| Summary: | 碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程研究所 === 103 === An experimental study of tunnel fire with both longitudinal ventilation and water spray systems were conducted in Taiwan. The tunnel was 88 m long , 10 m wide and 8 m high. The fire used was heptane and poured in 1, 4 and 9 m2 fuel pan, Equivalent to 2.5, 10 MW and 25 MW. The ventilation system can produce cross-sectional air flow with velocity of 1.5 m/s or 2.5 m/s. The water spray system can produce distributed water with volume per minute and unit area of 6 L/min∙m2 . Four fire scenarios were applied, free burning, with water spray system, with ventilation system, and with both ventilation and water spray system. The data show that the ventilation system can strongly decreased the temperature and heat flux downstream of fires, and can make a safe environment for evacutee and fire fighters. The water spray system even enhanced the performance of ventilation system. Additionally, the ventilation can reduce the temperature of tunnel structure, although the ceiling temperature downstream of the fires was still high. The water spray system can help decrease the downstream temperature of tunnel structure. Furthermore, the ventilation system can prevent the flame spread through vehicles.
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