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为了研究爆震管内缓燃向爆震转变(该过程称为DDT)距离和时间,对爆震管内DDT过程进行了二维数值模拟,研究改变氧气浓度及使用辛烷和氢气双燃料对爆震管DDT距离和时间的影响。数值模拟结果表明:当氧化剂中氧气体积分数占20%~40%时,增加氧气体积分数可以缩短DDT距离和时间;当氧气体积分数大于40%时,初始火焰在极短的时间和距离发展为稳定传播的爆震波;相同条件下,使用辛烷和氢气双燃料较单一辛烷燃料能获得更短的DDT时间和DDT距离,双燃料中氢气体积分数20%时,影响效果最好。
In order to study the distance and time of detonation from detonation to detonation in detonation tube (DDT), a two-dimensional numerical simulation of DDT process in detonation tube was carried out to study the effects of changing oxygen concentration and using double fuel of octane and hydrogen on detonation Effect of tube DDT distance and time. Numerical simulation results show that when the oxygen concentration in the oxidizer accounts for 20% ~ 40%, increasing the oxygen volume fraction can shorten the DDT distance and time. When the oxygen volume fraction is more than 40%, the initial flame grows in a very short time and distance as Stable propagating detonation wave. Under the same conditions, the use of octane and hydrogen bi-fuel can achieve shorter DDT time and DDT distance than the single octane fuel. When the hydrogen content in dual-fuel is 20%, the effect is best.