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The instable combustion or oscillation combustion which occurs in three high capacity solid rocket motors using high energy composite propellant with finocyl grain is studied. The reasons of the acoustic combustion instability are also discussed. Three engineering methods that can eliminate combustion instability are proposed and discussed. The study shows that the combustion instability mainly depends on the propellant grain shape and nozzle structure. Some measures to reduce the acoustic energy and mass generation rate of combustion gas can be adopted. The test results indicate that the modified rocket motors can significantly eliminate the instable combustion and improve the motor internal ballistic performance. 相似文献
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随着计算机视觉技术的发展,行人重识别技术得到了广泛的应用.为了有效地分析海量的行人轨迹数据的时空相关性,提出一个可扩展的可视化分析系统Hi-Geo-Ti,应用分层(hierachical)地理(geographical)时间轴(timelines)可视化系统,允许用户从海量图像存储中即时提取和可视化行人的轨迹.特别地,Hi-Geo-Ti将行人重识别产生的关联与摄像机的时空属性相结合,在此基础上创建了三维轨迹图与二维时序故事图的交互组合,直观地解决了行人轨迹时空复杂度问题,快速有效地分析海量轨迹的相关性.以分析Covid-19的传播过程为例,展示了结合行人重识别技术该系统在抗击疫情中的助力作用,并进行用户研究验证设计的有效性. 相似文献
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