Electrical behaviour of ceramic composite materials for aero-engine igniters |
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| Institution: | 1. Engine Test and Evaluation Team, Korea Aerospace Research Institute, 169-84 Gwahak-ro, Yuseong-gu, Daejeon 34133, South Korea;2. Department of Mechanical Engineering, Hanbat National University, 125 Dongsedae-ro, Yuseong-gu, Daejeon 34158, South Korea;3. Department of Aerospace Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, South Korea;1. School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, PR China;2. Tsinghua University, Beijing 100084, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China;2. Nanjing Sanle Electronic Information Industry Group Co., Ltd., Nanjing 211800, PR China;1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16846-13114, Iran;2. Instituto de Ciencia de Materiales de Sevilla (CSIC-US), Americo Vespucio 49, 41092 Sevilla, Spain;1. Departments of Pediatrics, Pathology, Microbiology, and Immunology and Vanderbilt Vaccine Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA |
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| Abstract: | High energy igniters are extensively used in aero-engines and this study describes the specific ceramic composite materials used at the igniter tips. These ceramics favour the formation of a plasma-like process on their surfaces under an electrical field not exceeding 1 kV mm−1. The elevated temperature which is reached, and the high energy released during sparks are very favourable for engine ignition, even when internal engine temperature, pressure and fuel flow are unfavourable. Currently used ceramics and possible igniter designs are described. For composite ceramics, the physical mechanisms involved during sparking are presented, together with the high temperature and pressure effect in engines. Degradation mechanisms of materials are also examined to understand the operational life of igniters when working conditions vary. Problems associated with continuous ignition and the type of surface discharge materials are also discussed. |
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