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为研究瓦斯浓度对封闭型管道内爆炸波振荡特征的影响,用数值模拟方法分析超压波形振荡特征、超压沿管道的变化和浓度对振荡周期的影响。研究结果表明:随着瓦斯体积分数的增加,超压峰值和振幅先增大后减小,体积分数在9.5%时,具有最高的爆炸超压和最强的振荡特性。瓦斯体积分数在接近爆炸上下限时均出现多重爆炸波的振荡叠加现象,爆炸超压最大值既能发生在反射端,也能发生在爆炸波的对冲叠加点。随着瓦斯体积分数的增加,振荡周期先变短后变长,在体积分数为9.5%时具有最短的周期;振荡周期可以用拟合得到的关于浓度的多项式来计算。
In order to study the influence of gas concentration on the characteristics of explosive wave oscillation in a closed pipe, numerical simulation was used to analyze the characteristics of over-pressure waveform oscillation, the influence of overpressure along the pipe and the concentration on the oscillation period. The results show that with the increase of gas volume fraction, the overpressure peak and amplitude firstly increase and then decrease, and the highest explosion overpressure and the strongest oscillation characteristic are obtained when the volume fraction is 9.5%. When gas volume fraction approached the upper and lower bounds of the explosion, multiple oscillations superimposed on the explosion wave appeared. The maximum value of explosion overpressure occurred both at the reflection end and in the hedging point of the explosion wave. As the gas volume fraction increases, the oscillation period becomes shorter and then becomes longer. At the volume fraction of 9.5%, the oscillation period has the shortest period. The oscillation period can be calculated by fitting the fitted polynomial with respect to the concentration.