Unsteady gun-barrel boundary-layer calculations
Conference
·
OSTI ID:5675283
The paper describes current progress in the calculation of nonsteady boundary layers involved in internal flow situations to determine the dominant mechanisms of erosion. A time-dependent description of the viscous (laminar and turbulent) layer is formulated, and numerical solutions are obtained by application of a factored ADI scheme. The conservation equations in the alternate-sweep form are then solved under prescribed (transient and streamwise varying) core-flow conditions. Verification of the method is made by comparing with available previous analyses, with favorable agreement. Calculations of the compressible, turbulent flow cases demonstrate strongly nonsimilar flow characteristics, suggesting that the high heat flux at the wall due to turbulence and the changing core conditions may in time cause severe temperature rise at the wall and may produce environments conducive to melting, ablation and erosion of the surface itself.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5675283
- Report Number(s):
- UCRL-83075; CONF-800308-2
- Country of Publication:
- United States
- Language:
- English
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