Numerical study of external burning flowfieldsThis paper demonstrates the successful application of CFD to modeling an external burning flowfield. The study used the 2D, 3D, and PNS versions of the SPARK code. Various grids, boundary conditions, and ignition methodologies have been employed. Flameholding was achieved through the use of a subsonic outflow condition and a hot block located behind the step to ignite the fuel. Since the resulting burning produces a large subsonic region downstream of the cowl, this entire surface can be pressurized to the level of the back pressure. An evaluation of interactions between the ramjet exhaust and the external burning products demonstrate the complexity of this design issue. Ths code is now capable of evaluating the external burning effectiveness for flight vehicles using simple injector schemes, and the methodology can be readily applied to other external burning designs.
Document ID
19910059600
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bittner, Robert D. (NASA Langley Research Center; Analytical Services and Materials, Inc. Hampton, VA, United States)
Mcclinton, Charles R. (NASA Langley Research Center Hampton, VA, United States)