【摘要】 利用数字化学发光成像系统对氢氧系统气相爆轰反应区结构进行直接实验观察.实验采用ICCD(Intensified Charge-Coupled Device)、DG5335延时器和中心波长312 nm、半带宽15 nm的滤光片,精确设置爆轰波、ICCD之间的同步控制,得到不同初压、不同氩稀释度的爆轰OH自发辐射光图像.结果表明:反应区在空间上不均匀,其阵面形状不是平面且随时间不断改变.马赫杆后的OH自发辐射光强较入射激波后大.随着初压升高,OH自发辐射光强增大,反应阵面也近似趋于平面.随着氩稀释度的增大,OH自发辐射光强明显衰减.更多还原

【Abstract】 The reaction zone structure of gaseous detonation in hydrogen-oxygen mixture was directly observed by digital chemiluminescence imaging technique.An ICCD(intensified charge-coupled device),a DG535 delay generator and a band-pass filter centered at 312nm with the FWHM(Full Wave at Half Maximum) of 15nm were employed in the current study.By establishing precise synchronization control system between the ICCD and the detonation wave,the images of OH self-chemiluminescence in hydrogen-oxygen mixture with different argon dilutions and initial pressures were obtained.These images show that the reaction zone is spatially and temporally changeable and the reaction front is not planar but very unstable.OH self-chemiluminescence behind the Mach stem is stronger than that behind the incident shock.With increasing initial pressure,OH self-chemiluminescence increases and the reaction front tends to be more planar.As the argon dilution increases,OH self-chemiluminescence is rapidly reduced.更多还原