A Numerical Investigation Of Deployable
Drag Surfaces Used For Recovery Systems
Author(s)
S. Abdolahi & M. Ebrahimi
Abstract
In this research, an investigation into the aerodynamic characteristics of a body
with deployable drag surfaces for recovery system has been carried out using
computational fluid dynamics. Two models of the body with retracted position of
drag surfaces and deployed position of drag surfaces has been considered for
studying the influence of drag surfaces on the flow structure and aerodynamic
forces. For this purpose force measurement and flow visualization for each case
has been carried out in Mach numbers 0.4 and 1.5. Validation of the results has
been done through comparing aerodynamic coefficients with results of a semiexperimental
method. A general study of the main aerodynamic coefficients
shows that at all angles of attack, the coefficient of lift decreases and the
coefficient of drag increases. Visualization of the flow structure shows a region
of separated flow upstream and a dead flow region with large vortices
downstream of the drag surfaces.
Keywords: numerical simulation, aerodynamic characteristics, recovery system,
drags coefficient, pressure distribution, shock wave, vortex.
1 Introduction
Several methods have been employed for recovery of flying objects with various
degrees of success. But the most prominent method, especially for heavier bodies
is parachute recovery [1], in which a number of parachutes are deployed in a predefined
sequence to reduce the body’s rate of descent. Physics of supersonic
flow around parachutes has its own complexities such as area oscillation and
shock wave formation [2]. The controlled deceleration of a flying body is a vital
part of many aerospace missions that involves significant technological
challenges and creative engineering solutions [3]. For many flying objects,
Keywords
numerical simulation, aerodynamic characteristics, recovery system,
drags coefficient, pressure distribution, shock wave, vortex
Related Book
Other papers in this volume
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