Shortened flowfield design for streamline-traced intakes

초록

A new axisymmetric flowfield was proposed and coined as internal conical flow kurz (ICFK), in which two solutions of the Taylor-Maccoll equation, internal conical flow A (ICFA) and truncated Busemann streamline, were stitched under a new condition. The integration of ICFA and Busemann streamlines has recently drawn the attention of many, given its capability of producing superior axisymmetric parent flowfields for hypersonic inlet design as compared to conventional Busemann streamlines. However, due to a discrepancy in certain flow variables at the ICFA-Busemann interface, large supersonic expansion zones could be seen in the preceding design theories, degrading overall flow uniformity. ICFK successfully mitigated this issue by keeping flow angles continuous while simultaneously having a shorter axial length as well as higher area contraction than any other contour. Through inviscid and viscous simulations, ICFK demonstrated its capability to yield higher compression, smaller expansion zone, and lower isolator Mach number as compared to other variants of stitched ICFA-Busemann contours, such as internal conical flow C or internal conical flow M, at a slight cost of efficiency. These improvements indicate that ICFK could be a promising axisymmetric parent flowfield capable of deriving streamline-traced intakes with more favorable performance parameters.

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