EXPERIMENTAL DETERMINATION OF PITCHING MOMENT AND DAMPING COEFFICIENTS OF A CONE IN LOW DENSITY, HYPERSONIC FLOW
CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH
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Values of stability derivatives were determined experimentally for cones with semi-vertex angles of 45 degrees and 9 degrees. The results were compared with theoretical estimates and with other experimental data. The function of angle of attack was found to be positive, indicating negative damping. The influence of viscous effects upon these results is discussed. The experiment was conducted with freely oscillating models in hypersonic, low density flow, and was one of the first dynamic stability tests performed under these flow conditions. The instability is a marked deviation from the ordinary assumption of positive stability and certainly warrants further study and investigation. The cause of the instability remains undetermined the effects of viscous flow and shedding of vortices is discussed in this connection.
- Theoretical Mathematics