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<p>Scramjet (supersonic combustion ramjet) propulsion offers a transformative approach to hypersonic flight by enabling airbreathing operation at speeds exceeding Mach 5. Central to scramjet performance is the inlet, which must efficiently compress high-speed airflow without rotating components while minimizing total pressure losses and avoiding flow separation. This review presents a comprehensive analysis of scramjet inlet design strategies, covering external, internal, and mixed compression schemes, flow control mechanisms, and geometric configurations including 2D, 3D, and axisymmetric layouts. Experimental and CFD studies are critically reviewed, highlighting key challenges such as shock–boundary-layer interaction, starting and unstart behavior, wind shear sensitivity, and thermal management. The effectiveness of advanced techniques like boundary-layer bleed, variable-geometry inlets, and adaptive flow control is evaluated. Case studies of the NASA X-43A and HyShot programs illustrate real-world applications and validation of scramjet inlet concepts. Emerging trends, including machine learning-assisted optimization and global research collaborations, point toward the future of hypersonic propulsion. This review serves as a foundational resource for researchers and engineers aiming to design robust and efficient scramjet inlets for next-generation high-speed aerospace systems.</p>

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Scramjet inlets: a comprehensive review of design approaches, flow control, and hypersonic challenges

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Dinesh Kumar Bajaj,
  • Shezan Ghamat,
  • Rahul Makade,
  • Ashish Vashishtha,
  • Devabrata Sahoo

摘要

Scramjet (supersonic combustion ramjet) propulsion offers a transformative approach to hypersonic flight by enabling airbreathing operation at speeds exceeding Mach 5. Central to scramjet performance is the inlet, which must efficiently compress high-speed airflow without rotating components while minimizing total pressure losses and avoiding flow separation. This review presents a comprehensive analysis of scramjet inlet design strategies, covering external, internal, and mixed compression schemes, flow control mechanisms, and geometric configurations including 2D, 3D, and axisymmetric layouts. Experimental and CFD studies are critically reviewed, highlighting key challenges such as shock–boundary-layer interaction, starting and unstart behavior, wind shear sensitivity, and thermal management. The effectiveness of advanced techniques like boundary-layer bleed, variable-geometry inlets, and adaptive flow control is evaluated. Case studies of the NASA X-43A and HyShot programs illustrate real-world applications and validation of scramjet inlet concepts. Emerging trends, including machine learning-assisted optimization and global research collaborations, point toward the future of hypersonic propulsion. This review serves as a foundational resource for researchers and engineers aiming to design robust and efficient scramjet inlets for next-generation high-speed aerospace systems.