The Experts below are selected from a list of 20271 Experts worldwide ranked by ideXlab platform
David R Cocker - One of the best experts on this subject based on the ideXlab platform.
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characterization of chemical and particulate emissions from Aircraft Engines
Atmospheric Environment, 2008Co-Authors: Harshit Agrawal, Aniket A Sawant, Karel Jansen, Wayne J Miller, David R CockerAbstract:Abstract This paper presents a series of measurements from four on-wing, commercial Aircraft Engines, including two newer CFM56-7 Engines and two earlier CFM56-3 Engines. Samples were collected from each engine using a probe positioned behind the exhaust nozzle of the Aircraft, chocked on a concrete testing pad. The emission factors for particulate matter mass, elemental and organic carbon, carbonyls, polycyclic aromatic hydrocarbons, n-alkanes, dioxins, metals and ions are reported for four different engine power setting modes. The emissions indices of particulate matter, elemental and organic carbon are highly power dependent for these Engines. Particulate matter emission indices (g kg−1 fuel) are found to increase from 1.1E−02 to 2.05E−01 with increase in power from idle to 85%. The elemental carbon to organic carbon varies from 0.5 to 3.8 with change in power from idle to 85%. The carbonyl emissions are dominated by formaldehyde. The emission index of formaldehyde ranges from 2.3E−01 to 4.8E−01 g kg−1 fuel. The distribution of metals depends on the difference in the various Engines. The dioxin emissions from the Aircraft Engines are observed to be below detection limit.
P A Danilenko - One of the best experts on this subject based on the ideXlab platform.
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a combined model of calculating the durability of Aircraft engine high speed rolling bearings
Russian Aeronautics, 2016Co-Authors: B M Silaev, P A DanilenkoAbstract:Based on analyzing the operating conditions for high speed rolling bearings of Aircraft Engines in a medium of low viscosity fuel components, we substantiated a combined model of calculating the bearing life with respect to two criteria of efficiency, namely, the contact fatigue resistance and wear resistance of their working surfaces. An algorithmic procedure and special features of calculating the durability with respect to these criteria were shown.
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method of calculating high speed rolling bearings intended for an Aircraft engine based on considering the wear process
Journal of Friction and Wear, 2015Co-Authors: B M Silayev, P A DanilenkoAbstract:The operating conditions of high-speed rolling bearings intended for Aircraft Engines are analyzed for operation in low-viscous fuel components. The extreme operating conditions are shown. The calculation procedure of bearing durability according to two operability criteria, i.e., contact fatigue resistance and the wear resistance of their working faces are grounded. The algorithm for calculating the high-speed bearings intended for the Aircraft Engines according to the aforementioned criteria is presented.
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architecture of a multifactor conceptual model of high speed rolling contact bearing for Aircraft Engines and research guidelines
Russian Aeronautics (iz Vuz), 2014Co-Authors: B M Silaev, P A DanilenkoAbstract:We present the architecture of a conceptual, multifactor model of a high-speed rolling-contact bearing for Aircraft Engines that operates in the working liquid. We show the solutions for this model that is obtained on the basis of the comprehensive system approach by its decomposition on the second level model.
Harshit Agrawal - One of the best experts on this subject based on the ideXlab platform.
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characterization of chemical and particulate emissions from Aircraft Engines
Atmospheric Environment, 2008Co-Authors: Harshit Agrawal, Aniket A Sawant, Karel Jansen, Wayne J Miller, David R CockerAbstract:Abstract This paper presents a series of measurements from four on-wing, commercial Aircraft Engines, including two newer CFM56-7 Engines and two earlier CFM56-3 Engines. Samples were collected from each engine using a probe positioned behind the exhaust nozzle of the Aircraft, chocked on a concrete testing pad. The emission factors for particulate matter mass, elemental and organic carbon, carbonyls, polycyclic aromatic hydrocarbons, n-alkanes, dioxins, metals and ions are reported for four different engine power setting modes. The emissions indices of particulate matter, elemental and organic carbon are highly power dependent for these Engines. Particulate matter emission indices (g kg−1 fuel) are found to increase from 1.1E−02 to 2.05E−01 with increase in power from idle to 85%. The elemental carbon to organic carbon varies from 0.5 to 3.8 with change in power from idle to 85%. The carbonyl emissions are dominated by formaldehyde. The emission index of formaldehyde ranges from 2.3E−01 to 4.8E−01 g kg−1 fuel. The distribution of metals depends on the difference in the various Engines. The dioxin emissions from the Aircraft Engines are observed to be below detection limit.
Goncharenko, Andriy Viktorovich - One of the best experts on this subject based on the ideXlab platform.
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Aircraft Engines. Lecture notes (first preliminary edition)
'Flight Academy of National Aviation University', 2019Co-Authors: Goncharenko, Andriy ViktorovichAbstract:Section A. Nomenclature Topics. Section B. Heat Engines Cycles. Section C. Piston Engines. Section D. Gas Turbine Engines. Chapter by Chapter contributionThe presented LECTURE NOTES has been developed in response to the periodical requests to deliver the course on the subject of Aircraft Engines. This coarse manual is deemed useful for those who need the basics on the Aircraft Engines knowledge. Being a sketch the summary comprises fragments of the total lectures according to the plan. In correspondence to the requirements the text of the lectures can be rearranged, modified, adjusted, renewed, and enlarged to cater for needs of the customers. Some portions of the text are deliberately omitted in the electronic publication. Moreover, the LECTURE NOTES are envisaged to be contributed to the NAU Electronic Repository fragment by fragment (chapter by chapter in some shortening)
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Designed for the 1st year students of the Field of Study 27 “Transport”, Specialty 272 “Aviation Transport”, Specialization 01 “Maintenance and Repair of Aircraft and Aircraft Engines”.
National Aviation University Kyiv Ukraine, 2018Co-Authors: Goncharenko, Andriy ViktorovichAbstract:This METHOD GUIDE ON THE SELF-STUDY (SS) is contemplated in response to the needs of our students in more detailed elaborations concerning problems stated, set or given for the students’ independent work, possibly used in their course projecting, further graduation papers or even Ph.D. studies. The whole material is split into portions. Each portion is intended to cover a fraction of probable applications aimed at CONTINUING Aircraft AIRWORTHINESS or its retaining measures. The presented in this, first, PART I of the METHOD GUIDE ON THE SS problems are dedicated, and a special attention is drawn here, to the scientific component of the SS work. Specifically, the objectives of the PART I are to help students cope with the challenging problems relating to the Aircraft (A/C) technical operation in regards with the aeronautical engineering MAINTENANCE (M/T) optimal periodicities. The set of the considered problems is based upon the RECOMMENDED LITERATURE SOURCES (the list is presented, but not limited to it). The LIST OF LITERATURE at the end of the METHOD GUIDE is basic (major) and compiled in the alphabetic order with respect to the matter of supposed (assumed) importance. The REFERENCES LIST is selected, set in the order [1-144], does not pretend for completeness, but instead it is aimed at developing the students’ abilities of thinking and to analyze, contemplate in the specified directory rather than their abilities to know and memorize. However, these are very significant too. Actually, in the contemporary informative boom world, the needed or required data can easily be retrieved from the internet, found in multiple references, guidance materials [1, 69, 71, 74, 111, 112, 134, 135, 137], studies [2, 66-68, 75-88, 113-116, 119-133, 136, 139-144], dictionaries [70, 110], comprehensive books [3, 72] or monographs [64, 65, 86-88, 113, 114, 117, 118, 123] etc. The METHOD GUIDE is designed for the 1st year students of the Field of Study: 27 “Transport”, Specialty: 272 “Aviation Transport”, Specialization: 01 “Maintenance and Repair of Aircraft and Aircraft Engines”. It includes detailed solutions for obtaining reliability objective measures allowing assessing the improvements of the A/C functional system M/T process considered in reference [112].The METHOD GUIDE contains a few recommendations on the Self-Study in regards with the reliability measures to assess the Aircraft maintenance process improvements in the framework of the scientific research elements. Designed for the 1st year students of the Field of Study 27 “Transport”, Specialty 272 “Aviation Transport”, Specialization 01 “Maintenance and Repair of Aircraft and Aircraft Engines”
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Designed for the 1st year students of the Field of Study 27 “Transport”, Specialty 272 “Aviation Transport”, Specialization 01 “Maintenance and Repair of Aircraft and Aircraft Engines”.
National Aviation University Kyiv Ukraine, 2018Co-Authors: Goncharenko, Andriy ViktorovichAbstract:This METHOD GUIDE ON THE SELF-STUDY (SS) is contemplated in response to the needs of our students in more detailed elaborations concerning problems stated, set or given for the students’ independent work, possibly used in their course projecting, further graduation papers or even Ph.D. studies. The whole material is split into portions. Each portion is intended to cover a fraction of probable applications aimed at CONTINUING Aircraft AIRWORTHINESS or its retaining measures. The presented in the, second, PART II of the METHOD GUIDE ON THE SS problems are dedicated, and a special attention is drawn here, to the scientific component of the SS work. Specifically, the objectives of the PART II are to help students cope with the challenging problems relating to the Aircraft (A/C) technical operation in regards with the aeronautical engineering MAINTENANCE (M/T) optimal periodicities. The set of the considered problems is based upon the RECOMMENDED LITERATURE SOURCES (the list is presented, but not limited to it). The LIST OF LITERATURE at the end of the METHOD GUIDE is basic (major) and compiled in the alphabetic order with respect to the matter of supposed (assumed) importance. The REFERENCES LIST is selected, set in the order [1-144], does not pretend for completeness, but instead it is aimed at developing the students’ abilities of thinking and to analyze, contemplate in the specified directory rather than their abilities to know and memorize. However, these are very significant too. Actually, in the contemporary informative boom world, the needed or required data can easily be retrieved from the internet, found in multiple references, guidance materials [1, 69, 71, 74, 111, 112, 134, 135, 137], studies [2, 66-68, 75-88, 113-116, 119-133, 136, 139-144], dictionaries [70, 110], comprehensive books [3, 72] or monographs [64, 65, 86-88, 113, 114, 117, 118, 123] etc. The METHOD GUIDE is designed for the 1st year students of the Field of Study: 27 “Transport”, Specialty: 272 “Aviation Transport”, Specialization: 01 “Maintenance and Repair of Aircraft and Aircraft Engines”. It includes detailed solutions for obtaining reliability objective measures allowing assessing the improvements of the A/C functional system M/T process considered in reference [112].The METHOD GUIDE contains a few recommendations on the Self-Study in regards with the Multi-Optional Functions Entropy Doctrine application to assess the Aircraft maintenance process improvements in the framework of the scientific research elements. Designed for the 1st year students of the Field of Study 27 “Transport”, Specialty 272 “Aviation Transport”, Specialization 01 “Maintenance and Repair of Aircraft and Aircraft Engines”
Claudio Montebello - One of the best experts on this subject based on the ideXlab platform.
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effect of temperature on wear mechanisms of an aluminium based abradable coating for Aircraft Engines after a dynamic interaction with a ti6al4v blade
Wear, 2020Co-Authors: Baptiste Martinet, Andrea Cappella, Sylvain Philippon, Claudio MontebelloAbstract:Abstract Small blade-casing clearances in Aircraft Engines reduce fuel consumption but increase the risks of contact interactions due to working conditions. These interactions cannot be avoided but their effects can be reduced by using abradable linings thermally sprayed inside the casings. To investigate these interactions and the mechanisms of wear deriving from them, a specific ballistic bench has been developed in order to perform representative tests of the low-pressure compressor environment (up to 270 °C) and enabling only one interaction between an aluminum-based abradable sample and a Ti6Al4V tool. Contact forces and incursion depth were measured for a nominal depth of cut of 100 μm and at a mean velocity of 125 m/s. It has been shown that the temperature affects mainly the abradable behaviour under these high-speed interactions. In addition, the wear that is resulting at high temperature is driven by a process that can be very different from the low temperature case.