A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compressio...A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compression ramp,the throat and the subsonic diffuser.The design Mach number of the flow-path was based on the averaged relative Mach number,regardless of the change of incoming Mach number along radial direction of the flow-path.Then,the flowfield of the designed flow-path was simulated numerically with computational fluid dynamics software at design point.The purpose of simulation was to obtain the details of the flowfield,including the structure of the shock wave system,position of flow separation zone,and so on.The performance of the ram-rotor was also evaluated.The numerical results show the structure of the shock wave system in the flow-path is similar to that in the supersonic intake.To improve the overall performance of the ram-rotor,the reasonable compromise between the total pressure ratio and the isentropic adiabatic efficiency should be reached.The structure optimization of the flow-path and the configuration of the shock wave system have great influence on the performance of the ram-rotor.展开更多
液压集成块内部流道是液压系统承载压力、传递动力的重要载体,然而其受限于减材制造,导致体积重量大、工艺孔多、压力损失较大等问题,严重影响移动装备液压系统功重比。针对上述问题,提出基于快速扩展随机树(Rapidexploration random tr...液压集成块内部流道是液压系统承载压力、传递动力的重要载体,然而其受限于减材制造,导致体积重量大、工艺孔多、压力损失较大等问题,严重影响移动装备液压系统功重比。针对上述问题,提出基于快速扩展随机树(Rapidexploration random tree,RRT)算法与贪心算法的面向增材制造成型的多向异形连接区域最短流道路径设计方法,然后采用伴随优化方法对最短路径流道进行基于压力损失的形状敏感度优化,最后使用选区激光熔融技术成形低压损最短路径流道,并搭建压力损失测试试验台进行试验研究。结果发现伴随优化后的某电静液驱动执行器(Electro-hydrostatic actuator,EHA)集成块流道轴线路径缩短了49.6%,且油液流动顺畅,流道内部涡结构范围与强度较小;同时,试验表明伴随优化后的流道在不同通流状态下,平均压损降低了75.04%。研究成果将为增材制造成形的液压集成块流道优化设计提供新思路。展开更多
基金Supported by National High-tech R&D Program(2007AA05Z255)
文摘A kind of three-dimensional flow-path of the ram-rotor was designed in this paper according to the design method of the typical supersonic intake of aircraft and missiles,especially the design method of the compression ramp,the throat and the subsonic diffuser.The design Mach number of the flow-path was based on the averaged relative Mach number,regardless of the change of incoming Mach number along radial direction of the flow-path.Then,the flowfield of the designed flow-path was simulated numerically with computational fluid dynamics software at design point.The purpose of simulation was to obtain the details of the flowfield,including the structure of the shock wave system,position of flow separation zone,and so on.The performance of the ram-rotor was also evaluated.The numerical results show the structure of the shock wave system in the flow-path is similar to that in the supersonic intake.To improve the overall performance of the ram-rotor,the reasonable compromise between the total pressure ratio and the isentropic adiabatic efficiency should be reached.The structure optimization of the flow-path and the configuration of the shock wave system have great influence on the performance of the ram-rotor.
文摘液压集成块内部流道是液压系统承载压力、传递动力的重要载体,然而其受限于减材制造,导致体积重量大、工艺孔多、压力损失较大等问题,严重影响移动装备液压系统功重比。针对上述问题,提出基于快速扩展随机树(Rapidexploration random tree,RRT)算法与贪心算法的面向增材制造成型的多向异形连接区域最短流道路径设计方法,然后采用伴随优化方法对最短路径流道进行基于压力损失的形状敏感度优化,最后使用选区激光熔融技术成形低压损最短路径流道,并搭建压力损失测试试验台进行试验研究。结果发现伴随优化后的某电静液驱动执行器(Electro-hydrostatic actuator,EHA)集成块流道轴线路径缩短了49.6%,且油液流动顺畅,流道内部涡结构范围与强度较小;同时,试验表明伴随优化后的流道在不同通流状态下,平均压损降低了75.04%。研究成果将为增材制造成形的液压集成块流道优化设计提供新思路。
