Daegi YEOM, Hyeonseo LEE, Seongkyun IM
DOI Number: XXX-YYY-ZZZ
Conference number: HiSST2024-00236
The on- and off-design performances of three rectangular-to-elliptical shape transition (REST) with diverse leading-edge profiles were examined numerically. In the design and analysis of REST intakes, particular attention was given to the notching process, a critical post-processing step that significantly influences the overall flow characteristics and performance of these intakes. The designated Mach number (Ma) for the study was fixed at 7, and all intakes were designed with an approximately 10 contraction ratio (CR), a uniform truncation angle of 3°, and a notching percentage of 2%. The first intake, denoted as Type A, was characterized by a leading-edge shaped according to a sinusoidal function. In contrast, the second and third intakes employed quadratic functions for leading-edge shaping, with convex and concave fitting lines, respectively. Computational fluid dynamics (CFD) simulations were conducted to assess the performance of each REST intake, with a focus on key parameters including total pressure recovery rate, pressure ratio, inlet exit Ma, and captured mass flow rate. The results of this study indicate that the second type of REST intake exhibited notable advantages in achieving a high degree of compression, despite the restricted starting range to Ma 5. Conversely, the third type of REST intake demonstrated the ability to extend the operational range to a lower starting limit of Ma 4.5. These results shed light on the potential benefits and limitations of various leading-edge profiles in REST intakes, thereby contributing to the advancement of intake design for scramjet propulsion systems.