Turbo-electric propulsive fuselage aircraft featuring Boundary-Layer Ingestion (BLI) are considered promising candidates to achieve the emissions reduction targets set for aviation. This paper presents an analytical method capable of estimating the BLI benefit at aircraft level, enabling a quick exploration of the propulsive fuselage design space. The design space exploration showed that the assumptions regarding the underwing turbofans and BLI fan mass estimation can have an important impact on the final fuel burn estimation. The same applies to the total efficiency assumed for the electric transmission, the range of the aircraft mission, and the propulsive efficiency of the engines used as benchmark. The regional jet and short- to medium-range aircraft classes seem to be the most promising as the ingested drag and power saving are among the largest, with long-range aircraft being just behind. The future introduction of advanced technologies, which target the reduction of vortex and wave dissipation at aircraft level, could increase the potential benefit of propulsive fuselage BLI. On the other hand, the potential benefit would be decreased if more efficient and lighter ultra high bypass ratio engines were used as benchmark.

中文翻译：

---

涡轮电动推进机身飞机 BLI 的好处：使用分析方法的设计空间探索

具有边界层摄取（BLI）功能的涡轮电动推进机身飞机被认为是实现航空减排目标的有希望的候选者。本文提出了一种能够在飞机层面估计 BLI 效益的分析方法，从而能够快速探索推进机身设计空间。设计空间探索表明，关于翼下涡扇和 BLI 风扇质量估计的假设可能对最终燃料燃烧估计产生重要影响。这同样适用于假定的电力传输总效率、飞机任务的范围以及用作基准的发动机的推进效率。支线喷气式飞机和中短程飞机似乎是最有希望的，因为吸入的阻力和节能是最大的，远程飞机紧随其后。未来引进先进技术，旨在减少飞机层面的涡流和波浪耗散，可能会增加推进机身 BLI 的潜在优势。另一方面，如果以更高效、更轻的超高涵道比发动机为基准，则潜在收益会降低。