基于可视化激波管的甲烷着火过程均质性解析  

Analysis of Homogeneity of Methane Ignition Processes in Visible Shock Tube

作　　者：衡怡君 梁俊杰 张尊华[1,2] 李格升[1,2] 余福林[2] Heng Yijun;Liang Junjie;Zhang Zunhua;Li Gesheng;Yu Fulin(Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]高性能船舶技术教育部重点实验室(武汉理工大学),湖北武汉430063 [2]武汉理工大学船海与能源动力工程学院,湖北武汉430063

出　　处：《内燃机学报》2023年第6期481-489,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(52171321);中央高校基本科研业务费专项资金资助项目(2020IVA013)。

摘　　要：利用高速摄像机拍摄了激波管内甲烷的自着火过程,并结合压力和CH信号曲线试验值、模拟值的比较,分析了甲烷着火过程的均质程度,其中,初始压力和当量比分别为1.07 MPa和0.5.结果表明:甲烷在初始温度为1 547 K下发生均质着火,着火位置接近端壁.而温度为1 286 K下甲烷发生非均质着火,管内出现明显的预着火点,且面积逐渐增大进而传播引燃未燃区,着火位置距端壁较远;同时,压力和CH信号迅速上升对应时刻的试验值和机理预测值之间差异较大,仅依靠试验采集的压力和CH信号不易准确判断激波管内甲烷是否存在预着火.此外,甲烷着火过程的均质性与反射激波后测试区温度均匀性呈强相关.The self-ignition processes of methane in a shock tube were recorded using a high-speed digital camera,and the homogeneity of the methane ignition processes was analyzed in combination with experimental and modeled results of pressure and CH chemiluminescence.During experiment and analysis,the initial pressure and equivalence ratio are 1.07 MPa and 0.5,respectively.The result shows that,at initial temperature of 1547 K,a homogeneous ignition occurs to methane and the ignition location is near the endwall of the shock tube.In contrast,at 1286 K,the ignition of methane tends to be inhomogeneous.At such temperature it is found that an obvious pre-ignition region forms and then propagates to ignite other unburned region in the shock tube,and the ignition location is farther from the endwall of the shock tube.Besides,the experimental results of time points at which pressure and CH chemiluminescence rise rapidly deviate remarkably from the corresponding modeled results,and it is not easy to determine if there is a pre-ignition region for methane ignition in the shock tube merely based on experimental values of pressure and CH signals.In addition,the homogeneity of the methane ignition process is strongly related to the temperature homogeneity in the test area behind the reflected shock wave.

关 键 词：可视化激波管 甲烷 着火均质性 温度均匀性 

分 类 号：TK407.9[动力工程及工程热物理—动力机械及工程]