敞口端點火條件下甲烷-空氣爆炸火焰?zhèn)鞑嶒?/H1>
發(fā)布時間：2019-02-14 18:41
【摘要】：為研究敞口端點火條件下的甲烷-空氣爆炸火焰?zhèn)鞑ヌ匦?采用GB/T12474-2008氣體爆炸極限測定系統(tǒng),結合高速攝影儀,以甲烷-空氣預混氣體為實驗介質,在相同點火能量和點火位置條件下,研究了7%,9.5%,11%CH_4-Air爆炸火焰?zhèn)鞑ヌ匦约白兓?guī)律。結果表明:在半封閉實驗管道敞口端點火條件下,CH_4-Air爆炸火焰?zhèn)鞑コ尸F(xiàn)出顯著的震蕩特點,火焰鋒面在正向-反向-正向的循環(huán)中不斷向管內蔓延。自敞口端向實驗管道封閉端傳播的過程中,鋒前未燃混合氣體依次經歷了被火焰鋒面壓縮-反向拉伸-再壓縮的過程,使得預混CH_4-Air體系中CH_4的體積分數(shù)被稀釋、減小,導致后期火焰封面?zhèn)鞑ニ俣葴p小。已燃區(qū)域內水蒸氣在爆炸高溫環(huán)境和帶電離子的作用下發(fā)生分解,產生的H2和O2改變了氣體組分并使其進一步發(fā)生氧化反應,導致不規(guī)則光斑持續(xù)地出現(xiàn)-消失。
[Abstract]:In order to study the flame propagation characteristics of methane air explosion under the condition of open end ignition, the GB/T12474-2008 gas explosion limit measurement system was adopted, and the methane air premixed gas was used as the experimental medium. Under the same ignition energy and ignition position, the propagation characteristics and variation of CH4-Air explosive flame were studied. The results show that under the condition of open end ignition of semi-closed experimental pipeline, the propagation of CH_4-Air explosive flame shows obvious oscillation characteristics, and the flame front propagates continuously into the tube in the forward, reverse and forward cycle. In the process of propagating from the open end to the closed end of the experimental pipeline, the mixture gas in front of the front goes through the process of flame front compression, reverse tension and recompression, which makes the volume fraction of CH_4 in the premixed CH_4-Air system dilute. A decrease in the propagation speed of the flame cover in the later stage. The water vapor in the burned area decomposes under the environment of explosion high temperature and the action of charged ions. The H _ 2 and O _ 2 produced change the composition of the gas and make it oxidize further, which leads to the appearance and disappearance of irregular spot.
【作者單位】： 西安科技大學安全科學與工程學院;教育部西部礦井開采及災害防治重點實驗室;日喀則市安監(jiān)局;重慶三峽學院土木工程學院;
【基金】：國家自然科學基金(51304155,51674193,51504190) 陜西省重點科技創(chuàng)新團隊計劃(2012KCT-09) 陜西省科技攻關(2015SF280) 西安科技大學博士啟動基金(2013QD5048)
【分類號】：TD712.7
【相似文獻】
相關期刊論文 前3條
1 孫];孫曉剛;戴景民;;測量爆炸火焰真溫的多光譜溫度計的研制[J];光譜學與光譜分析;2011年03期
2 畢明樹;李江波;;密閉管內甲烷-煤粉復合爆炸火焰?zhèn)鞑ヒ?guī)律的實驗研究[J];煤炭學報;2010年08期
3 畢明樹;董呈杰;周一卉;;密閉長管內甲烷-空氣爆炸火焰?zhèn)鞑?shù)值模擬[J];煤炭學報;2012年01期
相關碩士學位論文 前1條
1 謝長春;管道內甲烷爆炸火焰?zhèn)鞑ヌ匦缘膶嶒炁c數(shù)值模擬研究[D];西安科技大學;2015年
，
本文編號：2422482
本文鏈接：http://www.sikaile.net/kejilunwen/anquangongcheng/2422482.html
[Abstract]:In order to study the flame propagation characteristics of methane air explosion under the condition of open end ignition, the GB/T12474-2008 gas explosion limit measurement system was adopted, and the methane air premixed gas was used as the experimental medium. Under the same ignition energy and ignition position, the propagation characteristics and variation of CH4-Air explosive flame were studied. The results show that under the condition of open end ignition of semi-closed experimental pipeline, the propagation of CH_4-Air explosive flame shows obvious oscillation characteristics, and the flame front propagates continuously into the tube in the forward, reverse and forward cycle. In the process of propagating from the open end to the closed end of the experimental pipeline, the mixture gas in front of the front goes through the process of flame front compression, reverse tension and recompression, which makes the volume fraction of CH_4 in the premixed CH_4-Air system dilute. A decrease in the propagation speed of the flame cover in the later stage. The water vapor in the burned area decomposes under the environment of explosion high temperature and the action of charged ions. The H _ 2 and O _ 2 produced change the composition of the gas and make it oxidize further, which leads to the appearance and disappearance of irregular spot.
【作者單位】： 西安科技大學安全科學與工程學院;教育部西部礦井開采及災害防治重點實驗室;日喀則市安監(jiān)局;重慶三峽學院土木工程學院;
【基金】：國家自然科學基金(51304155,51674193,51504190) 陜西省重點科技創(chuàng)新團隊計劃(2012KCT-09) 陜西省科技攻關(2015SF280) 西安科技大學博士啟動基金(2013QD5048)
【分類號】：TD712.7
【相似文獻】
相關期刊論文 前3條
1 孫];孫曉剛;戴景民;;測量爆炸火焰真溫的多光譜溫度計的研制[J];光譜學與光譜分析;2011年03期
2 畢明樹;李江波;;密閉管內甲烷-煤粉復合爆炸火焰?zhèn)鞑ヒ?guī)律的實驗研究[J];煤炭學報;2010年08期
3 畢明樹;董呈杰;周一卉;;密閉長管內甲烷-空氣爆炸火焰?zhèn)鞑?shù)值模擬[J];煤炭學報;2012年01期
相關碩士學位論文 前1條
1 謝長春;管道內甲烷爆炸火焰?zhèn)鞑ヌ匦缘膶嶒炁c數(shù)值模擬研究[D];西安科技大學;2015年
，本文編號：2422482
本文鏈接：http://www.sikaile.net/kejilunwen/anquangongcheng/2422482.html
