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NUMERICAL RESEARCH ON THE FLOW FIELD AND PERFORMANCE OF A RAM-ROTOR AND A SCRAMPRESSOR

机译:RAM转子和曲折的流场和性能的数值研究

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The design methods of typical supersonic aircraft intakes and shock wave compression technology have been applied to ram-rotor, a new attractive compression system. A ram-rotor is a typical structure including the compression ramp, the throat and the subsonic diffuser; a scrampressor is similar to ram-rotor, the only different is that scrampressor has no subsonic diffuser. Base on the preparatory work, it has been found that these two structures have different advantages respectively. So, in this paper, the three dimensional Reynolds-averaged Navier-Stokes equations and the Spalart-Allmaras turbulent model are used to simulate numerically the flow field of the ram-rotor and the scrampressor at the design and at the off-design conditions. The back pressure and rotational speed are mainly considered which may affect the flow field and the total performance. It has been found that back pressure can not have influence on the flow field before the throat outlet obviously. With increasing of the back pressure, the position of the flow separation zone and shock train move forwards to the inlet. The rotational speed changes the shock wave structure of the ram-rotor and scrampressor evidently. With the rotational speed increasing, each shock wave moves to the outlet and the shock wave number decreases. The ram-rotor and scrampressor structure is similar, except the ram-rotor flow structure has a large flow separation zone after the throat outlet. The compression capability of the ram-rotor is higher than that of the scrampressor. The total performance of the scrampressor is better than the ram-rotor.
机译:典型的超音速飞机摄入和冲击波压缩技术的设计方法已应用于Ram-Rovor,一种新的有吸引力的压缩系统。 RAM转子是典型的结构,包括压缩斜坡,喉部和亚音速漫射器;曲柄器类似于RAM转子,唯一的不同是曲柄压缩机没有亚音速扩散器。基于准备工作,已经发现这两个结构分别具有不同的优点。因此,在本文中,三维雷诺平均天线和Spalart-Allmaras湍流模型用于在设计和非设计条件下以数字方式模拟RAM转子的流场和曲折。背压和转速主要被认为是影响流场和总性能。已经发现,背压不能在喉部出口明显地对流场产生影响。随着背压的增加,流动分离区和冲击火车的位置向前移动到入口。转速显然地改变了RAM转子和曲折的冲击波结构。随着旋转速度的增加,每个冲击波移动到出口并且冲击波数减小。除了ram转子流动结构之外,ram转子和曲压器结构类似于喉部出口后具有大的流量分离区。 RAM转子的压缩能力高于曲柄压缩机的压缩能力。曲柄器的总性能优于RAM转子。

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