A Study of the Modal Response Approach to Patterned Ablation Including Experiment Definition.
Abstract
Patterned ablation is hypothesized to be caused by a resonance or tuning response of the boundary layer to small disturbances originating at the wall from surface irregularities. An inviscid linear theoretical approach has been developed which approximates the boundary layer by many layers of uniform compressible flow and computes the pressure response at the wall. Using this, together with a simplified analysis of the ablation process, a mechanism for pattern geometry selection is shown. In addition, a second more rigorous theoretical approach is developed which treats the effects due to viscosity, turbulence and mass injection. Finally an experimental program, consisting of a series of gas-dynamically scaled ablative tests on geometrically similar cones, is proposed in order to determine if patterns can be produced due to purely gas dynamic phenomena. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0872901
Entities
People
- Coleman Dup. Donaldson
- Peter Conrad
- Richard Snedeker