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为了研究管道长度对瓦斯爆燃爆炸波前流速与超压耦合关系的影响,采用数值模拟的方法研究了封闭管道内爆炸超压与波前流速的传播特征。研究结果表明:不同长度下管道内的最终爆炸超压均趋于0.7~0.9 MPa之间;对于较短管道,流速峰值相对较小,流速峰值的下降趋势较平缓,流速在正负区间的振荡频率较快;对于较长管道,流速峰值相对较大,峰值下降趋势较快,振荡频率较慢;在15~20 m之间存在一个临界长度,当管长大于临界长度时,管道内会出现2个最低超压峰值,当管长小于临界长度时,则管内只会出现1个最低超压峰值;首次流速峰值与超压表现出良好的正比关系,通过拟合得到不同长度下首次流速峰值与超压的耦合关系。研究成果可为今后受限空间内爆炸的预防与控制提供基础理论参考。
In order to study the effect of pipeline length on the coupling between wave front velocity and overpressure in gas explosion and explosion, numerical simulation is used to study the propagation characteristics of explosion overpressure and wave velocity in a closed pipeline. The results show that the final explosion overpressure tends to be between 0.7 MPa and 0.9 MPa in different lengths of pipes. For shorter pipelines, the peak value of flow velocity is relatively small and the downward trend of peak value of flow velocity is gentle. The flow velocity oscillates in positive and negative intervals The frequency is relatively fast; for longer pipelines, the peak value of flow velocity is relatively large, the peak value is decreasing rapidly, and the oscillation frequency is relatively slow; there is a critical length between 15 and 20 m, and when the pipe length is greater than the critical length, When the tube length is less than the critical length, only one minimum overpressure peak appears in the tube. The peak value of the first velocity is in good proportion to the overpressure. The peak value of the first velocity at different length Coupling with overpressure. The research results can provide a basic theoretical reference for the prevention and control of explosions in confined space in the future.