气相爆震波马赫反射转变机理的实验研究

发布时间：2018-03-24 15:04

本文选题：气相爆震　切入点：马赫反射　出处：《推进技术》2016年04期

【摘要】：在矩形爆震管道中,选用具有规则胞格结构的高浓度氩气稀释稳态气体C2H2-2.5O2-8.17Ar及不规则胞格结构的非稳态气体C2H2-5N2O,利用纹影和烟膜实验对CJ爆震状态下的爆震波发生马赫反射的转变机理进行了研究。在楔角为30°,5k Pa初始条件下,C2H2-2.5O2-8.17Ar马赫反射转变时马赫杆临界高度约为1.25cm,过驱胞格结构出现的最小距离略小于胞格长度的1/3;C2H2-5N2O马赫反射转变时马赫杆临界高度约为1.5cm,由于其胞格结构不规则,故难以衡量过驱胞格结构出现的位置。实验结果表明:爆震波马赫反射三波点运动轨迹特征为在初始阶段遵循无反应冲击波理论,随后马赫反射发生转变使得运动轨迹逐渐平行于反应冲击波理论,从而验证了爆震波开始形成前导激波马赫反射,由于CJ区域内三波点的介入引起扰动,最终在马赫反射区形成过驱爆震的过程。
[Abstract]:In a rectangular detonation pipe, High concentration argon diluted steady gas C2H2-2.5O2-8.17Ar and irregular C2H2-5N 2O with regular CJ structure were selected. The transformation mechanism of Mach reflection of detonation wave under CJ detonation state was studied by schlieren and smoke film experiments. When the wedge angle is 30 掳/ 5kPa, the critical height of Mach rod is about 1.25 cm during the Mach reflection transition of C2H2-2.5O2-8.17Ar, and the minimum distance of overdrive lattice structure is slightly smaller than that of Mach rod during the reflection transformation of C2H2-5N2O Mach with the length of C2H2H2-5N2O. About 1.5 cm, due to its irregular cellular structure, Therefore, it is difficult to measure the location of the overdrive lattice structure. The experimental results show that the trajectory of the three-wave point of detonation wave reflection follows the theory of non-reactive shock wave in the initial stage. Then the Mach reflection transition makes the trajectory of motion gradually parallel to the response shock wave theory, which verifies that the detonation wave begins to form the leading shock wave Mach reflection, which is disturbed by the intervention of three wave points in the CJ region. Finally, the process of flooding and detonation was formed in the Mach reflection region.
【作者单位】：南京理工大学机械工程学院;
【基金】：国家自然科学基金(11172141)
【分类号】：O381

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