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首页> 外文期刊>Journal of Aerospace Sciences and Technologies >SOME PRACTICAL HINTS ON PRESERVATION OF AIRCRAFT ENGINES USING A RIG FROM CORROSION PROBLEMS
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SOME PRACTICAL HINTS ON PRESERVATION OF AIRCRAFT ENGINES USING A RIG FROM CORROSION PROBLEMS

机译：从腐蚀问题使用钻井平台保存飞机发动机的一些实用技巧

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Aircrafts need to be grounded for want of routine scheduled maintenance and inspection after certain period of flying hours. During such maintenance practices, the turbo-propeller engines are kept dismantled, un- installed and non-operative conditions for a longer period even up to two years. During this non-operative period, the engines and components are susceptible to extensive chronic corrosion hazards. To prevent this hazard, the engines and components are required to be preserved both internally and externally from corrosion that is the engine components such as turbine, turbine blades, compressor, fuel nozzles, fuel system pipelines, diffuser, combustion cum mixing chamber, expansion nozzle and exhaust manifold. Over the long experience of operating the aircrafts, it has been observed that the appliance provided by the manufacturer is only meant for internal corrosion preservation purposes of the operative and installed engines and cannot be used for external corrosion preservation of non-operative and un installed engines which led to drastic reduction of engine lives and unsafe operating conditions to the aircrafts due to inherent materialistic corrosive effects. The material of the turbine blades could not able to withstand its designed high combustion temperature due to the corrosion problems, which leads to unsafe engine conditions. The problem was attributable to the design factor that the high pressure cock in the fuel supply system could open and allow the preservative oil to enter into the main fuel system only when sufficient oil pressure is built up in associative oil system, which needs rotating the engines at least in idling speeds. Simulating this mandatory condition is not possible for the non-operative uninstalled engines. To overcome the corrosion hazard problem of aircraft engines, a bogie hinge joint flushing device has been designed, fabricated and tested using the local resources after taking into consideration of this important engine external preservation requirements, layout of the turbo-propeller engine power plant and fuel supply systems. This innovative external preservation rig has got multiple options coupled with internal preservation for preserving the engine components such as turbine, turbine blades, compressor, fuel nozzles, fuel system pipelines, diffuser, combustion cum mixing chamber, expansion nozzle and exhaust manifold during the course of long maintenance period. The newly designed and developed external preservation rig has resulted in achieving the complete external preservation requirements of following categories of turbo-propeller engines, a) New/overhauled engines in storage and kept on expiry of preservation life b)lnstalled engine required to be removed for storage but cannot be cranked or rotated c) Installed engines that are not in running condition/installation-seized engines d) Uninstalled engine for defect investigations/defect rectifications e) Non operative unsafe engines
机译：飞机需要经过一定的飞行时间后，才能进行常规定期维护和检查，因此需要将飞机停飞。在此类维护实践中，涡轮螺旋桨发动机的拆卸，未安装和不工作状态会保持更长的时间，甚至长达两年。在此非运行期间，发动机和组件容易受到广泛的慢性腐蚀危害。为了防止这种危险，需要对发动机和零部件的内部和外部进行防腐处理，以防止腐蚀发动机零部件，例如涡轮机，涡轮叶片，压缩机，燃料喷嘴，燃料系统管道，扩散器，燃烧混合室，膨胀喷嘴。和排气歧管。在飞机的长期运行经验中，已经观察到制造商提供的设备仅用于在役和已安装发动机的内部防腐目的，而不能用于在役和未安装发动机的外部防腐作用由于固有的物质腐蚀作用，这导致了发动机寿命的急剧减少以及飞机的不安全运行条件。由于腐蚀问题，涡轮叶片的材料无法承受其设计的高燃烧温度，这会导致不安全的发动机状况。该问题归因于以下设计因素：只有在联合机油系统中建立了足够的机油压力时，燃油供应系统中的高压旋塞才能打开，并允许防腐油进入主燃料系统。至少在怠速下。对于无法运行的未卸载引擎，无法模拟此强制性条件。为了克服飞机发动机的腐蚀危害问题，在考虑到这一重要的发动机外部保存要求，涡轮螺旋桨发动机动力装置的布局和燃料后，利用当地资源设计，制造和测试了转向架铰接接头冲洗装置。供应系统。这款创新的外部防腐设备具有多种选择，并带有内部防腐功能，可在以下过程中对发动机部件进行维护，例如涡轮，涡轮叶片，压缩机，燃料喷嘴，燃料系统管道，扩散器，燃烧暨混合室，膨胀喷嘴和排气歧管。维护周期长。新设计和开发的外部防腐设备已满足以下类别的涡轮螺旋桨发动机的完整外部防腐要求：a）储存中的新/大修发动机，并保持其使用寿命到期b）需要拆除的旧式发动机储存，但不能摇动或旋转c）已安装的未处于运行状态的发动机/已安装的发动机d）未安装的发动机以进行缺陷调查/纠正缺陷e）无法运行的不安全发动机

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