Numerical study on the foam spraying for AFDSS applicable to initial fire suppression in large underground spaces

Jinouk Park; Yongho Yoo; Whiseong Kim

doi:10.9711/KTAJ.2021.23.6.503

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2021 Vol.23, Issue 6 Preview Page Next Page

Research Paper

Numerical study on the foam spraying for AFDSS applicable to initial fire suppression in large underground spaces 지하대공간 초동 화재진압에 적용가능한 자율형 소화체계의 폼 분사 해석 기법 연구

30 November 2021. pp. 503-516

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Abstract

Autonomous fire detection and suppression system requires advanced technology for complex detection technology and injection/control technology for accurate hitting by fire location. Also, foam spraying should be included to respond to oil fires. However, when a single spray monitor is used in common, water and foam spray properties appear different, so for accurate fire suppression, research on the spray trajectory and distance will be required. In this study, experimental studies and numerical analysis studies were combined to analyze the foam spray characteristics through the spray monitor developed for the establishment of an autonomous fire extinguishing system. For flow analysis of foam injection, modeling was performed using OpenFOAM analysis software, and the commonly used foaming agent (Aqueous Film-Forming Foam) was applied for foam properties. The injection distance analysis was performed according to the injection pressure and the injection angle according to the form of the foam, and at the same time, the results were verified and presented through the injection experiment.

Keywords

AFDSS (autonomous fire detection and suppression system)

Foam spraying characteristics

Large underground space

Fire suppression

자율형 초동소화 체계는 복합적 감지 기술 및 화재 위치별 정확한 타격을 위한 분사/제어 기술등에 대한 고도의 기술이 필요하다. 또한, 상황에 따라 유류화재에 대한 대응을 위해 폼(foam) 분사 기능이 포함하여야 한다. 다만, 단일 분사 모니터를 공용으로 사용할 시 청수와 폼(foam) 분사 특성이 상이하므로 정확한 화재 진압을 위해서는 분사궤적 및 거리에 대한 연구가 필요하다. 본 연구에서는 자율형 소화체계 구축을 위해 개발된 분사 모니터를 통한 폼 분사 특성 분석을 위해 실험적 연구와 수치해석적 연구를 복합적으로 수행하였다. 폼 분사에 대한 유동해석을 위해 OpenFOAM 해석 소프트웨어를 사용하여 모델링을 하였으며, 폼 특성은 일반적인으로 사용되고 있는 포소화약제 수성막포를 적용하였다. 폼 형태에 따라 분사압, 분사각에 따른 분사 거리 해석을 수행하였으며, 동시에 분사 실험을 통해 결과에 대한 검증 및 결과를 제시하였다.

키워드

자율형소화체계

폼 분사 특성

지하대공간

화재진압

References

Grosshans, H., Movaghar, A., Cao, L., Oevermann, M., Szasz, R.Z., Fuchs, L. (2016), "Sensitivity of VOF simulations of the liquid jet breakup to physical and numerical parameters", Computers and Fluids, Vol. 136, pp. 312-323. 10.1016/j.compfluid.2016.06.018

Korea Fire Safety Standards (2007), Standard on foam extinguishing system.

Lee, Y.H., Ryu, Y.C., Seong, J.H., Park, Y.C. (2016), "Numerical investigation of the effect of flow passage variation on the projection distance of the foam monitor", Journal of the Korea Academia-Industrial Cooperation Society, Vol. 17, No. 1, pp. 244-251. 10.5762/KAIS.2016.17.1.244

Menchini, C.P. (2013), "Experimental flow characterization and computational model development of aqueous film-forming foam (ARFF) firefighting jets", Doctoral Dissertation, West Virginia University, pp. 1-8.

National Fire Agency (2017), Technical standards for type approval and product inspection of fire extinguishing agents.

National Fire Agency (2021), Fire safety standards for fire extinguishing facilities (NFSC 105).

Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 23
No :6
Pages :503-516
Received Date : 2021-10-20
Revised Date : 2021-11-11
Accepted Date : 2021-11-11
DOI :https://doi.org/10.9711/KTAJ.2021.23.6.503

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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