Dynamic Drag Reduction Effects of Aerospikes and Aerodisks | Zendy

Rong Han | Zendy; Wei Liu | Zendy; Xiaoliang Yang | Zendy; Xinghua Chang | Zendy

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Dynamic Drag Reduction Effects of Aerospikes and Aerodisks

Author(s) -

Rong Han,

Wei Liu,

Xiaoliang Yang,

Xinghua Chang

Publication year - 2021

Publication title -

international journal of aerospace engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.361

H-Index - 22

eISSN - 1687-5974

pISSN - 1687-5966

DOI - 10.1155/2021/9370331

Subject(s) - drag , mechanics , aerodynamics , pitching moment , reduced frequency , lift induced drag , lift to drag ratio , aerodynamic drag , reduction (mathematics) , oscillation (cell signaling) , aerodynamic force , vibration , amplitude , physics , angle of attack , aerospace engineering , engineering , mathematics , geometry , acoustics , turbulence , optics , reynolds number , biology , genetics

In order to investigate the dynamic characteristics of blunt aircraft mounted with aerospikes and aerodisks in large-amplitude force-pitching, the Roe spatial scheme and the lower-upper symmetric Gauss-Seidel (LU-SGS) method with dual time step are employed for discretization of unsteady Navier-Stokes (N-S) equations. A parametric investigation on the flow fields is conducted by altering the pitching period, aerospike length, and aerodisk diameter consequently via a variable-controlling procedure. Dynamic characteristics of aerodynamic drag as well as the visualization of unsteady flow fields are achieved, and the results show that the aerodynamics of hypersonic aircraft under the condition of large-amplitude force-pitching vibration have hysteresis characteristics affected by periods of force-pitching vibration. In addition, when changing aerospike length and aerodisk diameter, the variation tendency of drag reduction efficiency is determined by the pitching angle of the oscillation process.

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