Numerical investigation of performance improvement of the co-flow jet electric airplane

Yunchao Yang, Gecheng Zha

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


The Co-Flow Jet (CFJ) flow control is a promising technology that can achieve high wing loading and aerodynamic efficiency at cruise and ultra-high lift coefficient at takeoff/landing. A conceptual electric airplane design utilizing CFJ flow control (CFJ-EA) was designed by Lefebvre and Zha [1]. Recently, the super lift coefficient (SLC) of CFJ airfoil that exceeds theoretical lift coefficient limit was achieved at ultra-high angle of attack (AoA) [2]. The purpose of this paper is to present an improved design of CFJ-EA (CFJ-EA2) with the performance improvement in takeoff/landing lift coefficient and cruise efficiency. The wings of CFJ-EA2 utilize a super-lifting CFJ airfoil and a modified high-efficiency CFJ cruise airfoil for takeoff/landing and cruise respectively. The CFJ-EA2 wings are designed to be pivotable to achieve ultra-high lift coefficient at high AoAs for takeoff/landing and high aerodynamic efficiency at lower AoAs for cruise. For the takeoff/landing condition, the 3D steady RANS simulations are performed at the AoAs of 30°, 40°, and 50°with the Cµvarying from 0.2 to 0.6. It indicates that using the super-lifting airfoil, the CFJ-EA2 can achieve a maximum lift coefficient of 6.9 at a high AoA of 50°. For the cruise condition, an improved CFJ cruise airfoil is utilized on the CFJ-EA2 to have a higher wing loading and better cruise efficiency. The lift coefficient of CFJ-EA2 wings is 1.59 and the wing loading is increased to 214 kg/m2The aerodynamic efficiency (L/D)cis increased to 31 and the productivity efficiency (CL 2/CD)cis 50, which is 51% higher than the previous design. The gross weight of CFJ-EA2 is 2289 kg because of its high wing loading; and the range is extended to 531 nm due to higher cruise efficiency and more batteries installed.

Original languageEnglish (US)
Title of host publication2018 Applied Aerodynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105593
StatePublished - 2018
Event36th AIAA Applied Aerodynamics Conference, 2018 - [state] GA, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name2018 Applied Aerodynamics Conference


Other36th AIAA Applied Aerodynamics Conference, 2018
Country/TerritoryUnited States
City[state] GA

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering


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