Analysis of Transmission and Diffraction Effects of Air Shock Wave upon Flexible Anti-blast Wall
Journal Title: Scholars Journal of Engineering and Technology - Year 2014, Vol 2, Issue 5
Abstract
In order to study the transmission and diffraction phenomena of air shock wave impacting upon a flexible wall, FE models were set up to conduct numerical simulations of air blast pressure flow field by LS-DYNA software. The weights of TNT charge used in simulation were 5kg, 10kg, 15kg and 20kg respectively. The transmission and diffraction phenomena of air shock wave behind the flexible wall were analyzed and variations of pressure time history were compared. Finally, the air blast pressure distributions of transmission and diffraction wave behind the wall were presented. The results show that there are two major peak pressures behind the flexible wall. One is the transmission pressure and the other is the diffraction pressure. Transmitted pressure is caused by the motion of the deformed wall and depends on the wall’s deformation rate. Diffraction pressure is caused by the diffraction of air shock wave propagated over the wall. The distributions and variations of transmission pressure and diffraction pressure are different, and the analyses about them should be treated differently. Keywords: Blast; Air shock wave; Anti-blast wall; Transmission pressure; Diffraction pressure
Authors and Affiliations
Zhang Yao, Nian Xinzhe, Yan Dongjin
Keywords
Related Articles
- EP ID EP385094
- DOI -
- Views 85
- Downloads 0
Numerical Simulation of Straight Cylindrical Supersonic Exhaust Diffuser for High Altitude Rocket Engine
Abstract:A numerical analysis is carried out to determine the flowfield and starting characteristics of a straight cylindrical supersonic exhaust diffuser of a high-altitude simulation of a high expansion ratio rocket no...
E-Agricultural Concepts for Improving Productivity: A Review
In the modern context, Information and Communications Technology can be simply defined as a collection of technologies that assist in storing, processing, dissemination and communication of data or information or both. T...
Analysis of the Physical and Chemical Properties of Peat Fires
Forest fire and peat fires in Indonesia is an important factor air pollution in Southeast Asia. Emissions from peat fires cause extraordinary impact for human health, visibility, the economy and affect global climate. Th...
Weighted Vertex PI Index for Some Special Graphs
The Padmakar-Ivan (PI) index is a Wiener-Szeged-like topological index which reflects certain structural features of organic molecules. Each structural feature of such organic molecule can be expressed as a graph. In thi...
Adsorption Kinetics and Thermodynamics Study for the Removal of Anionic Dye Eosin-B From Aqueous Solution by Anion Exchange Membrane: Adsorption Kinetics and Thermodynamics
Abstract: Batch adsorption of anionic dye Eosin-B (EB) from aqueous solution on anion exchange membrane (EBTAC) has been studied at ambient temperature. The influence of contact time, membrane dosage, ionic strength and...