Numerical Analysis of Aerodynamic Interference of Two Passing Cylindrical Bodies at Supersonic Speeds

Document Type : Propulsion and Heat Transfer

Authors

1 Corresponding author: Assistant Professor, Faculty of Mechanical Engineering, Khatam Al-Anbiya Air Defense University, Tehran, Iran

2 Assistant Professor, Faculty of Mechanical Engineering, Khatam Al-Anbiya Air Defense University, Tehran, Iran

3 M.Sc., Faculty of Mechanical Engineering, Khatam Al-Anbiya Air Defense University, Tehran, Iran

Abstract

Aerodynamic interference is one of the phenomena that occurs when two flying objects pass near each other. In this case, the change in the pressure distribution on objects passing near each other causes a change in the aerodynamic forces. In this research, the numerical investigation of the flow field between two narrow bodies at a close distance and the pressure changes along them at supersonic speeds is done. The simulation was done in two-dimensional and three-dimensional form, and the k-omega sst was used to model the flow turbulence. The two slender bodies were placed next to each other at speeds of Mach 1.5, 3, and 4.5 and at intervals of 2, 3, and 4 times the diameter of the body. they were examined in two modes with relative motion and without relative motion. The results show that as the free flow velocity increases, the shock wave deforms from bow to oblique and is reflected between the two bodies.  Also, as the flow Mach number decreases and the distance between two slender bodies increases, the reflected shock wave becomes weaker. At Mach 1.5 the shock wave reflection between two bodies is not very noticeable, while at Mach 4.5 the shock wave is well reflected between two bodies. In the state of relative motion of two slender bodies, separation occurs at the shock wave reflection points and the number of shock wave reflections decreases compared to the state without relative movement.

Highlights

  • Analyzing aerodynamic interference statically
  • Analyzing the proximity phenomenon in unsteady form and with the movement of one object in the vicinity of another object at supersonic speeds
  • Investigating the effects of aerodynamic interference on pressure distribution 

Keywords

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References

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Aerospace Mechanics
Volume 19, Issue 3 - Serial Number 73
Serial No. 73, Autumn Quarterly
December 2023
Pages 79-95

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History

  • Receive Date: 02 January 2023
  • Revise Date: 08 February 2023
  • Accept Date: 07 March 2023
  • Publish Date: 21 April 2023

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