Abstract This paper compares the self-starting ability of an unmodified modular Busemann intake (UBI), with a modified Busemann-based intake (MBI), where the modification is designed to promote intake starting. Both intakes are designed on the wavecatching principle to allow overboard spillage during the starting process. Both intakes are designed for a flight Mach number of 5.19. The theoretical exit Mach number of both intakes is 3.11. Unsteady CFD calculations show that the UBI does not start spontaneously at any flight Mach number. The MBI does start at Mach 3.1. For the MBI Busemann flow, the theoretical exit total pressure recovery is 0.937 with a startability index of 1.507. The modified internal contraction results in an exit flow with an elliptic oblique shock and some non-uniformity. The paper presents, a) how an intake is truncated, b) how streamline tracing is applied to design a wavecatcher flowpath, and c) how the strong shock principle is applied to design a startable intake.
Highlights A truncated method to obtain the modular Busemann intake is given. The MBI wavecatcher intake performs better self-starting ability than that of UBI. The flow structures of MBI and UBI are revealed during unstarted-started process. The exit flowpath of MBI contains an elliptic oblique shock with non-uniform flow.
Startability of truncated hypersonic wavecatcher intake
Acta Astronautica ; 198 ; 531-540
2022-06-30
10 pages
Article (Journal)
Electronic Resource
English
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