AN EXPERIMENTAL STUDY OF REAL GAS EFFECTS ON SHOCK DETACHMENT DISTANCES AND SHOCK SHAPES FOR A FAMILY OF BLUNT AXISYMMETRIC BODIES
Abstract
Shock shapes and detachment distances for spherical nosed bodies are presented and analyzed. The experimental data were obtained by testing the models in an arc-driven shock tube facility which produces a high enthalpy supersonic flow behind the traveling normal shock. The free-stream conditions with respect to the model were such that the equilibrium density ratio across the bow shock and the free-stream Mach number vary as 3.1 < or = k < or = 7.2 and 2.1 <or = M2 < or = 3.54, respectively. The stagnation enthalpy range for the tests (2,000-31,000 BTU/lb(m)) allowed for free-stream dissociation and ionization levels of up to 88.0 per cent and 25.0 per cent, respectively. The handling of the data is somewhat different than usual in the type of quantities needed in the correlation procedure. It is demonstrated that the density ratio across the bow shock is the important parameter for correlating the nose region shock shapes since this produces agreement between the real gas data and perfect gas data. It is also demonstrated that detachment distance may be dependent on the level of free-stream dissociation while the nose region shock shape shows no dependence whatsoever on the degree of gas dissociation or ionization ahead of or behind the bow shock.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1964
- Accession Number
- AD0608869
Entities
People
- Bruce C. Graber
Organizations
- Ohio State University