Abstract A summary is presented of research progress in the design and technology of hypersonic air intakes and variable-geometry turbine based combined cycle (TBCC) intakes. Development of hypersonic intakes has passed through three geometry variations: 1) intakes with Prandtl-Meyer flow, terminating at planarly symmetric flat, oblique shocks and bounded by sidewalls, 2) the novel modular wavecatcher intakes, based on axial flow; 3) diverterless supersonic intakes, integrated with a bump surface to displace the boundary layer. We describe development of the design method of the axisymmetric wavecatcher intake, covering the direct streamline tracing technique and methods of intake flowpath morphing. We characterize intakes on the basis of the flow-related, meaningful concepts of turning, convergence and deflection to distinguish the different fundamental and characterizing flows that form an intake flowpath. These concepts closely relate to intake capability and efficiency and so can be identified and ascribed as contributing factors to performance. Still-outstanding design challenges are highlighted. Development of the variable-geometry TBCC intake is reviewed. Classified by spatial layout, the TBCC intake includes tandem and parallel (over/under) flow paths that can be divided further into internal and external over/under TBCC intakes. The virtues and critical technologies of various variable-geometry TBCC intakes are reviewed and summarized and the capabilities of the over/under TBCC with an axial-flow-based wavecatcher intake are highlighted.

中文翻译：

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高超声速捕波器进气口和基于可变几何涡轮的联合循环发动机

摘要 综述了高超声速进气道和可变几何涡轮联合循环（TBCC）进气道设计与技术的研究进展。高超音速进气道的发展经历了三种几何变化：1）具有 Prandtl-Meyer 流的进气道，终止于平面对称的平坦斜激波并以侧壁为界，2）基于轴向流的新型模块化捕波器进气道；3) 无转向器的超音速进气道，与凹凸表面结合以取代边界层。我们描述了轴对称捕波器进气口设计方法的发展，涵盖了直接流线追踪技术和进气流路变形方法。我们根据与流量相关的有意义的转弯概念来描述进气口，会聚和偏转以区分形成进气流路的不同基本和特征流。这些概念与进气能力和效率密切相关，因此可以被识别并归因于影响性能的因素。突出了仍然突出的设计挑战。回顾了可变几何 TBCC 进气口的发展。按空间布局分类，TBCC 进水口包括串联和平行（上/下）流道，可进一步分为内部和外部上/下 TBCC 进水口。回顾和总结了各种可变几何 TBCC 进气口的优点和关键技术，并重点介绍了带有基于轴流的捕波器进气口的上/下 TBCC 进气口的能力。这些概念与进气能力和效率密切相关，因此可以被识别并归因于影响性能的因素。突出了仍然突出的设计挑战。回顾了可变几何 TBCC 进气口的发展。按空间布局分类，TBCC 进水口包括串联和平行（上/下）流道，可进一步分为内部和外部上/下 TBCC 进水口。回顾和总结了各种可变几何 TBCC 进气口的优点和关键技术，并重点介绍了带有基于轴流的捕波器进气口的上/下 TBCC 进气口的能力。这些概念与进气能力和效率密切相关，因此可以被识别并归因于影响性能的因素。突出了仍然突出的设计挑战。回顾了可变几何 TBCC 进气口的发展。按空间布局分类，TBCC 进水口包括串联和平行（上/下）流道，可进一步分为内部和外部上/下 TBCC 进水口。回顾和总结了各种可变几何 TBCC 进气口的优点和关键技术，并重点介绍了带有基于轴流的捕波器进气口的上/下 TBCC 进气口的能力。回顾了可变几何 TBCC 进气口的发展。按空间布局分类，TBCC 进水口包括串联和平行（上/下）流道，可进一步分为内部和外部上/下 TBCC 进水口。回顾和总结了各种可变几何 TBCC 进气口的优点和关键技术，并重点介绍了带有基于轴流的捕波器进气口的上/下 TBCC 进气口的能力。回顾了可变几何 TBCC 进气口的发展。按空间布局分类，TBCC 进水口包括串联和平行（上/下）流道，可进一步分为内部和外部上/下 TBCC 进水口。回顾和总结了各种可变几何 TBCC 进气口的优点和关键技术，并重点介绍了带有基于轴流的捕波器进气口的上/下 TBCC 进气口的能力。