Tim Roos, Adrian S. Pudsey, Hideaki Ogawa, Mathew G. Bricalli

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-14

Cavities have been widely studied for mixing, flameholding and ignition enhancement in scramjet combustors. When used for this purpose, the cavity is commonly placed downstream of the fuel injector and
the cavity flowfield is unsteady in nature. Recently, a novel arrangement where the cavity placed upstream of the injector has been proposed for mixing enhancement, and there is some evidence that the
associated flowfield is steady. The present study compares Reynolds-averaged Navier-Stokes (RANS)
and unsteady RANS (URANS) simulations of the upstream cavity arrangement to assess the stability
of the flowfield and the ability of RANS to capture the one-dimensional performance of the flowfield.
It is found that the cavity flowfield is steady in nature, because the primary mechanism that drives
self-sustained oscillation in conventional cavity flow is absent in the upstream cavity arrangement. Both
simulation approaches also result in near identical predictions of key performance variables and flowfield
behaviour, demonstrating that one-dimensional mixing performance and the flowfield characteristics of
the upstream cavity geometry can be adequately captured using RANS.

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In Categories: 1.Events, HiSST 2022, Hypersonic Fundamentals and History
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