Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of Initial Humidity on the Flame Propagation Rate of LPG/Air and LPG/O2/N2 Mixtures
We examined the influence of the initial humidity to the flame propagation rate of LPG/air and LPG/O2/N2 mixtures to contribute to the risk assessment of the alternative energies. The ignition chamber was 1.36 L of volume, made by SUS316 steel. The moisture was added to the chamber by introducing air or inert gas which was passed through the bubbler. The ignition was initiated by the electric spark which was generated at the gap of needle electrode. First, we found that the ignition probability of LPG decreased with adding the moisture. On the other hand, we also found that the following three effects simultaneously appeared in the LPG combustion under the presence of moisture; (1) combustion-promoting effect that the unreacted LPG reacts to the O and/or OH radicals which were decomposed from the moisture, (2) combustion-suppressing effect by cooling due to the latent heat and the sensible heat of moisture, and (3) combustion-suppressing effect due to the oxygen insufficient which was caused by adding the moisture. The present experimental results could be explained by the above three effects. Furthermore, we confirmed that the results of chemical equilibrium analysis using CHEMKIN-PRO support the above hypothesis.
Influence of Initial Humidity on the Flame Propagation Rate of LPG/Air and LPG/O2/N2 Mixtures
We examined the influence of the initial humidity to the flame propagation rate of LPG/air and LPG/O2/N2 mixtures to contribute to the risk assessment of the alternative energies. The ignition chamber was 1.36 L of volume, made by SUS316 steel. The moisture was added to the chamber by introducing air or inert gas which was passed through the bubbler. The ignition was initiated by the electric spark which was generated at the gap of needle electrode. First, we found that the ignition probability of LPG decreased with adding the moisture. On the other hand, we also found that the following three effects simultaneously appeared in the LPG combustion under the presence of moisture; (1) combustion-promoting effect that the unreacted LPG reacts to the O and/or OH radicals which were decomposed from the moisture, (2) combustion-suppressing effect by cooling due to the latent heat and the sensible heat of moisture, and (3) combustion-suppressing effect due to the oxygen insufficient which was caused by adding the moisture. The present experimental results could be explained by the above three effects. Furthermore, we confirmed that the results of chemical equilibrium analysis using CHEMKIN-PRO support the above hypothesis.
Influence of Initial Humidity on the Flame Propagation Rate of LPG/Air and LPG/O2/N2 Mixtures
Wu, Guan-Yuan (Herausgeber:in) / Tsai, Kuang-Chung (Herausgeber:in) / Chow, W. K. (Herausgeber:in) / Imamura, Tomohiko (Autor:in) / Ohtsuki, Masaya (Autor:in) / Kumata, Shota (Autor:in) / Furuya, Yuki (Autor:in) / Ohno, Reito (Autor:in) / Tanaka, Akira (Autor:in) / Kawaguchi, Akira (Autor:in)
Asia-Oceania Symposium on Fire Science and Technology ; 2018 ; Taipei, Taiwan
The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology ; Kapitel: 4 ; 43-54
01.01.2020
12 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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