Flame burning speeds and combustion characteristics of undiluted and nitrogen-diluted hydrogen–nitrous oxide mixtures
Flame burning speeds and combustion characteristics of undiluted and nitrogen-diluted hydrogen–nitrous oxide mixtures
复制标题
DOI：
10.1016/j.ijhydene.2011.04.232
复制
发表时间：
2011-08
影响因子：
7.2
通讯作者：
S. Bane;R. Mével;S. Coronel;J. Shepherd
中科院分区：
文献类型：
--
作者：
S. Bane;R. Mével;S. Coronel;J. Shepherd
在本研究中，对未稀释和氮稀释的H2-N2O混合物的一些爆炸性能进行了表征。在不同的混合气当量比(ϕ=0.15−1.0)、稀释度(0−55%N_2)和初始压力(20−80kPa.)下，通过实验确定了层流燃烧速度和爆炸压力升高。测量的燃烧速度被用来验证使用详细的化学动力学机理的层流燃烧速度计算。然后，这些计算被用来估计在高初始压力和低稀释条件下的燃烧速度，这些条件不能通过实验测量。结果表明，氢氧化亚氮混合气具有高达350 cm/S的层流燃烧速度和35 Mpa/m/S的压力升高系数(Kg)，并且稀薄混合气中的火焰非常不稳定，可能导致火焰加速和燃烧向爆轰转变。
In the present study, some explosive properties of undiluted and nitrogen-diluted H2–N2O mixtures were characterized. Laminar burning speeds and the explosion-induced pressure rises were determined experimentally for a range of mixture equivalence ratios (ϕ=0.15−1.0), dilutions (0−55%N2), and initial pressures (20−80kPa). The measured burning speeds were used to validate laminar burning speed computations using a detailed chemical kinetic mechanism. The computations were then used to estimate burning speeds at high initial pressure and low dilution conditions that could not be measured experimentally. The results demonstrate that hydrogen–nitrous oxide mixtures exhibit laminar burning speeds as large as 350 cm/s and pressure rise coefficients (Kg) as large as 35 MPa m/s. Also, flames in lean mixtures are shown to be highly unstable which can lead to flame acceleration and possible deflagration-to-detonation transition.