THE NEAR WAKE OF A WEDGE,
Abstract
An analytical model of the two-dimensional laminar near wake is described. All relevant physical features of the flow, including the boundary layer expansion at the shoulder, free shear layers, recirculation regions and recompression region are included. A tractable problem is formulated by matching approximate solutions for each of these regions along mutual boundaries. A set of coupled algebraic equations is derived, and numerical results obtained for the conditions of a wind tunnel wedge experiment. Satisfactory agreement is obtained between the measured and theoretical variation of base pressure with Reynolds number. Additional computations are carried out for a series of wedges of different length, apex angle and wall temperature. The variation of base pressure, wake angle and neck enthalpy ratio with altitude is obtained for these bodies. It is shown that the near wake dimensions scale approximately with body size, and that the neck enthalpy ratio has a significant variation with body size, wall temperature and altitude. The effect of free-stream velocity on the neck enthalpy ratio is seen to be relatively unimportant, however. A number of extensions of the first-order model are suggested. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1964
- Accession Number
- AD0609577
Entities
People
- R. Weiss