Shock Reduction through Opposing Jets-Aerodynamic Performance and Flight Stability Perspectives

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Rashid S., Nawaz F., Maqsood A., Riaz R., Salamat S.

APPLIED SCIENCES-BASEL, cilt.10, sa.1, 2020 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 10 Sayı: 1
  • Basım Tarihi: 2020
  • Doi Numarası: 10.3390/app10010180
  • Dergi Adı: APPLIED SCIENCES-BASEL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Agricultural & Environmental Science Database, Applied Science & Technology Source, Communication Abstracts, INSPEC, Metadex, Directory of Open Access Journals, Civil Engineering Abstracts
  • Orta Doğu Teknik Üniversitesi Kuzey Kıbrıs Kampüsü Adresli: Hayır

Özet

In this research paper, investigations of counter flow (opposing) jet on the aerodynamic performance, and flight stability characteristics of an airfoil with blunt leading-edge in supersonic regime are performed. Unsteady Reynolds-Averaged Navier-Stokes (URANS) based solver is used to model the flow field. The effect of angle of attack (alpha), free-stream Mach number (M-infinity), and pressure ratio (PR) on aerodynamic performance of airfoil with and without jet are compared. The results indicate that the opposing jet reduces drag from 30% to 70%, improves the maximum lift-to-drag ratio from 2.5 to 4.0, and increases shock stand-off distance from 15% to 35% depending on flow conditions. The effect of opposing jet on longitudinal flight stability characteristics, studied for the first time, indicate improvement in dynamic stability coefficients (C-mq + C-m alpha) at low angles of attack. It is concluded that the opposing jet can help mitigate flight disturbances in supersonic regime.