LOW DENSITY HIGH TEMPERATURE GAS DYNAMICS.
Final scientific rept. 1 Nov 68-31 Oct 69,
VON KARMAN INST FOR FLUID DYNAMICS RHODE-SAINT-GENESE (BELGIUM)
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Surface pressures on a flat plate with sharp leading edge were measured in a M 1.5 monatomic gas flow. The results were in essential agreement with those recorded for a diatomic gas, but differed quantitatively from a recent theory based on a discrete ordinate solution of the BGK equation. The modulated hot-wire probe was proven conclusively to provide a measurement of local mass flux in a hypersonic flow. Surveys performed in a low density free jet showed very clearly the initial disturbance produced by the thick surrounding shock structure. The upstream influence of a sharp flat plate was measured with the modulated hot wire probe. The disturbance field was symmetrical about the leading edge and extended upstream for approximately three mean-free-paths based on a body-free stream collision. Thermographic phosphors were determined to exhibit a sensitivity of 8 change in output light intensity per deg C and to have an equivalent noise figure of 0.1C thus they will be suitable for measuring local surface temperature at sharp leading edges. Author
- Fluid Mechanics