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Flame quenching process in cavity based on model scramjet combustor
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作者 Yu Pan Jing Lei +2 位作者 Jian-Han Liang Wei-Dong Liu Zhen-Guo Wang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第1期73-78,共6页
The flame quenching process in combustors was observed by high speed camera and Schlieren system, at the inflow conditions of Ma = 2.64, To = 1483K, P0 = 1.65 MPa, T = 724 K and P -- 76.3 kPa. Changing process of the ... The flame quenching process in combustors was observed by high speed camera and Schlieren system, at the inflow conditions of Ma = 2.64, To = 1483K, P0 = 1.65 MPa, T = 724 K and P -- 76.3 kPa. Changing process of the flame and shock structure in the combustor was clearly observed. The results revealed that the precom- bustion shock disappeared accompanied with the process in which the flame was blown out and withdrawed from the mainflow into the cavity and vanished after a short while. The time of quenching process was extended by the cavity flame holder, and the ability of flame holding was enhanced by arranging more cavities in the downstream as well. The flame was blown from the upstream to the downstream, so the flame in the downstream of the cavity was quenched out later than that in the upstream. 展开更多
关键词 flame quenching process Cavity Model scramjet combustor
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Vacuum chamber suppression of gas-explosion propagation in a tunnel 被引量:13
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作者 JIANG Shu-guang WU Zheng-yan LI Qing-hua HE Xin-jian SHAO Hao QIN Jun-hui WANG Lan-yun HU Li-ming LIN Bai-quan 《Journal of China University of Mining and Technology》 EI 2008年第3期337-341,共5页
To control and reduce the harm of a gas explosion, a new method is proposed for suppressing gas-explosion propagation in a tunnel by using a vacuum chamber. We studied the suppression effect on gas explosions by placi... To control and reduce the harm of a gas explosion, a new method is proposed for suppressing gas-explosion propagation in a tunnel by using a vacuum chamber. We studied the suppression effect on gas explosions by placing a vacuum chamber at dif-ferent positions along the tunnel. The results indicate that: 1) the vacuum chamber can absorb the explosion wave and explosion energy as much as possible at the beginning of the gas explosion, and; 2) when the vacuum chamber is used the closer it is to the ignition source the more significant the suppression effect. In addition, by using the vacuum chamber: 1) the flame propagation velocity decreases from ultrasonic to subsonic; 2) the flame propagation distance is remarkably shortened; 3) the maximum peak value of overpressure (pm) decreases from 0.34 to 0.17 MPa or less, and; 4) the impulse of the blast wave (I) decreases from 20 to 8 kPa·s or less. 展开更多
关键词 vacuum chamber liquid venting flame quenching pressure venting IMPULSE explosion suppression
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