Akademik Veri Yönetim Sistemi
Journal of Mechanical Science and Technology, cilt.36, sa.6, ss.2923-2936, 2022 (SCI-Expanded, Scopus)
Active flow control techniques, such as opposing jets, hold a high potential to mitigate wave drag effects in supersonic and hypersonic regimes. In literature, most of the work is related to blunt shape bodies and their aerodynamic analysis. This article focuses on using an opposing jet in a drag reduction of a slender forebody and associated changes in flight stability characteristics. Unsteady Reynolds averaged Navier-Stokes (URANS) based solver is used for flow-field modeling. The free-stream flows at a Mach of 1.6 with the jet ejection Mach of 1 is considered. Analysis of the 3D shockwave and its displacement from the surface of the body is discussed. This analysis includes the parametric study of pressure ratios (PR = 3 to 15) with increasing angles of attack (α∞ = 0° to 4°). The ejection of the jet displaces the shockwave from the leading edge of the slender forebody, which ultimately affects the body’s stability. The longitudinal flight stability characteristic of the body is studied in detail, with and without the jet’s ejection. This study indicates an improvement in the static stability coefficients (Cmαo) at low angles of attack. The dynamic stability coefficients (Cmα˙o+Cmq) are also analyzed. It is concluded that the opposing jet improves the stability characteristics of the slender forebody.