<p>Numerical investigations have been carried out on elliptic cones in supersonic flow to study the aerodynamic characteristics at higher angles of attack. These characteristics are compared with those of a sharp circular cone under similar flow conditions. Elliptic cones with different ellipticity ratios of 1.5 and 3 are analyzed and compared with a cone of circular cross section having the same base area. For both geometries under investigation, a length-to-base diameter ratio of 4.5 is taken into account. The flow Mach numbers considered are 1.97 and 2.94. The study is conducted up to an angle of attack of 50°. The numerical results are in agreement with experimental and theoretical results from the literature. The results show that elliptic cones produce a greater lift-drag ratio than circular cones for the same fineness ratio with their major axis horizontal. For the ellipticity ratio of 3 at Mach numbers of 1.97 and 2.94, the maximum lift coefficient is increased by 100% and 96% respectively. The shock shape in the azimuthal plane for the circular cone is circular, and it remains circular for the elliptic cone.</p>

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A CFD study of aerodynamic characteristics of elliptic cones in supersonic flow

  • Vinod Kotebavi,
  • Pradeep S. Jakkareddy,
  • S. Mullai Venthan

摘要

Numerical investigations have been carried out on elliptic cones in supersonic flow to study the aerodynamic characteristics at higher angles of attack. These characteristics are compared with those of a sharp circular cone under similar flow conditions. Elliptic cones with different ellipticity ratios of 1.5 and 3 are analyzed and compared with a cone of circular cross section having the same base area. For both geometries under investigation, a length-to-base diameter ratio of 4.5 is taken into account. The flow Mach numbers considered are 1.97 and 2.94. The study is conducted up to an angle of attack of 50°. The numerical results are in agreement with experimental and theoretical results from the literature. The results show that elliptic cones produce a greater lift-drag ratio than circular cones for the same fineness ratio with their major axis horizontal. For the ellipticity ratio of 3 at Mach numbers of 1.97 and 2.94, the maximum lift coefficient is increased by 100% and 96% respectively. The shock shape in the azimuthal plane for the circular cone is circular, and it remains circular for the elliptic cone.