romanelli, Mirko. "Modellazione del comportamento di un combustore e turbina aeronautica con fogging." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12374/.

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Tra i vari metodi di produzione di energia meccanica le turbomacchine rappresentano sicuramente uno dei metodi più sviluppati e di maggiore interesse per via del loro utilizzo in ambito aeronautico, per la produzione di energia elettrica e la movimentazione di grosse macchine motrici. A causa della loro diffusione è diventato di fondamentale importanza trovare delle metodologie per aumentarne la potenza, l'ecosostenibilità e i rendimenti. A tale scopo la tecnica del fogging rappresenta una valida opzione per cercare di raggiungere tali obiettivi. In questo elaborato è stato prima effettuato
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Allegretti, Alessandro. "Modellazione del comportamento di un compressore aeronautico in condizioni di funzionamento con fogging." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11516/.

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L'obiettivo di questo lavoro di tesi è realizzare un modello, prima statico poi dinamico, dei componenti: imbocco e gruppo compressore, del turboalbero Allison 250 C18 sottoposto alla tecnologia del fogging. I dati sperimentali utilizzati provengono da prove sperimentali svolte da un altro tesista nel laboratorio di Propulsione e macchine della Scuola di Ingegneria e Architettura di Forlì. Grazie al modello statico, realizzato con il software MATLAB®, sono state create le principali mappe prestazionali dei singoli componenti. Queste ultime sono state poi implementate all'interno del modello di
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Book chapters on the topic "Allison 250"

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Levering, Matthew. "The Old Testament Witness." In Did Jesus Rise from the Dead? Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198838968.003.0003.

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In contemporary biblical scholarship that investigates the question of whether Jesus of Nazareth was raised from the dead, scholars generally pay some attention to the Old Testament. The first part of this chapter therefore examines the findings of the New Testament scholars Dale Allison and N. T. Wright and the Hebrew Bible scholar Jon Levenson. The chapter next examines St. Thomas Aquinas’s use of the Old Testament in commenting on John 20–1, the chapters of John’s Gospel that treat Jesus’ Resurrection appearances. In his commentary, of course, Aquinas is not attempting to investigate the historicity of Jesus’ Resurrection. Commenting on John 20–1, Aquinas includes 139 quotations from the Old Testament. The chapter argues that the verses selected by Aquinas play a valuable cumulative role in supporting the truth of the claim that Jesus rose from the dead.
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Conference papers on the topic "Allison 250"

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Russom, Dennis M., William E. Masincup, and John Eghtessad. "Phase 1 Testing of the Redundant Internal Mechanical Start System for the Ship Service Gas Turbine Generator Sets on the U.S. Navy’s DDG-51 Class Ships." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-117.

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The Redundant Independent Mechanical Start System (RIMSS) is a gas turbine powered, mechanically coupled start system for the Allison AG9140 Ship Service Gas Turbine Generator Sets (SSGTGs) of the U.S. Navy’s DDG-51 Class ships. The system will be original equipment on DDG-86 and follow. It will also be a candidate for backfit onto earlier DDG-51 Class ships. This paper describes RIMSS and details a very successful phase of the RIMSS program. All U.S. Navy testing was conducted on an Allison AG9140 located at the Carderock Division, Naval Surface Warfare Center-Ship Systems Engineering Station
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Piercy, T. F., and C. E. Heathco. "Installation Requirements for Small Gas Turbine Engines." In ASME 1985 Beijing International Gas Turbine Symposium and Exposition. American Society of Mechanical Engineers, 1985. http://dx.doi.org/10.1115/85-igt-151.

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Allison currently has over 20,000 Model 250 small gas turbine engines operating throughout the world in a variety of turboprop and turboshaft installations. The experience base has contributed to the understanding and development of small engine installation requirements. Some of the critical interface systems will be reviewed to highlight some of the small engine considerations of engine installation design.
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Weiner, Dan, and Giora Meron. "Use of the Brayton Cycle in Solar Electric Power Generation." 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-101.

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The utilization of gas turbines in a central receiver is an attractive alternative due to the ability of these prime movers to endure temperatures of about 2000°F while achieving high performance. In this paper the problems of modifying a 250 kW Allison Turboshaft Engine and its conversion into solar gas turbines are presented. The various solutions referring to the various system components, such as combustion chamber, hot pipeline, electric generator and control system are detailed.
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Bouchard, D., A. Asghar, M. LaViolette, W. D. E. Allan, and R. Woodason. "Experimental Evaluation of Service-Exposed Nozzle Guide Vane Damage in a Rolls Royce A-250 Gas Turbine." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95608.

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A unique methodology and test rig was designed to evaluate the degradation of damaged Nozzle Guide Vanes in a transonic annular cascade in the short duration facility at the Royal Military College. A custom test section was designed which featured a novel rotating instrumentation suite. This permitted 360° multi-span traverse measurements downstream of unmodified turbine NGV rings from a Rolls-Royce/Allison A-250 turbo-shaft engine. Downstream total pressure was measured at four span-wise locations on both an undamaged reference and a damaged test article. Three performance metrics were develo
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D’Elia, Gianluca, and Giorgio Dalpiaz. "Incoming Stall Identification in Axial Compressors by Vibration Analysis." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12810.

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This work addresses on a complete vibro-acoustic characterization of an axial compressor with the aim to foresee the rotor instability. The tests were performed on a turboshaft Allison 250-C18. The compressor is composed of six axial stages and one centrifugal stage. Four vibration signals were simultaneously measured by means of accelerometers, while the acoustic signals were measured by means of two microphones. Two different kinds of tests have been carried out on the compressor that operates at constant speed: in the course of the first test the six signals were acquired at different posit
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Overton, Leonard L., William E. Masincup, and Jack E. Halsey. "A Mechanical Start System for U. S. Navy Destroyer Generator Sets." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-252.

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A mechanical start system has been developed to start the Ship’s Service Gas Turbine Generators (SSGTG) on board U.S. naval destroyers. The current starting system uses either stored high pressure air or bleed air from another running turbine. The U.S. Navy has reviewed the high pressure air system and found it to be a costly system for both ship construction and maintenance. As a result, the Navy is requiring an alternative starting method that will replace high pressure air. It should be noted that any alternative that introduces compressed air to start the SSGTG depends on the start air reg
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Lee, G. G. W., W. D. E. Allan, and K. Goni Boulama. "Numerical and Experimental Analysis of the Airflow Inside an A250 Diffuser Tube." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69708.

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The diffuser tube of the Allison 250 gas turbine has been investigated in this paper. It consists of a diverging conical section that transitions into a constant diameter S-shaped tube, and connects the exit of the compressor to the inlet of the combustion chamber. The shear stress transport model (SST) in ANSYS-CFX has been used for the numerical prediction of the flow and an experimental rig was built in order to collect data in four directions and at three stations along the diffuser tube. The calculated results perfectly matched the experimental data. The development of the stream-wise vel
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Aldi, Nicola, Mirko Morini, Michele Pinelli, Pier Ruggero Spina, and Alessio Suman. "Cross Validation of Multistage Compressor Map Generation by Means of Computational Fluid Dynamics and Stage-Stacking Techniques." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25278.

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Gas turbine operating state determination consists of the assessment of the modification, due to deterioration and fault, of performance and geometric data characterizing machine components. One of the main effects of deterioration and fault is the modification of compressor and turbine performance maps. In this paper, three-dimensional numerical simulations of a multistage axial compressor are carried out. As a case study, the axial sections (i.e. the first six stages) of the Allison 250-C18 axial-centrifugal compressor are considered for the numerical investigation. Simulations are performed
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Bester, Nigel, and Andy Yates. "Assessment of the Operational Performance of Fischer-Tropsch Synthetic-Paraffinic Kerosene in a T63 Gas Turbine Compared to Conventional Jet A-1 Fuel." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-60333.

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The performance implications of operating on Synthetic-Paraffinic Kerosene (SPK) were investigated using a RR-Allison T63-A-700 Model 250-C18 B gas turbine and compared to conventional Jet A-1. The SPK was aromatic–free and possessed a greater hydrogen/carbon ratio than petroleum derived Jet A-1. The variation in aromatic content had several implications with respect to soot and NOx emissions. Reduced aromatics also implied a reduction in the radiative heat transfer to the combustor liner. A simple model was used to explore the effect of H/C ratio on the adiabatic flame temperature, the combus
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Vulpio, Alessandro, Alessio Suman, Nicola Casari, and Michele Pinelli. "A Quantitative Approach for the Estimation of the Fouling Rate on the Stationary Parts of a Multistage Test Compressor." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59449.

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Abstract Gas turbine particle ingestion may lead to the deposition of contaminants in the compressor section, inducing the performance losses of the whole engine. The economic losses derived from this issue push great interest in the investigation of such a phenomenon from a numerical and experimental standpoint. This paper describes a quantitative approach to predict particle deposition on the vanes of an axial compressor starting from the flow field obtained employing CFD simulations. The results are then compared to the experiments performed on the Allison 250 C18 compressor unit subject to
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Reports on the topic "Allison 250"

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Allison-Cassin, Stacy, Sean Hillier, Alan Odjig Corbiere, Deborah McGregor, and Joy Kirchner. Perspectives on Openness: Honouring Indigenous Ways of Knowing. Chair Rosa Orlandini. York University Libraries, 2020. http://dx.doi.org/10.25071/10315/38038.

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York University Libraries Open Access Week 2020 panel discussion entitled, "Perspectives on Openness: Honouring Indigenous Ways of Knowing", moderated by Stacy Allison-Cassin, in conversation with Alan Ojiig Corbiere, Deborah McGregor, and Sean Hillier, that took place online on October 20, 2020. The theme for Open Access Week 2020 is Open With Purpose: Taking Action to Build Structural Equity and Inclusion. The basis of the discussion for the panel is the question, "In an era of open scholarship and research, how do we as a research community navigate and balance openness while respecting Ind
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