Numerical Study on Effect of Entrance Curvature on Blast Valve Location in Duct

Numerical Study on Effect of Entrance Curvature on Blast Valve Location in Duct
  IJETT-book-cover           
  
© 2025 by IJETT Journal
Volume-73 Issue-7
Year of Publication : 2025
Author : Rajeev Jain, Pankaj Kumar Sharma, Amit Kumar Gupta, D R Hipparkar
DOI : 10.14445/22315381/IJETT-V73I7P128

How to Cite?
Rajeev Jain, Pankaj Kumar Sharma, Amit Kumar Gupta, D R Hipparkar, "Numerical Study on Effect of Entrance Curvature on Blast Valve Location in Duct ," International Journal of Engineering Trends and Technology, vol. 73, no. 7, pp.357-368, 2025. Crossref, https://doi.org/10.14445/22315381/IJETT-V73I7P128

Abstract
A passive blast valve is essential for a hardened structure to protect against blast waves. It is mounted on the duct entrance and is designed for a reflective blast wave instead of an incident wave, making it bulky and sluggish when interacting with the blast wave. This study numerically investigates the suitable location of the blast valve for a planar blast wave incident, so that the blast valve may be designed for incident pressure instead of reflective pressure. The study also investigated the effect of different fillet radii of the entrance and conic curves at the entrance curvature on the blast wave propagation in the duct. A Two-Dimensional (2D) model was numerically simulated using LS-DYNA to determine the blast valve location. The duct of a 100 mm section was modeled as a rigid body, and the air domain was a multimaterial ALE. A conical curve was generated for the reference value of 50 mm. It was observed numerically that the peak reflective pressure value reduced substantially in the duct after covering a distance twice that of the duct section.

Keywords
Blast valve, Conic curve, Fillet Radius, Entrance curvature, Blast wave propagation.

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