冰晶粒子运动过程中的相变特性

针对冰晶在温暖环境下运动时固液汽耦合的相变现象，基于欧拉法建立了冰晶粒子的运动相变模型和计算方法。计算了冰晶粒子在强迫对流环境下的融化相变过程，与实验结果对比验证了运动相变模型和计算方法的准确性。针对NACA0012翼型计算了冰晶绕流运动时的热力学特性，得到了冰晶粒子到达撞击表面时的融化状态与收集系数。研究了冰晶粒径大小、初始球形度、气流相对湿度和温度对运动相变的影响。结果表明：冰晶粒子运动相变模型可以有效地评估冰晶结冰风险，冰晶粒子的融化速率主要取决于粒子直径、球形度、气流温度、湿度等因素，环境温度为288 K时冰晶粒子的融化时间为27.5 s，而相同条件下环境温度为302 K时的融化时间仅有5.2 s。     

Collaborative manufacturing technologies of structure shape and surface integrity for complex thin-walled components of aero-engine: Status,challenge and tendency

Presently, the service performance of new-generation high-tech equipment is directly affected by the manufacturing quality of complex thin-walled components. A high-efficiency and quality manufacturing of these complex thin-walled components creates a bottleneck that needs to be solved urgently in machinery manufacturing. To address this problem, the collaborative manufacturing of structure shape and surface integrity has emerged as a new process that can shorten processing cycles, improve machining qualities, and reduce costs. This paper summarises the research status on the material removal mechanism, precision control of structure shape, machined surface integrity control and intelligent process control technology of complex thin-walled components. Numerous solutions and technical approaches are then put forward to solve the critical problems in the high-performance manufacturing of complex thin-wall components. The development status, challenge and tendency of collaborative manufacturing technologies in the high-efficiency and quality manufacturing of complex thin-wall components is also discussed.     

检查性反潜时声纳浮标阵阵型优化

存总结检查性反潜要求与特点的基础上，分析了检查性反潜时声纳浮标阵的主要阵型，建立了声纳浮标阵作战效能的仿真模型，并在想定条件下对典型声纳浮标阵的搜索效能进行了仿真研究。比较、分析仿真结果，提出了检查性反潜时声纳浮标阵阵型的优化结果.