This study explores the efficiency of streamline-tracing intake in scramjets within the hypersonic domain, where the Mach number () exceeds five. Focusing on a rectangular-to-elliptical shape transition intake following Busemann streamlines with a contraction ratio of 4.67, tailored for 7.1, this study innovates beyond traditional design method, employing numerical simulations to interpolate iso- points and shape the leading edge of the intake to enhance the performance. Three distinct leading-edge designs—using a sinusoidal function to closely track all iso- points, a convex second-order polynomial to bolster compression and mass flow, and a concave polynomial to widen the starting envelope—were conceptualized. The research included experiments with 0.06 scaled models for validation and performance assessments of full-scale intakes using three-dimensional viscous simulations. Key performance metrics, such as the pressure ratio, total pressure recovery, mass flow rate, and exit , were evaluated to reveal the capability of all three intake designs to operate effectively over a broad range (3–7). A key finding of this study is the ability to selectively enhance either the compression capability or the total pressure recovery by strategically designing the leading edge of the intake through interpolation methods. This study underscores the importance of using numerical simulation results in the notching process as an effective design strategy to handle a wide range of off-design conditions with fixed geometry and achieve performance improvements in scramjet intakes.

中文翻译：

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矩形到椭圆形过渡进气口，具有多种前沿性能，可增强性能

这项研究探讨了超燃冲压发动机在马赫数 () 超过 5 的高超音速域内流线追踪进气的效率。本研究重点关注收缩比为 4.67 的 Busemann 流线的矩形到椭圆形过渡进气口，专为 7.1 定制，超越了传统的设计方法，采用数值模拟来插值等值点并将进气口前缘塑造为增强性能。概念化了三种不同的前沿设计——使用正弦函数来密切跟踪所有等值点，使用凸二阶多项式来增强压缩和质量流，以及使用凹多项式来加宽起始包络线。该研究包括使用 0.06 比例模型进行实验，使用三维粘性模拟对全尺寸进气进行验证和性能评估。对压力比、总压恢复、质量流量和出口等关键性能指标进行了评估，以揭示所有三种进气设计在广泛范围内有效运行的能力 (3-7)。这项研究的一个重要发现是，通过插值方法策略性地设计进气口的前缘，能够选择性地增强压缩能力或总压恢复。这项研究强调了在切口过程中使用数值模拟结果作为有效设计策略的重要性，以处理具有固定几何形状的各种非设计条件并实现超燃冲压发动机进气道的性能改进。