| Title |
Evaluation of Local Loss Coefficients for Different Waveguide-Below-Cutoff (WBC) Arrays of Electromagnetic Pulse (EMP) Shied in Buildings |
| Authors |
Seung Ki Pang ; Young Tae Chae |
| DOI |
https://dx.doi.org/10.6110/KJACR.2017.29.7.366 |
| Keywords |
도파관 ; 전자기파차폐 ; 압력변동 ; 국부저항계수 ; 전산유체역학 Waveguide below cutoff arrays ; EMP shield ; Pressure drop ; Local loss coefficient ; Computational fluid dynamics |
| Abstract |
The objective of this study was to characterize Waveguide-Blow-Cutoff (WBC) array for Electromagnetic Pulse (EMP) shield in air duct or water pipe, the typical pathway of pulse in indoor space with critical electronic device. A numerical investigation with three different WBC designs (circular, rectangular, and hexagonal or honeycomb) was conducted to satisfy recommended shielding effectiveness (SE) levels from 80 dB to 140 dB. Pressure drop between upstream and downstream of EMP shields based on WBC arrays was also investigated to understand air flow feature in air duct of HVAC system. Results showed that honeycomb geometry outperformed other shapes in terms of reducing the depth of EMP shield, thus providing better air flow in duct path with lower local loss coefficient in HVAC system under SE requirements. |