Modeling study is performed to reveal the special features of the entrainment of ambient air into turbulent air jets.
本文采用数值模拟方法,研究了湍流空气射流对环境空气的引射特性,包括等温射流和非等温射流情形。
Effects of configuration and secondary combustion on RBCC thrust in ejecting mode;
构型及二次燃烧对RBCC引射模态推力性能的影响
Both advantages of rocket engine and air-breathing engine are integrated into one kind of propulsion system,called Rocket-Based-Combined-Cycle (RBCC),which has multiple operating woke modes,including ejecting,subsonic combustion,supersonic combustion and rocket mode,with each mode operating at varying flying stage.
火箭基组合动力循环(RBCC，Rocket Based Combined Cycle)将传统的火箭发动机和吸气式发动机的优点集中组合到一个具有多种工作模态(包括引射、亚燃、超燃及火箭模态)的发动机里，在不同的飞行阶段启用不同的工作模态，因此具有大幅提高航天推进系统经济性与高效性的潜在优势，并可能发展成为下一代单级可重复使用航天器以及高超声速导弹武器的动力系统。
The Chen-Kim modified k-ε model of turbulence and the co-located grid, SIMPLEC are used to the numerical analysis of the mixing flow of the lobed ejector with a double-wall diffuser by using of the great viscosity for the lobe.
对波瓣及双层壁,采用大粘性的方法解决流固耦合,计算结果表明:在双层壁间有外界冷气流被引射进入,形成了壁面的冷却气流,相对单层壁扩压器,双层壁扩压器的壁面温度明显降低;自波瓣出口截面沿流向产生的环流速度场,强化了主次流的掺混,速度分布渐趋均匀。
In order to avoid the divergence as the non orthogonality of the lobe, the Chen Kim modified k ε model of turbulence and the co located grid, SIMPLEC, are used in the numerical analysis of the mixing flow of the lobed ejector with a double wall diffuser by using the great viscosity for the lobe.
计算结果表明 :在双层壁间有外界冷气流被引射进入 ,形成了壁面的冷却气流 ;自波瓣出口截面沿流向产生的环流速度场 ,强化了主次流的掺混 ,速度分布渐趋均匀。
The ejectors technique was successfully utilized in the key ammonia distilling in coking waste water treatment,by means of technical innovations,bringing about remarkable economic,social and environment-protec- tion returns.
通过技术创新,将引射技术成功应用在焦化废水处理的蒸氨关键工艺中,取得了客观的经济效益和社会环保效益。