Study on activated mechanism of the detector in compartment fire plume
碩士 === 吳鳳科技大學 === 消防研究所 === 106 === The activated mechanism of the fixed temperature detector is mainly from the distribution of the ceiling jet and thermal convection， and the mechanism of the smoke detector is mainly derived from the soot particles produced by the combustion products in compart...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2018
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| Online Access: | http://ndltd.ncl.edu.tw/handle/kz38zk |
| Summary: | 碩士 === 吳鳳科技大學 === 消防研究所 === 106 === The activated mechanism of the fixed temperature detector is mainly from the distribution of the ceiling jet and thermal convection， and the mechanism of the smoke detector is mainly derived from the soot particles produced by the combustion products in compartment fire. In this study， the CFAST simulation results show that the detector type has a significant influence on the fire source pattern， and the spatial distribution of the compartment fire plume velocity and the thermal smoke layer is different between the different position and height of the detector， its activated mechanism has a functional relationship.
From the CFAST simulation results， it is found that the regional opening ratio has a significant influence on the moving time Space thermal smoke layer temperature distribution situation， in the detector different installation location and height， but also does not affect its start or not and the function of the relationship between time and speed.
Experimental results The working temperature of the detectoris about 96° C higher than the nominal temperature of 70 ° C. The running time of the nozzle is about 98 seconds， and the water head at 3 m from the fire source， whether on the ceiling or from the ceiling 30cm below are not normal action， showing the installation of the height of the head， the distance from the fire source will affect the speed of the detector， the study will focus on how to shorten the time to move the head to explore， expect the fire， To ensure that the water head can effectively action to extinguish the fire，reduce casualties and property damage.
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