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针对CH_4这种特别气体,对其实验结果运用数字化处理方法研究CH_4稳定性.在内径50.8 mm圆形管道内获得CH_4+2O_2预混气在不同初始压力条件下的胞格爆轰结果并使用烟膜记录,且测得的平均爆轰速度数据与CJ爆轰速度接近,在初始压力高于5 k Pa时爆轰可稳定传播.烟膜上形成的三波点轨迹十分不规则.为减少人为误差,使用改进后的数字化处理烟膜图像的技术方法,从烟膜轨迹中得出柱状图及自相关函数结果,发现CH_4+2O_2是一种爆轰十分不稳定的气体,并给出CH_4+2O_2预混气的爆轰胞格尺寸及差距,结果显示人为测量结果偏大而数字化处理方法更为准确.这种方法能计算CH_4+2O_2预混气胞格尺寸及不稳定度,完善了定量化预混气不稳定程度的方法.
Aiming at the special gas of CH_4, the experimental results were studied by using digitalization method to study the stability of CH_4. The cell detonation results of CH_4 + 2O_2 premixed gas under different initial pressure were obtained in a circular pipe with internal diameter of 50.8 mm, Film, and the average detonation velocity measured data and CJ detonation velocity close to the initial pressure is higher than 5 k Pa detonation can be a stable propagation of the three-wave point on the film is very irregular trajectory to reduce human error Using the improved method of digitizing the film, the histogram and autocorrelation function were obtained from the film track. It was found that CH_4 + 2O_2 was a very unstable gas with detonation, and CH_4 + 2O_2 Premixed gas detonation cell size and the gap, the results show that the human measurement results are large and more accurate digital processing method.This method can calculate the CH_4 + 2O_2 premixed gas cell size and instability, improve the quantitative Pre-mixed gas instability method.