航空エンジン補機駆動ギヤの流動損失低減とオイル排出改善のための数値解析と実験

概要

論文の詳細を見る
In recent years, the demand for power generation capacity has increased considerably due to the electric drive of air conditioners and so on in the engines of civil aircraft. Therefore, it is estimated that power losses may increase in the accessory gearbox because of generators and pumps that in turn augment fuel consumption. To reduce these losses, Computational Fluid Dynamics (CFD) simulation that analyzes oil churning and windage losses was developed and improvements were made to the shrouds of bevel gears which have large losses in the gearbox. It was revealed that the loss was reduced up to 36% compared with unshrouded gears, by shrouding in the experiments. On the other hand, to assure the functional reliability of the gearbox, it is necessary to design spur gear trains of the gearbox in a manner that prevents the stagnation of oil inside the gearbox that occurs when the aircraft changes attitude. We performed CFD simulations and experiments to survey the application of flow guides to the spur gear trains. Experimental results showed that there was little oil stagnation within the improved gearbox.