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NEW CHALLENGES FOR ENGINE NACELLE COMPARTMENTS PRESSURE AND THERMAL LOADS MANAGEMENT WITH AIRCRAFT ENGINE EVOLUTION

机译:飞机发动机演变对发动机纳氏舱压力和热负荷管理的新挑战

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The improvement of civil aircraft engineperformances, consumption and acousticsignature lead the engine manufacturers toincrease both the by-pass ratio (BPR) and theoverall pressure ration (OPR) respectivelydefined as the ratio of the engine secondary fluxmass flow rate to the primary flux mass flowrate and the ratio of the pressure at the exit ofthe engine compressor to the ambient pressure.Those trends impact the engine to aircraftintegration work through technical evolutionssuch as changes of the geometricalcharacteristics with larger fans, the use of newcasing or cowling materials and warmer enginecores. It particularly affects the engine nacellezones regarding the thermal environment for themounted system items and the pressure loads onnacelle structures.The purpose of this paper is to identify andanalyze technical risks for nacelle ventilationand propulsion system items thermalintegration.The rise of the BPR induces a decrease ofthe engine secondary flow pressure also calledfan pressure ratio (FPR) and thus degrades theengine core compartment ventilation majorsource.The increase of OPR allowed by the use ofnew materials (alloys, ceramics) and coreinternal cooling technologies involves engineprimary flow temperature and pressure rise.On one hand, the combined effect of a lossof nacelle cooling performances and higher heat sources generates a more stringent thermalenvironment for the system items and structureslocated in the nacelle core compartment. On theother hand the increase of primary fluxpressures constraints more and more thenacelle design to keep on mastering the effectsof an air duct rupture as required by thecertification.Those trends are already experimented byAirbus through neo program where a moreparticular attention has been paid to the nacellecooling and the alleviation of air duct ruptureconsequences.
机译:民用飞机发动机的改进 表演,消费和声学 签名带领发动机制造商 增加旁路比(BPR)和 总压力比(OPR) 定义为发动机二次通量的比率 相对于一次通量质量流量的质量流量 速率和出口压力的比率 使发动机压缩机达到环境压力。 这些趋势影响发动机对飞机的影响 通过技术发展进行整合工作 例如几何形状的变化 具有较大风扇的特性,使用新的 外壳或整流罩材料和较热的发动机 核心。它特别影响发动机机舱 有关热环境的区域 安装的系统项目以及压力负荷 机舱结构。 本文的目的是确定和 分析机舱通风的技术风险 和推进系统项目热 一体化。 BPR的上升导致BPR的下降 发动机二次流压力也称为 风扇压力比(FPR),因此降低了 发动机核心室通风专业 来源。 通过使用以下方式允许的OPR的增加 新材料(合金,陶瓷)和芯材 内部冷却技术涉及发动机 一次流量温度和压力上升。 一方面,损失的综合影响 机舱冷却性能和更高的热源产生更严格的热量 系统项目和结构的环境 位于机舱核心舱内。在 另一方面,初级通量的增加 压力约束越来越多 机舱设计,以保持对效果的掌握 空气导管破裂的要求 认证。 这些趋势已经被实验 空中客车通过Neo计划在哪里 特别注意机舱 冷却和减轻风道破裂 结果。

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