Using Instantaneous Spectra to Determine Dominant Species in the DDT Process of Epoxypropane
LI Ping1, 2, HU Dong2, 3, YUAN Chang-ying2, 4, DAI Song-hui1, XIAO Hai-bo1
1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China 2. Institute of High Temperature and High Pressure Physics, Sichuan University, Chengdu 610065, China 3. Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang, 621900, China 4. Physics Department, Southwest University of Science and Technology, Mianyang 621002, China
Abstract：After solving problems of weak light detection, the calibration of the spectral sensitivity of the measuring system, and the synchronization of the measuring system, instantaneous emission spectra of epoxypropane in the process of deflagration to detonation transition (DDT) with the exposure time of 2-8 μs and the resolution of 0.2 nm were acquired from six different side windows of an explosion shock tube. Using the corrected spectral data, curves of the optical radiant intensity of main reaction products versus the DDT distance from the ignition point were obtained. These curves provided information about the evolution of the reaction and the products during the DDT process. Results indicate that the chemical reaction rate of the gaseous fuel and the corresponding concentrations of intermediate products increased gradually at the deflagration stage, but at the moment of deflagration to detonation transition, the reaction rate increased rapidly and the concentrations!of products increased sharply. Among these main products, concentration increments of molecule CO, and radicals CHO and OH were greater than other products, which means that CO, CHO and OH are the dominant species that affect the DDT process greatly.
李萍1，2,胡栋2，3,袁长迎2，4,戴松晖1,肖海波1. 瞬态光谱法确定环氧丙烷DDT过程中起主导作用的基团[J]. 光谱学与光谱分析, 2006, 26(09): 1569-1572.
LI Ping1, 2, HU Dong2, 3, YUAN Chang-ying2, 4, DAI Song-hui1, XIAO Hai-bo1 . Using Instantaneous Spectra to Determine Dominant Species in the DDT Process of Epoxypropane . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(09): 1569-1572.
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