Turbulent boundary layer thermochemical attack on coated walls
Conference
·
OSTI ID:5383408
Recent theoretical predictions of turbulent forced convection heat transfer in erosive-corrosive gun tube propellant particle laden flow are extended for consideration of gas phase to solid surface reaction kinetics. Particle loading and boundary layer particle dispersal were shown, in these predictions, to directly inhibit kinetic and turbulent eddy diffusion processes and so to reduce the intensity of the turbulence in the boundary layer which forms adjacent to solid boundaries. The net predicted result is a significant reduction in erosive/corrosive wall heat transfer and a consequent significant reduction in wall material erosion. These predictions were confirmed by comparison with experimental observations, some of which are also summarized. However, the primary attention here is placed on combined gas phase and gas/surface combustion reaction influences with gun steel and refractory metal wall coatings in the presence of dispersed phase solid particles. Surface heating, substrate bond failure, crack initiation, and rate-dependent surface material loss are also considered.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5383408
- Report Number(s):
- UCRL-89369; CONF-840250-1; ON: DE84005892
- Country of Publication:
- United States
- Language:
- English
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