Study on the "Steadiness" of Flame Spreading of Electric Wires : Verification of Dominant Factor for Melting and Gasification Processes during Cable Fires

2011 Fiscal Year Final Research Report

• Project/Area Number: 21681022
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Social systems engineering/Safety system
• Research Institution: Hokkaido University
• Principal Investigator: NAKAMURA Yuji 北海道大学, 大学院・工学研究院, 准教授 (50303657)
• Project Period (FY): 2009 – 2011
• Keywords: 電気火災 / 火炎燃え拡がり / 溶融ポリマー

Research Abstract

Steadiness of flame spread over electric wire has been studied experimentally as well as numerically(theoretically). With precise visualization and temperature measurement of wire during the flame spreading event, it is understood what is the mechanism to lead the unsteadiness and what is the condition to reach steadiness of the system. To verify this consideration, Pe-. correlation has been proposed and the verification is fulfilled. Applicability of B-number theory to describe wire combustion character was ensured via microflame study. Direct numerical simulation methodology was developed based on VOF method and enthalpy-porosity method and the precise prediction of growing event of heated molten polymer was successfully accomplished.

Research Products

• [Journal Article] Ignition-to-spread Transition of Externally-heated Electrical Wire
  • Author(s): Huang, X., Nakamura, Y., and Williams, F. A.
  • Journal Title: Proc. Combust. Inst
  • Peer Reviewed
• [Journal Article] Study on Unsteady Molten Insulation Volume Change during Flame Spreading over Wire Insulation in Microgravity
  • Author(s): Takahashi, S., Takeuchi, H., Ito, H., Nakamura, Y., and Fujita, O.
  • Journal Title: Proc. Combust. Inst
  • Peer Reviewed
• [Presentation] Heat Transfer and Dynamic Motion of Phase Change Material in Melting and Dropping Process (2012)
  • Author(s): Kim, YK., Hossain, A., and Nakamura, Y.
  • Organizer: Proc. The Eighth KSME-JSME Thermal and Fluids Engineering Conference(TFEC8)
  • Place of Presentation: Incheon, Korea
  • Year and Date: 20120300
• [Presentation] Flame Spread over Electrical Wire with Various Oxygen Concentrations (2012)
  • Author(s): Huang, X., Nakamura, Y., and Williams, F. A.
  • Organizer: Proc. Spring 2012 Meeting, Western States Section of the Combustion Institute
  • Place of Presentation: Arizona(AZ)
  • Year and Date: 20120300
• [Presentation] 溶融したポリエレンが持つ可燃物に対する着火特性 (2012)
  • Author(s): 薄木太一,中村祐二,若月薫
  • Organizer: 日本機械学会北海道学生会第41回学生員卒業研究発表講演会
  • Place of Presentation: 札幌
  • Year and Date: 20120300
• [Presentation] 急速加熱による電線被覆の燃焼・溶融挙動に関する研究 (2012)
  • Author(s): 中野多聞,中村祐二,若月薫
  • Organizer: 日本機械学会北海道学生会第41回学生員卒業研究発表講演会
  • Place of Presentation: 札幌
  • Year and Date: 20120300
• [Presentation] Modeling of Melting in Consideration of Convection Diffusion Effect inside Liquid Matter (2011)
  • Author(s): Kim, YK., Hossain, A., and Nakamura, Y.
  • Organizer: Proc. 7th SNU-HU Joint Symposium
  • Place of Presentation: Seoul, Korea
  • Year and Date: 20111100
• [Presentation] Numerical Simulation of Melting and Dropping of Phase ChangeMaterial(PCM) induced by Localized Thermal Input (2011)
  • Author(s): Kim, YK, Hossain, A., and, Nakamura, Y.
  • Organizer: Proc. 1st International Symposium on Multiscale Multiphase Process Engineering(MMPE)
  • Place of Presentation: Kanazawa, Japan
  • Year and Date: 20111000
• [Presentation] An Experimental Study on Ignition of Electrical Wire (2011)
  • Author(s): Huang, X., Nakamura, Y., and Williams, F. A.
  • Organizer: Proc. Fall 2011 Meeting, Western States Section of the Combustion Institute, Riverside(CA)
  • Place of Presentation: USA
  • Year and Date: 20111000
• [Presentation] ポリマーの局所加熱による溶融流動過程の数値シミュレーション (2011)
  • Author(s): 金洋均, Hossain Akter,中村祐二
  • Organizer: 日本混相流学会年会講演会2011講演論文集
  • Place of Presentation: 京都
  • Year and Date: 20110800
• [Presentation] Mechanism of Flame Spread of Electrical Cables (2011)
  • Author(s): Iwakami, J., Nakamura, Y., Wakatsuki, K., and Hossain, A.
  • Organizer: Poster Colloquium at 10th International Symposium on Fire Safety Science(IAFSS 2011)
  • Place of Presentation: Maryland, MD USA
  • Year and Date: 20110600
• [Presentation] EMケーブルの自立延焼特性に関する実験的検討 (2011)
  • Author(s): 中村祐二,巖上純也,若月薫
  • Organizer: 平成23年度日本火災学会研究発表会概要集
  • Place of Presentation: 東京
  • Year and Date: 20110500
• [Presentation] Microflame ; As a Model of Droplet/Spray Combustion (2010)
  • Author(s): Nakamura, Y., and Hirasawa, T
  • Organizer: Proc. 7th International Conference on Flow Dynamics(ICDF2010)(OS1 : invited talk)
  • Place of Presentation: Sendai Japan
  • Year and Date: 20101100
• [Presentation] 電線被覆材ポリエチレンの燃焼量に対する周囲雰囲気圧力変化の影響 (2010)
  • Author(s): 巖上純也,中村祐二,若月薫,伊東弘行,藤田修
  • Organizer: 日本機械学会熱工学コンファレンス2010講演論文集
  • Place of Presentation: 長岡
  • Year and Date: 20101000
• [Presentation] Novel Approach of Space Fire Research : Utilizing Low Pressure to Simulate Microgravity Fire (2010)
  • Author(s): Iwakami, J., Nakamura, Y., Wakatsuki, K., Ito, H., and Fujita, O.
  • Organizer: Proc. 8th Japan-China-Korea Workshop on Microgravity Sciences for Asian Microgravity Pre-symposium
  • Place of Presentation: Sendai, Japan
  • Year and Date: 20100900
• [Presentation] 低圧環境下における電気ケーブル延焼現象に関するモデリング (2010)
  • Author(s): 中村祐二,東谷圭祐,若月薫,伊東弘行,藤田修
  • Organizer: 平成22年度日本火災学会研究発表会概要集
  • Place of Presentation: 札幌
  • Year and Date: 20100500
• [Presentation] 東谷圭祐,若月薫,伊東弘行,藤田修,"溶融過程の電線被覆材の挙動の非定常性についての考察 (2010)
  • Author(s): 巖上純也,中村祐二,東谷圭祐,若月薫,伊東弘行,藤田修
  • Organizer: 平成22年度日本火災学会研究発表会概要集
  • Place of Presentation: 札幌
  • Year and Date: 20100500
• [Presentation] Experimental Study of Flame Spread over Electric Cables at Low Pressure (2010)
  • Author(s): Nakamura, Y., Azumaya, K., Wakatsuki, K., Ito, H., and Fujita, O.
  • Organizer: Sixth International Seminar on Fire and Explosion Hazards
  • Place of Presentation: Leeds, UK
  • Year and Date: 20100400
• [Presentation] Effect of Wire Scales on Spread Behavior in Sub-atmospheric Pressure (2009)
  • Author(s): Nakamura, Y., Azumaya, K., Wakatsuki, K., Ito, H., and Fujita, O.
  • Organizer: 6th International Symposium on Scale Modeling(ISSM-6)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 20090900
• [Presentation] A Numerical Study on Time-dependent Melting and Deformation Processes of Phase Change Material(PCM) induced by Localized Thermal Input (2009)
  • Author(s): Nakamura, Y., Azumaya, K., Ito, H., and Fujita, O.
  • Organizer: Proc. 27th International Symposium on Space Technology and Science(27th ISTS)
  • Place of Presentation: Tsukuba, Japan
  • Year and Date: 20090700
• [Book] A Numerical Study on Time-dependent Melting and Deformation Processes of Phase Change Material(PCM) induced by Localized Thermal Input (2011)
  • Author(s): Kim, YK., Hossain, A., Kim, S., and Nakamura, Y.
  • Total Pages: 523-540
  • Publisher: InTech Open Access Publisher
• [Remarks] 日本機械学会RC-D9 :次世代流体解析ソフトウェアの高機能化と産業界への普及展開に関する研究分科会(依頼講演,札幌)(2011. 10)「加熱されるポリマーの溶融・落下過程を考慮した非定常数値シミュレーション」講演依頼
  • URL: http://york-me.eng.hokudai.ac.jp/~yuji
• [Remarks] 平成23年度消防防災科学論文優秀賞受賞記念講演(招待講演,東京)(2011. 10)「電線延焼現象に対する理論予測法の提案」講演依頼
• [Remarks] COMSOLカンファレンス2010東京,招待講演(2010. 12)"Numerical Simulation of Liquefying Process of Solid PCM by using COMSOL Multiphysics"講演依頼
• [Remarks] Worcester Polytechnic Institute(Department of Fire Protection Engineering), Invited Seminar(USA)(2010. 11)" Electric Cable Fires : Ongoing Research on Small-Scale Flame Spread Tests"講演依頼
• [Remarks] 日本燃焼学会つくば地区燃焼応用研究委員会依頼講演,つくば(2009. 11)「極限状態における燃焼現象の解明に向けて」講演依頼
• [Remarks] 第51回北大祭公開講義(2009. 6)「宇宙防災研究の最前線～宇宙火災を地上場で模擬するための「あの手・この手」～」講演依頼