Computational and Experimental Study for Reducing Forebody Wake Effect by Proper Designing of a Slit cut Square Parachute used for Sonobuoy Drop

  • Mahendra Pratap DRDO-Aerial Delivery Research and Development Establishment, Agra – 282 001
  • A. K. Agrawal Mechanical Engineering Department, Indian Institute of Technology, Varanasi – 221 005
  • S. C. Sati DRDO Chair, R&D Engineers Pune – 411 021
  • A. K. Saxena DRDO-Aerial Delivery Research and Development Establishment, Agra – 282 001
Keywords: Drag coefficient; CFD; Sonobuoy; Square canopy parachute; Slit-cuts; Suspension lines; Forebody wake

Abstract

This paper discusses the design of a square parachute based on classical approach, computational analysis and experimentation. This parachute will be used to drop directional sonobuoy on the sea to locate and classify the submarines. Design improvements are brought out by providing slits into a solid square canopy of parachute to bring in more stability and minimum drift during descend. Specifically, the effect of upstream sonobuoy, RANS model, suspension line length, canopy size and slit size in flow structure were considered. The predicted drag coefficients obtained from CFD for square canopy with slit-cuts compared with the results of wind tunnel experiment and found that the increase in the suspension-line length and/or of the surface area of the parachute canopy helps in better stability and results in the minimum drag loss.

Published
2021-09-02
How to Cite
Pratap, M., Agrawal, A., Sati, S., & Saxena, A. (2021). Computational and Experimental Study for Reducing Forebody Wake Effect by Proper Designing of a Slit cut Square Parachute used for Sonobuoy Drop. Defence Science Journal, 71(5), 594-601. https://doi.org/10.14429/dsj.71.15482
Section
Aeronautical Systems