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- da Rocha-Schmidt, L., et al.
(författare)
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Progress Towards Adaptive Aircraft Engine Nacelles
- 2014
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Ingår i: 29th Congress of the International Council of the Aeronautical Sciences, ICAS. - : International Council of the Aeronautical Sciences.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Emissions and noise of aircraft engineshave to be significantly further reduced andefficiency further increased in the future. Onemeans is the improvement of airflow though theengine and especially so in its inlet region byproper shapes. Due to changes in the flightconditions, the optimal nacelle shape varies. Itwould thus be beneficial to be able to change thenacelle shape. Evaluations on system and enginelevels including related flow simulations supportthe identification of proper shaping parameters.Initial concepts of possible morphingtechnologies are discussed as well.
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- King, Ulrich, et al.
(författare)
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Shape adaptive technology for aircraft engine nacelle inlets
- 2016
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Ingår i: The Royal Aeronautical Society's 5th Aircraft Structural Design Conference.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The ambitious emission reduction goals defined by the Advisory Council for Aviation and Innovation in Europe (ACARE), demand new technologies enabling ways to significantly improve aircraft performance. In the European Commission funded low Technology Readiness Level (TRL) project “Morphing Enabling Technologies for Propulsion System Nacelles” (MorphElle) conducted between October 2013 and November 2015, an initial investigation took place to modify the inlet of an Ultra-High Bypass Ratio turbofan nacelle with adaptive structure technology to enhance its aerodynamic performance. The goal was to be able to adopt the inlet lip to different flight conditions and therefore, increase engine performance while at the same time reducing the aerodynamic nacelle drag. A pool of concepts for an adaptive nacelle inlet was established and a down selection was performed and the most promising identified. The selected concept was further elaborated and the impact at aircraft level was examined. Designing an adaptive structure mechanism for the circular shape of a nacelle inlet has different requirements compared to an adaptive structure mechanism, for example, a flap or a slat. For a circular shape, the deformation of the adaptive mechanism in circumferential direction has to be considered as well. A structural concept was established, which consists of flexible outer skin with pneumatic tubes as actuators, which is able to handle the deformation in circumferential direction. With this mechanism it is possible to change the inlet of the used reference nacelle geometry. Numerical tools were used to perform structural and aerodynamic simulations. The results of these simulations served as input for an aircraft assessment. The inputs were nacelle weight, nacelle aerodynamic drag and thrust specific fuel consumption of the engine. With this data an aircraft model was set up and compared to two reference aircraft. The first reference aircraft is a year 2000 reference (comparable to Airbus A330-300). The second reference aircraft is similar to an Airbus A330-300 with projected Entry-Into-Service (EIS) 2025+. For the aircraft equipped with the adaptive nacelle an EIS of 2025+ was assumed as well. The results were that the adaptive nacelle showed improved values for SFC and nacelle aerodynamic drag compared to the reference nacelle geometry. Furthermore, a first prototype of the shape adaptive mechanism as proof of concept was developed.
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- Seitz, B., et al.
(författare)
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Modern Neutron Detectors with Fast Timing Resolution
- 2020
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Ingår i: Modern Neutron Detection : Proceedings of a Technical Meeting - Proceedings of a Technical Meeting. - 1011-4289. - 9789201265203 - 9789201266200 ; :1935, s. 273-277
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Thermal neutrons are a vital imaging modality with wide ranging applications, exemplified by worldwide endeavours to construct and operate the next generation of accelerator-driven neutron sources with significantly increased neutron flux and, hence, brightness and image contrast. In addition, a high spatial resolution and information about the neutron energy is often desired. The latter is commonly provided by a time-of-flight measurement. These user-driven demands to obtain the best possible image pose significant challenges to the design of the neutron sensor system. The neutron sensor needs to be highly efficient in detecting thermal neutrons, provide the desired spatial and temporal resolution, and has to operate at high count rates. Segmented photon sensors like Multi-Anode Photo Multiplier Tubes (MAPMT) or systems based on Micro Channel Plates (MCP) have been proven in other fields to meet the demands on efficiency, rates, spatial and temporal resolution. Combining these photon sensors with suitable neutron converters, e.g. Lithium-loaded glass scintillators, will provide a neutron detection system capable of meeting the requirements of the next generation of spallation neutron sources. One system based on GS-20 scintillator coupled to a Hamamatsu H12700 MAPMT will be described in detail, as will be the concept of a system based on gadolinium-coated silicon structures coupled to a segmented electron detector.
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