Fluid Mechanics & Aerodynamics

Fluid Mechanics & Aerodynamics

Numerical investigation of the aerodynamics effects of fins curvature of opposite wrap-around fins and comparison with flat fins in supersonic flow

Document Type : Original Article

Authors
Amir Bagheri 1
Mahmoud Pasandide Fard 2
Ali Esmaeili 3
1 PhD student Ferdowsi University, Mashhad, Mashhad, Iran
2 Professor, Ferdowsi University, Mashhad, Mashhad, Iran
3 Assistant Professor, University Ferdowsi, Mashhad, Mashhad, Iran
Abstract
Conventional Wrap-Around Fins (WAF) have unique aerodynamic characteristics, such as changing the roll moment direction with increasing Mach number and the nonlinearity of the aerodynamic coefficients. The placement of Wrap-Around Fins against each other eliminates their aberrant and non-linear aerodynamic characteristics and provides the condition with a less complicated guidance system. In this research, the effects of curvature of Opposite Wrap-Around Fins (OWAF) on the aerodynamic performance of the projectile has been investigated. This investigation has been done numerically, and the results were compared with the wind-tunnel accessible test data, which have good accuracy. The simulation has been carried out at a Mach number of 1.5 and an angle of attack of  0 and 5 degrees, assuming a turbulent compressible flow; the physics of the flow around the fins has been investigated. The results showed that increasing fins curvature increases lift and drag coefficients by 7% and pitch moment up to 20%. Also, the fin curvature eliminate flow separation in junction of fin leading edge and body.
Keywords
Opposite Wrap-Around Fin (OWAF)
fin curvature
lift and drag coefficients
pitch moment

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Fluid Mechanics & Aerodynamics
Volume 12, Issue 1 - Serial Number 31
Spring and Summer
October 2023
Pages 27-37

  • Receive Date 16 April 2023
  • Revise Date 22 July 2023
  • Accept Date 05 August 2023
  • Publish Date 25 August 2023