管道內(nèi)甲烷爆炸火焰?zhèn)鞑ヌ匦缘膶?shí)驗(yàn)與數(shù)值模擬研究
發(fā)布時(shí)間：2018-06-04 19:46
本文選題：甲烷爆炸 + 火焰?zhèn)鞑ヌ匦?/strong>�。� 參考：《西安科技大學(xué)》2015年碩士論文
【摘要】：在工業(yè)生產(chǎn)和生活中甲烷爆炸是一種主要災(zāi)害形式,而且爆炸事故一旦發(fā)生將難以控制。故研究管道內(nèi)甲烷爆炸火焰?zhèn)鞑ヌ匦?能為預(yù)防管道及受限空間內(nèi)甲烷爆炸事故的發(fā)生提供基礎(chǔ)研究。本文運(yùn)用可視化火焰?zhèn)鞑?shí)驗(yàn)系統(tǒng),在長(zhǎng)80mm×寬80mm×高600mm的豎直小尺寸爆炸燃燒管道內(nèi)對(duì)不同濃度甲烷爆炸火焰?zhèn)鞑ヌ匦赃M(jìn)行了實(shí)驗(yàn)研究;利用Matlab軟件的圖像處理功能,對(duì)實(shí)驗(yàn)拍攝的火焰?zhèn)鞑D片進(jìn)行分析得到了火焰?zhèn)鞑ニ俣?利用專業(yè)氣體爆炸模擬軟件FLACS,數(shù)值模擬了不同泄爆條件下甲烷爆炸火焰?zhèn)鞑ヌ匦�。結(jié)果表明,此爆炸燃燒管道內(nèi)甲烷爆炸范圍為5.5%-15.5%,爆炸感應(yīng)期隨著甲烷濃度的增加而縮短;濃度為9%-11%的甲烷爆炸火焰在豎直管道內(nèi)傳播過(guò)程中,形成典型的“tulip”火焰;爆炸火焰?zhèn)鞑ニ俣仍诒ǔ跗谙壬仙练逯岛笱杆傧陆?之后隨著火焰的傳播,火焰速度不斷震蕩;各濃度甲烷爆炸火焰?zhèn)鞑ニ俣确逯翟跐舛葹?0%時(shí)達(dá)到最大值為35m/s,且隨甲烷濃度的增加先增大后減小;爆炸火焰壓力和火焰溫度傳播過(guò)程先增大到壓力峰值后由于泄爆作用恢復(fù)至常壓常溫;甲烷爆炸壓力峰值和火焰溫度峰值都在濃度為10%時(shí)達(dá)到最大,且隨著甲烷濃度的增加先增大后減小;甲烷爆炸最大壓力值為0.498Mpa,甲烷爆炸最高火焰溫度為1690℃;基于FLACS軟件的數(shù)值模擬結(jié)果,其爆炸壓力、火焰溫度和火焰?zhèn)鞑ニ俣鹊淖兓厔?shì)與實(shí)驗(yàn)結(jié)果吻合;不同泄爆條件下甲烷爆炸火焰數(shù)值模擬結(jié)果表明,在甲烷濃度為10%時(shí),泄爆口打開(kāi)條件下甲烷爆炸火焰?zhèn)鞑ミ^(guò)程中沒(méi)有形成“Tulip”火焰;泄爆口泄爆程度越大各濃度甲烷爆炸壓力越小、爆炸火焰溫度越低、爆炸火焰?zhèn)鞑ニ俣仍娇?即T泄爆口密閉T泄爆口裝有泄爆膜T泄爆口打開(kāi)、P泄爆口密閉P泄爆口裝有泄爆膜P泄爆口打開(kāi)、V泄爆口密閉V泄爆口裝有泄爆膜V泄爆口打開(kāi)。
[Abstract]:Methane explosion is a major disaster in industrial production and daily life, and it will be difficult to control once explosion accident occurs. Therefore, studying the flame propagation characteristics of methane explosion in pipeline can provide basic research for preventing methane explosion accident in pipeline and confined space. In this paper, the flame propagation characteristics of methane explosion with different concentrations in a vertical small size explosive combustion pipe with long 80mm 脳 wide 80mm 脳 high 600mm are studied by using a visual flame propagation experimental system, and the image processing function of Matlab software is used. The flame propagation velocity is obtained by analyzing the flame propagation pictures taken in the experiment, and the flame propagation characteristics of methane explosion under different explosion conditions are numerically simulated by using the professional gas explosion simulation software FLACSs. The results show that the range of methane explosion in this explosion combustion pipeline is 5.5-15.5.The induction period of explosion shortens with the increase of methane concentration, and a typical "tulip" flame is formed during the propagation of 9- 11% methane explosion flame in vertical pipeline. The velocity of flame propagation rises to the peak at the beginning of explosion, then decreases rapidly, and then oscillates with the spread of flame. The peak value of flame propagation velocity of methane explosion reaches a maximum of 35 m / s when the concentration of methane is 10, and increases first and then decreases with the increase of methane concentration. The propagation process of explosion flame pressure and flame temperature first increases to the peak pressure and then returns to normal temperature due to the effect of explosion, and the peak value of methane explosion pressure and flame temperature reaches the maximum when the concentration is 10. With the increase of methane concentration, the maximum explosion pressure of methane is 0.498Mpaand the maximum flame temperature of methane explosion is 1690 鈩，
本文編號(hào)：1978618
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